Yaskawa FP605 Drive – Drivefault

Yaskawa FP605 Drive Fault Codes:

Fault Code and Meaning	Cause and Remedy
AUXFB PI Aux Feedback Level Loss	Cause: The analog input from the terminal set for PI Auxiliary Control Feedback Level [H3-xx = 27] is more than 21 mA or less than 3 mA for longer than 1 s. Remedy: Repair transducer or wiring. Do a Fault Reset to clear the fault.
bAT Keypad Battery Low Voltage	Cause: The keypad battery voltage is low. Remedy: Replace the keypad battery. Note: Use o4-24 [bAT Detection Selection] to enable/disable bAT detection.
bCE Bluetooth Communication Fault	Cause: The smartphone or tablet with DriveWizard Mobile or DriveWizard installed is too far from the keypad. Radio waves from a different device are causing interference. Remedy: Use the smartphone or tablet 10 m (32.8 ft) or nearer to the keypad. Make sure that no device around the keypad uses the same radio bandwidth (2400 MHz to 2480 MHz). Do a Fault Reset to clear the fault.
bUS Option Communication Error	Cause: The drive did not receive a signal from the controller. Communications cable wiring is incorrect, disconnected, or short-circuited. Electrical interference caused a communication data error. The option is incorrectly installed or damaged. Remedy: Correct wiring errors and repair short circuits. Replace defective cables. Examine control/main circuit lines and ground wiring to decrease interference. Install a noise filter on the input side. Correctly install the option to the drive. If fault continues, replace the option.
CE Modbus Communication Error	Cause: Communications cable wiring is incorrect, short-circuited, or not connected. Electrical interference caused a communication data error. Remedy: Correct wiring errors and repair short circuits. Replace defective communications cables. Check magnetic contactors for interference; use Surge Protective Device if necessary. Use recommended shielded lines and ground the shield properly. Separate communication wiring from drive power lines.
CoF Current Offset Fault	Cause: The drive starts operation while the induced voltage stays in the motor (during coasting to a stop or after fast deceleration). A drive hardware problem occurred. Remedy: Make a sequence that does not restart operation when induced voltage stays in the motor. Set b3-01 = 1 [Speed Search at Start Selection = Enabled]. Do a Fault Reset to clear the fault or de-energize the drive. If the fault stays, replace the drive.
CPF00 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF01 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF02 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF03 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF06 Control Circuit Error (EEPROM memory Data Error)	Cause: The drive power supply was de-energized while a communication option entered a parameter Write command. An EEPROM peripheral circuit error occurred. Remedy: Set A1-03 = 2220, 3330 to initialize the drive. Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF07 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF08 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF11 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF12 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF13 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF14 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF16 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF17 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF18 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF19 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF20 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF21 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF22 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF23 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF24 Control Circuit Error (Drive Unit Signal Fault)	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF26 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF27 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF28 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF29 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF30 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF31 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF32 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF33 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive. For information about replacing the control board, contact Yaskawa or your nearest sales representative.
CPF34 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF35 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF36 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF37 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF38 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
CPF39 Control Circuit Error	Cause: A drive hardware problem occurred. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive.
dEv Speed Deviation	Cause: The load is too heavy; Acceleration/deceleration times are set too short; The dEv detection level settings are incorrect; The load is locked up; The holding brake is stopping the motor. Remedy: Decrease the load. Increase the values set in C1-01 to C1-04 [Acceleration/Deceleration Time]. Adjust F1-10 [Speed Deviation Detection Level] and F1-11 [Speed Deviation Detect Delay Time]. Examine the machine. Release the holding brake.
DIFF Differential Feedback Exceeded	Cause: The difference between the PID Feedback and Differential Level Source is more than the level set in Y4-18 for the time set in Y4-19. Remedy: Replace the feedback transducer or transducers. Make sure that the settings of Y4-18 [Differential Level] to Y4-20 [Differential Level Detection Sel] are correct.
dv7 Polarity Judge Timeout	Cause: There is a disconnection in the motor coil winding; The screws on the drive output terminals are loose. Remedy: Measure the motor line-to-line resistance and replace the motor if a coil is disconnected. Tighten the terminal screws to the correct tightening torque.
EF0 Option Card External Fault	Cause: The communication option received an external fault from the controller; A programming error occurred on the controller side. Remedy: Find the device that caused the external fault and remove the cause. Clear the external fault input from the controller. Examine the operation of the controller program.
EF1 External Fault (Terminal S1)	Cause: MFDI terminal S1 caused an external fault through an external device; The wiring is incorrect; External Fault parameters set incorrectly. Remedy: Find the device that caused the external fault and remove the cause. Clear the external fault input in the MFDI. Correctly connect the signal line to MFDI terminal S1. Correctly set the MFDI (H1-01).
EF2 External Fault (Terminal S2)	Cause: MFDI terminal S2 caused an external fault through an external device; The wiring is incorrect; External Fault parameters set incorrectly. Remedy: Find the device that caused the external fault and remove the cause. Clear the external fault input in the MFDI. Correctly connect the signal line to MFDI terminal S2. Correctly set the MFDI (H1-02).
EF3 External Fault (Terminal S3)	Cause: MFDI terminal S3 caused an external fault through an external device; The wiring is incorrect; External Fault parameters set incorrectly. Remedy: Find the device that caused the external fault and remove the cause. Clear the external fault input in the MFDI. Correctly connect the signal line to MFDI terminal S3. Correctly set the MFDI (H1-03).
EF4 External Fault (Terminal S4)	Cause: MFDI terminal S4 caused an external fault through an external device; The wiring is incorrect; External Fault parameters set incorrectly. Remedy: Find the device that caused the external fault and remove the cause. Clear the external fault input in the MFDI. Correctly connect the signal line to MFDI terminal S4. Correctly set the MFDI (H1-04).
EF5 External Fault (Terminal S5)	Cause: MFDI terminal S5 caused an external fault through an external device; The wiring is incorrect; External Fault parameters set incorrectly. Remedy: Find the device that caused the external fault and remove the cause. Clear the external fault input in the MFDI. Correctly connect the signal line to MFDI terminal S5. Correctly set the MFDI (H1-05).
EF6 External Fault (Terminal S6)	Cause: MFDI terminal S6 caused an external fault through an external device; The wiring is incorrect; External Fault parameters set incorrectly. Remedy: Find the device that caused the external fault and remove the cause. Clear the external fault input in the MFDI. Correctly connect the signal line to MFDI terminal S6. Correctly set the MFDI (H1-06).
EF7 External Fault (Terminal S7)	Cause: MFDI terminal S7 caused an external fault through an external device; The wiring is incorrect; External Fault parameters set incorrectly. Remedy: Find the device that caused the external fault and remove the cause. Clear the external fault input in the MFDI. Correctly connect the signal line to MFDI terminal S7. Correctly set the MFDI (H1-07).
EF8 External Fault (Terminal S8)	Cause: MFDI terminal S8 caused an external fault through an external device; The wiring is incorrect; External Fault parameters set incorrectly. Remedy: Find the device that caused the external fault and remove the cause. Clear the external fault input in the MFDI. Correctly connect the signal line to MFDI terminal S8. Correctly set the MFDI (H1-08).
Err EEPROM Write Error	Cause: There was a problem with the EEPROM hardware; Electrical interference corrupted the data while it was writing to the EEPROM. Remedy: Re-energize the drive. If the fault stays, replace the control board or the drive. Push ENTER Key. Set the parameters again.
FAn1 Drive Cooling Fan Fault	Cause: The cooling fan stopped operating correctly; The circulation fan is damaged. Remedy: Examine cooling fan operation. Re-energize the drive. Examine U4-03 and U4-04. If performance life expired or fan damaged, replace fan. Examine circulation fan operation.
FDBKL WIRE Break	Cause: The analog input from the terminal set for PID Feedback is more than 21mA or less than 3mA for longer than 1s. Remedy: Make sure that you install the PID feedback source and it operates correctly.
GF Ground Fault	Cause: Overheating caused damage to the motor/insulation; Main circuit cable contacting ground; Increase in stray capacitance; Problem with drive hardware. Remedy: Measure motor insulation resistance and replace motor if necessary. Examine motor main circuit cable for damage and repair. If wiring length > 100m, decrease carrier frequency. Decrease stray capacitance. Replace the control board or the drive.
HFB High Feedback Sensed	Cause: The feedback level is more than the level set in Y1-11 for the time set in Y1-12. Remedy: Decrease the feedback level less than Y1-11. Set Y1-11 and Y1-12 correctly.
HIAUX High PI Aux Feedback Level	Cause: PI Auxiliary Feedback is more than the level set in YF-12 for the time set in YF-13. Remedy: Decrease the PI Auxiliary Feedback level less than YF-12. Set YF-12 and YF-13 correctly.
HLCE High Level Communication Errors	Cause: Communication data error occurred between the option and the master drive when using Gateway function. Remedy: Examine the wiring between the option and the master drive and remove the cause of the fault.
HWL High Water Level	Cause: The digital input terminal set to High Water Level is activated, deactivated, or defective (depending on setting). Remedy: Decrease the water level. Adjust the terminal set to H1-xx = BC or 1BC.
LF Output Phase Loss	Cause: Motor main circuit cable disconnected; Disconnection in motor coil; Loose output terminal screws; Drive capacity mismatch; Using single-phase motor; Output transistor damaged. Remedy: Connect motor main circuit cable wiring. Correct wiring errors. Measure motor Line-to-Line Resistance and replace motor if coil is disconnected. Tighten terminal screws to correct torque. Examine drive capacity vs motor output. (Drive cannot operate single-phase motor). Re-energize drive. If fault stays, replace control board or drive.
LF2 Output Current Imbalance	Cause: Phase loss in wiring on output side; Loose terminal screws; Imbalance between three phases of PM motor impedance; Drive output circuit broken. Remedy: Examine for wiring errors or disconnected wires and repair. Tighten terminal screws to correct torque. Measure Line-to-Line Resistance and replace motor if necessary. Re-energize drive. If fault stays, replace control board or drive.
LFB Low Feedback Sensed	Cause: The feedback level is less than the level set in Y1-08 for the time set in Y1-09. Remedy: Increase the feedback level to more than Y1-08. Set Y1-08 and Y1-09 correctly.
LOAUX Low PI Aux Feedback Level	Cause: PI Auxiliary Feedback is less than the level set in YF-09 for the time set in YF-10. Remedy: Increase the PI Auxiliary Feedback level to be more than YF-09. Set YF-09 and YF-10 correctly.
LOP Loss of Prime	Cause: The drive used the Y1-18 [Prime Loss Detection Method] setting and measured a pump load that is less than the level set in Y1-19 for the time set in Y1-20, and the output frequency is Y1-21 or more. Remedy: Examine for a dry well, air in the system, or no water in the system. Use preferred priming method suggested by the pump manufacturer to restart the pump. When there is resistance in the pump, let the system pump water again. Set Y1-18 to Y1-21 correctly. Note: Do a Fault Reset to clear the fault.
LWL Low Water Level	Cause: The digital input terminal set to H1-xx = BB [Low Water Level] is activated/defective, or the terminal set to H1-xx = 1BB [!Low Water Level] is deactivated/defective. Remedy: Increase the water level. Adjust the terminal set to H1-xx = BB or 1BB.
NMS Setpoint Not Met	Cause: The feedback deviates from the setpoint at a level more than Y1-15 [Maximum Setpoint Difference] for the time set in Y1-16. Remedy: Examine for a blocked impeller, over cycling, or broken pipe. Set Y1-15 and Y1-16 correctly.
nSE Node Setup Error	Cause: The drive received a Run command while the Node Setup function was active. Remedy: Stop the drive when the Node Setup function is in use.
oC Overcurrent	Cause: The load is too large. Overheating caused damage to the motor or motor insulation is not satisfactory. Short circuit or ground fault on the output side (cables or motor). Acceleration time is too short. The drive is operating a specialized motor or a motor larger than the drive’s rating. A magnetic contactor was switched at the output. Remedy: Measure current flowing into the motor. Replace drive with larger capacity if necessary. Measure motor insulation resistance; replace motor if insulation is unserviceable. Check motor main circuit cable for short circuits or ground faults. Repair or replace cable. Increase Acceleration Times (C1-01/C1-03) or S-Curve Characteristics (C2-01 to C2-04). Ensure motor nameplate rating does not exceed drive rating. Set operation sequence to not switch the magnetic contactor while the drive is outputting voltage.
OD Output Disconnect	Cause: The output circuit between the drive and the motor is open, and the drive output current is less than 5% of E2-01. Remedy: Close the disconnected output circuit between the drive and the motor.
oFA00 Option Not Compatible with Port	Cause: The option connected to connector CN5-A is not compatible. This may occur if DIP switches on JOHB-SMP3 are not set to a valid protocol. Remedy: Connect the option to the correct connector. Remove power, wait for charge light to go off, then set DIP switches on the JOHB-SMP3 to the desired protocol.
oFA01 Option Fault/Connection Error	Cause: The option card connected to connector CN5-A is not compatible. Remedy: De-energize the drive. Refer to the option card manual and correctly connect the option card to the connector on the drive.
oFA02 Duplicate Options	Cause: The same option cards or the same type of option cards are connected to connectors CN5-A and B. Remedy: Connect the option card to the correct connector.
oFA03 Diagnostic Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA04 Flash Write Mode	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA05 Option A/D Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA06 Option Communication Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA10 Option RAM Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA11 Option Ope Mode Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA12 Drive Receive CRC Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA13 Drive Receive Frame Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA14 Drive Receive Abort Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA15 Option Receive CRC Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA16 Option Receive Frame Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA17 Option Receive Abort Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA30 COM ID Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA31 Type Code Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA32 SUM Check Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA33 Option Receive Time Over	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA34 Memobus Time Over	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA35 Drive Receive Time Over 1	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA36 CI Check Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA37 Drive Receive Time Over 2	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA38 Control Reference Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA39 Drive Receive Time Over 3	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card.
oFA40 CtrlResSel 1Err	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFA41 Drive Receive Time Over 4	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFA42 CtrlResSel 2Err	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFA43 Drive Receive Time Over 5	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFb00 Option Not Compatible with Port	Cause: The option connected to connector CN5-B is not compatible. Remedy: Connect the option to the correct connector. Note: The communication options cannot connect to connector CN5-B. Do a Fault Reset to clear the fault.
oFb01 Option Fault/Connection Error	Cause: The option card connected to connector CN5-B was changed during operation. Remedy: De-energize the drive. Refer to the option card manual and correctly connect the option card to the connector on the drive. Note: Do a Fault Reset to clear the fault.
oFb02 Duplicate Options	Cause: The same option cards or the same type of option cards are connected to connectors CN5-A and B. Remedy: Connect the option card to the correct connector. Note: Do a Fault Reset to clear the fault.
oFb03 Diagnostic Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFb04 Flash Write Mode	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFb05 Option A/D Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFb06 Option Communication Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFb10 Option RAM Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFb11 Option Ope Mode Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFb12 Drive Receive CRC Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFb13 Drive Receive Frame Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFb14 Drive Receive Abort Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFb15 Option Receive CRC Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFb16 Option Receive Frame Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oFb17 Option Receive Abort Error	Cause: A fault occurred in the option card. Remedy: De-energize the drive. Make sure that the option card is correctly connected to the connector. If the problem continues, replace the option card. Note: Do a Fault Reset to clear the fault.
oH Heatsink Overheat	Cause: The ambient temperature is high and the heatsink temperature of the drive is more than the value set in L8-02 [Overheat Alarm Level]. Remedy: Measure the ambient temperature. Increase the airflow in the control panel. Install a cooling device (cooling fan or air conditioner) to lower the ambient temperature. Remove objects near the drive that are producing too much heat. Cause: The load is too heavy. Remedy: Measure the output current. Decrease the load. Decrease the value set in C6-02 [Carrier Frequency Selection]. Cause: The internal cooling fan of the drive stopped. Remedy: Use the procedures in this manual to replace the cooling fan. Set o4-03 = 0 [Fan Operation Time Setting = 0 h].
oH1 Heatsink Overheat	Cause: The ambient temperature is high and the heatsink temperature of the drive is more than the oH1 detection level. Remedy: Measure the ambient temperature. Increase the airflow in the control panel. Install a cooling device (cooling fan or air conditioner) to lower the ambient temperature. Remove objects near the drive that are producing too much heat. Cause: The load is too heavy. Remedy: Measure the output current. Decrease the load. Decrease the value set in C6-02 [Carrier Frequency Selection].
oH3 Motor Overheat (PTC Input)	Cause: The thermistor wiring that detects motor temperature is defective. Remedy: Correct wiring errors. Cause: A fault occurred on the machine. Example: The machine is locked. Remedy: Examine the machine and remove the cause of the fault. Cause: The motor has overheated. Remedy: Check the load level, acceleration/deceleration time, and motor start/stop frequency (cycle time). Decrease the load. Increase the values set in C1-01 to C1-04. Set E2-01 [Motor Rated Current (FLA)] correctly. Make sure that the motor cooling system is operating correctly, and repair or replace it if it is damaged. Adjust E1-04 to E1-10 [V/f Pattern Parameters]. For motor 2, adjust E3-04 to E3-10. Decrease values in E1-08 and E1-10.
oH4 Motor Overheat Fault (PTC Input)	Cause: The motor has overheated. Remedy: Check the load level, acceleration/deceleration time, and motor start/stop frequency (cycle time). Decrease the load. Increase the values set in C1-01 to C1-04. Set E2-01 [Motor Rated Current (FLA)] correctly. Make sure that the motor cooling system is operating correctly. Adjust E1-04 to E1-10 [V/f Pattern Parameters]. For motor 2, adjust E3-04 to E3-10. Note: If E1-08 and E1-10 are set too low, the overload tolerance will decrease at low speeds.
oL1 Motor Overload	Cause: The load is too heavy. Remedy: Decrease the load. Reset oL1 when U4-16 < 100. Cause: The acceleration/deceleration times or cycle times are too short. Remedy: Examine the acceleration/deceleration times and the motor start/stop frequencies. Increase the values set in C1-01 to C1-04. Cause: Overload occurred while running at low speed. Remedy: Decrease the load when running at low speed. Increase the motor speed. If the motor is run frequently at low speeds, replace the motor with a larger motor or use a drive-dedicated motor. Cause: L1-01 [Motor Overload (oL1) Protection] is set incorrectly. Remedy: Set L1-01 in as specified by the motor qualities for a drive-dedicated motor. Cause: The V/f pattern does not fit the motor qualities. Remedy: Examine the ratios between the V/f pattern frequency and voltage. Decrease the voltage if it is too high compared to the frequency. Adjust E1-04 to E1-10. For motor 2, adjust E3-04 to E3-10. Decrease values in E1-08 and E1-10. Cause: E1-06 [Base Frequency] is set incorrectly. Remedy: Set E1-06 to the rated frequency shown on the motor nameplate. Cause: One drive is operating more than one motor. Remedy: Set L1-01 = 0 [Disabled], connect thermal overload relay to each motor to prevent damage to the motor. Cause: The electronic thermal protector qualities and the motor overload properties do not align. Remedy: Examine the motor qualities and set L1-01 correctly. Connect a thermal overload relay to the motor. Cause: The electronic thermal protector is operating at an incorrect level. Remedy: Set E2-01 [Motor Rated Current (FLA)] correctly to the value specified by the motor nameplate. Cause: There is increased motor loss from overexcitation operation. Remedy: Lower the value set in n3-13 [OverexcitationBraking (OEB) Gain]. Set L3-04 ≠ 4. Set n3-23 = 0. Cause: The speed search-related parameters are set incorrectly. Remedy: Examine the settings for all speed search related parameters. Adjust b3-03. Set b3-24 = 1 after Auto-Tuning. Cause: Phase loss in the input power supply is causing the output current to change. Remedy: Make sure that there is no phase loss, and repair problems. Cause: Overload occurred during overexcitation deceleration. Remedy: Decrease the value set in n3-13. Decrease the value set in n3-21.
oL2 Drive Overload	Cause: The load is too large. Remedy: Decrease the load. Cause: The acceleration/deceleration times or cycle times are too short. Remedy: Examine the acceleration/deceleration times and the motor start/stop frequencies. Increase the values set in C1-01 to C1-04. Cause: The V/f pattern does not fit the motor qualities. Remedy: Examine the ratios between the V/f pattern frequency and voltage. Decrease the voltage if it is too high compared to the frequency. Adjust E1-04 to E1-10. Decrease values in E1-08 and E1-10. For motor 2, adjust E3-04 to E3-10. Cause: The drive capacity is too small. Remedy: Replace the drive with a larger capacity model. Cause: Overload occurred while running at low speed. Remedy: Decrease the load when running at low speed. Replace the drive with a larger capacity model. Decrease the value set in C6-02 [Carrier Frequency Selection]. Cause: The torque compensation gain is too large. Remedy: Decrease the value set in C4-01 [Torque Compensation Gain] to make sure that the motor does not stall. Cause: The speed search-related parameters are set incorrectly. Remedy: Examine the settings for all speed search-related parameters. Adjust b3-03. Set b3-24 = 1 after Auto-Tuning. Cause: Phase loss in the input power supply is causing the output current to change. Remedy: Correct errors with the wiring for main circuit drive input power. Make sure that there is no phase loss, and repair problems. Cause: Overload occurred during overexcitation deceleration. Remedy: Decrease the value set in n3-13. Decrease the value set in n3-21.
oL3 Overtorque Detection 1	Cause: A fault occurred on the machine (e.g., machine is locked) OR parameters are incorrect for the load. Remedy: Examine the machine and remove the cause of the fault. Adjust L6-02 [Torque Detection Level 1] and L6-03 [Torque Detection Time 1] settings.
oL4 Overtorque Detection 2	Cause: A fault occurred on the machine (e.g., machine is locked) OR parameters are incorrect for the load. Remedy: Examine the machine and remove the cause of the fault. Adjust L6-05 [Torque Detection Level 2] and L6-06 [Torque Detection Time 2] settings.
oL7 High Slip Braking Overload	Cause: Load inertia too large, external force rotated motor, or HSB Overload Time (n3-04) is too small. Remedy: Decrease deceleration times in C1-02 and C1-04 for applications not using High Slip Braking. Increase the value set in n3-04. Connect a thermal overload relay to the motor and set n3-04 = 1200 s.
oPr Keypad Connection Fault	Cause: Keypad not securely connected or connection cable is disconnected. Remedy: Examine the connection between the keypad and the drive. Remove the keypad and connect it again. If the cable is damaged, replace it.
oS Overspeed	Cause: There is overshoot. Remedy: Decrease C5-01 [ASR Proportional Gain 1] and increase C5-02 [ASR Integral Time 1].
ov Overvoltage	Cause: Deceleration time too short (regenerative energy flowing to drive). Remedy: Set L3-04 = 1 [Stall Prevention during Decel = General Purpose]. Increase C1-02 or C1-04 [Deceleration Times]. Perform Deceleration Rate Auto-Tuning. Cause: Acceleration time too short. Remedy: Increase C1-01 or C1-03 [Acceleration Times]. Increase C2-02 [S-Curve Time @ End of Accel]. Set L3-11 = 1 [Overvoltage Suppression Select = Enabled]. Cause: Output cable/motor shorted to ground (charging main circuit capacitor). Remedy: Examine motor main circuit cable, terminals, and terminal box; remove ground faults. Re-energize the drive. Cause: Speed search parameters incorrect (during speed search, power loss recovery, or premium efficiency motor usage). Remedy: Set b3-19 ≠ 0 [Speed Search Restart Attempts]. Adjust b3-03 [Speed Search Deceleration Time]. Do Stationary Auto-Tuning for Line-to-Line Resistance, then set b3-24 = 1. Increase L2-04 [Powerloss V/f Recovery Ramp Time]. Cause: Power supply voltage too high. Remedy: Decrease power supply voltage to align with drive rated voltage. Cause: Electrical interference. Remedy: Examine control/main circuit lines and ground wiring. Ensure magnetic contactor is not the source of interference; use Surge Protective Device. Cause: Load inertia set incorrectly or Motor hunting. Remedy: Adjust L3-25 [Load Inertia Ratio]. Adjust n1-02 [Hunting Prevention Gain] and n8-45/n8-47.
ov2 DC Bus Overvoltage 2	Cause: Wiring is too long and DC bus voltage is too large. Remedy: Shorten the shielded motor cable. Decrease the carrier frequency. Switch on internal EMC filter (if power supply has neutral ground).
PE1 PLC Fault 1	Cause: The communication option detected a fault. Remedy: Refer to the manual for the communication option card.
PE2 PLC Fault 2	Cause: The communication option detected a fault. Remedy: Refer to the manual for the communication option card.
PF Input Phase Loss	Cause: Input phase loss, loose wiring, or voltage changing too much. Remedy: Correct errors with wiring for main circuit drive input power. Tighten terminal screws to correct torque. Examine input power stability and magnetic contactor. Set L8-05 = 0 [Input Phase Loss Protection Sel = Disabled] (if balance unsatisfactory). Cause: Main circuit capacitors unserviceable. Remedy: Examine capacitor maintenance time (U4-05). If >90%, replace control board or drive. If input power is correct but fault stays, replace control board or drive.
PSE JOHB-SMP3 Protocol Set Error	Cause: DIP switches on JOHB-SMP3 card are at factory default or invalid. Remedy: Remove power, wait for charge light to go out, then set DIP switches to desired protocol.
SC Short Circuit/IGBT Failure	Cause: Overheating damaged motor/insulation, motor main circuit cable grounding, or output short circuit. Remedy: Measure motor insulation resistance; replace motor if unserviceable. Examine motor main circuit cable for damage/repair short circuits. Check for short circuits in terminals +1, U/T1, V/T2, W/T3. If short circuit exists, contact Yaskawa or sales representative. When A1-02=5 (OLV/PM), set L8-27 correctly.
SCF Safety Circuit Fault	Cause: The safety circuit is broken. Remedy: Make sure you ground the drive correctly and re-energize. If fault stays, replace control board or drive.
SEr Speed Search Retries Exceeded	Cause: Speed search-related parameters incorrect OR motor coasting in opposite direction. Remedy: Decrease b3-10 [Speed Estimation Detection Gain]. Increase b3-17 and b3-18 (Retry Current/Time). Do Auto-Tuning again. Set b3-14 = 1 [Bi-directional Speed Search = Enabled].
SPCNR Single Phase Converter Not Ready	Cause: Digital input for Single Phase Converter deactivated (faulted or not ready). Remedy: Examine wiring between drive and converter. Examine error code on converter.
STPo Motor Step-Out Detected	Cause: Incorrect motor code, load too large/inertia too large, or acceleration/deceleration times too short. Remedy: Set E5-01 correctly. Increase n8-55 [Motor to Load Inertia Ratio]. Increase n8-51 [Pull-in Current] (or adjust n8-79 if during decel). Increase C1-01 to C1-04 times or C2-01 S-Curve. Replace drive/motor with larger capacity.
TiM Keypad Time Not Set	Cause: Battery is in keypad, but date and time are not set. Remedy: Use the keypad to set the date and time.
UL3 Undertorque Detection 1	Cause: Fault on machine (e.g., broken belt) or incorrect parameters. Remedy: Examine machine and remove cause. Adjust L6-02 and L6-03 settings.
UL4 Undertorque Detection 2	Cause: Fault on machine (e.g., broken belt) or incorrect parameters. Remedy: Examine machine and remove cause. Adjust L6-05 and L6-06 settings.
UL6 Underload or Belt Break Detected	Cause: Output current decreased less than motor underload curve (L6-14) for longer than L6-03. Remedy: Adjust L6-14 setting to set output current to stay above underload curve during normal operation.
Uv1 DC Bus Undervoltage	Cause: Phase loss, loose wiring, unstable input power, or magnetic contactor issue. Remedy: Correct wiring errors and tighten terminals. Examine input power stability and magnetic contactor on main circuit side. Cause: Loss of power or Capacitors unserviceable. Remedy: Use better power supply. Examine U4-05 [Capacitor Maintenance]; replace board/drive if >90%. Cause: Soft-charge bypass relay damaged. Remedy: Check U4-06; replace board or drive if >90%.
Uv2 Control Power Undervoltage	Cause: L2-02 [Power Loss Ride Through] increased but momentary power loss unit not connected OR hardware problem. Remedy: Connect the momentary power loss recovery unit to the drive. Re-energize the drive. If fault stays, replace control board or drive.
Uv3 Soft Charge Answerback Fault	Cause: Relay/contactor on soft-charge bypass is damaged OR air inside drive is too hot. Remedy: Re-energize the drive. Check monitor U4-06; if >90%, replace board/drive. Check the ambient temperature of the drive.
VLTS Thermostat Fault	Cause: Digital input set for Thermostat Fault (H1-xx = 88) is active. Remedy: Examine the wiring or wait for the motor to cool.
AEr Station Address Setting Error	Cause: The node address for the communication option is not in the permitted setting range. Remedy: For CANopen communication, set F6-35 [CANopen Node ID Selection] correctly.
AUXFB PI Aux Feedback Level Loss	Cause: The analog input from the terminal set to H3-xx = 27 [MFAI Function Selection = PI Auxiliary Control Feedback Level] is more than 21 mA or less than 3 mA for longer than 1 s. Remedy: Repair transducer or wiring.
bAT Keypad Battery Low Voltage	Cause: The keypad battery voltage is low. Remedy: Replace the keypad battery.
bb Baseblock	Cause: An external baseblock command was entered through one of the MFDI terminals Sx, and the drive output stopped as shown by an external baseblock command. Remedy: Examine the external sequence and timing of the baseblock command input.
bCE Bluetooth Communication Error	Cause: The smartphone or tablet with DriveWizard Mobile or DriveWizard is too far from the keypad. Radio waves from a different device are causing interference. Remedy: Move to 10 m (32.8 ft) or less from the keypad. Make sure that no device around the keypad uses the same radio bandwidth (2400 MHz to 2480 MHz).
BuDif Main Fdbk Lost, Using Diff Fdbk	Cause: The drive detected a wire-break on the analog input terminal set for PID Feedback (or Main PID Feedback Transducer is broken). Remedy: Examine the connection of the Main PID Feedback Transducer. Replace Main PID Feedback Transducer.
Bu-Fb Main Fdbk Lost Using Backup Fdbk	Cause: The drive detected wire-break on the analog input terminal set to H3-xx = B [PID Feedback] (or Transducer is broken). Remedy: Examine the connection of the Main PID Feedback Transducer. Replace Main PID Feedback Transducer.
BuFbl Backup Fdbk Lost Chk/Repl Xducer	Cause: The drive detected wire-break on the analog input terminal set for PID Feedback Backup [H3-xx = 24]. Remedy: Examine the connection of the Differential PID Feedback transducer. Replace Backup PID Feedback Transducer.
bUS Option Communication Error	Cause: Communication cable wiring is incorrect or disconnected. Short-circuit in communications cable. Electrical interference. Option card is incorrectly installed or damaged. Remedy: Correct wiring errors and repair short circuits. Examine control/main circuit lines and ground wiring to decrease interference. Use a Surge Protective Device on magnetic contactors if necessary. Use shielded lines and separate communication wiring from drive power lines. Correctly install or replace the option card.
bUSy Busy	Cause: You set the drive to use MEMOBUS/Modbus communications to change parameters, but you used the keypad. You tried to change a parameter while the drive was changing setting. Remedy: Use MEMOBUS/Modbus communications to enter the command, then use the keypad. Wait until the process is complete.
CALL Serial Comm Transmission Error	Cause: Communications cable wiring is incorrect, disconnected, or shorted. Programming error on the controller side. Damage to communications circuitry. Termination resistor setting incorrect. Remedy: Correct wiring errors and replace defective cables. Examine communications at start-up and correct programming errors. Do a self-diagnostics check; replace control board if needed. On the last drive in network, set DIP switch S2 to ON.
CE Modbus Communication Error	Cause: Communications cable wiring is incorrect, shorted, or disconnected. Electrical interference. Communication protocol is not compatible. H5-09 [CE Detection Time] is too small. Controller software/hardware issue. Remedy: Correct wiring errors and use shielded lines. Examine controller settings and correct communication conditions (H5-xx). Increase the value set in H5-09. Examine the controller and remove the cause of the problem.
CE Run at H5-34 (CE Go-To-Freq)	Cause: (Same as standard CE Error) Wiring incorrect, interference, protocol incompatibility, or timeout. Remedy: Repair short circuits and connect cables. Examine control circuit lines and decrease electrical interference. Check H5-xx settings and increase H5-09. Examine the controller.
CrST Cannot Reset	Cause: The drive received a fault reset command when a Run command was active. Remedy: Turn off the Run command then de-energize and re-energize the drive.
CyPo Cycle Power to Accept Changes	Cause: Although F6-15 = 1 [Reload Now], the drive does not update the communication option parameters. Remedy: Re-energize the drive to update the communication option parameters.
dEv Speed Deviation	Cause: The load is too heavy. Acceleration and deceleration times are set too short. dEv detection level settings (F1-10, F1-11) are incorrect. The load is locked up or holding brake is stopping motor. Remedy: Decrease the load. Increase values in C1-01 to C1-04. Adjust F1-10 and F1-11. Examine machine and release holding brake.
DIFF Differential Feedback Exceeded	Cause: The difference between the PID Feedback and Differential Level Source [H3-xx = 2D] is more than the level set in Y4-18. Remedy: Replace the feedback transducer or transducers. Set Y4-18 and Y4-19 correctly.
dnE Drive Disabled	Cause: A terminal set for H1-xx = 6A [MFDI Function Selection = Drive Enable] deactivated. Remedy: Examine the operation sequence.
DS De-Scale/De-Rag Active	Cause: The terminal is set to H2-xx = C5 or 1C5 and the set length of run time elapsed. Remedy: If you do not want to De-Scale, set Y8-01 = 0. Adjust the Y8-08 [Run Time before De-Scale] setting.
EF FWD/REV Run Command Input Error	Cause: The drive received a forward command and a reverse command at the same time for longer than 0.5 s. Remedy: Examine the forward and reverse command sequence and correct the problem.
EF0 Option Card External Fault	Cause: The communication option card received an external fault from the controller, or programming error occurred. Remedy: Find the device that caused the external fault and remove the cause. Clear the external fault input from the controller. Examine the operation of the controller program.
EF1 External Fault (Terminal S1)	Cause: MFDI terminal S1 caused an external fault through an external device, or wiring is incorrect. Remedy: Find the device that caused the external fault and remove the cause. Correctly connect the signal line to MFDI terminal S1. Correctly set the MFDI parameters.
EF2 External Fault (Terminal S2)	Cause: MFDI terminal S2 caused an external fault through an external device, or wiring is incorrect. Remedy: Find the device that caused the external fault and remove the cause. Correctly connect the signal line to MFDI terminal S2. Correctly set the MFDI parameters.
EF3 External Fault (Terminal S3)	Cause: MFDI terminal S3 caused an external fault through an external device, or wiring is incorrect. Remedy: Find the device that caused the external fault and remove the cause. Correctly connect the signal line to MFDI terminal S3. Correctly set the MFDI parameters.
EF4 External Fault (Terminal S4)	Cause: MFDI terminal S4 caused an external fault through an external device, or wiring is incorrect. Remedy: Find the device that caused the external fault and remove the cause. Correctly connect the signal line to MFDI terminal S4. Correctly set the MFDI parameters.
EF5 External Fault (Terminal S5)	Cause: MFDI terminal S5 caused an external fault through an external device, or wiring is incorrect. Remedy: Find the device that caused the external fault and remove the cause. Correctly connect the signal line to MFDI terminal S5. Correctly set the MFDI parameters.
EF6 External Fault (Terminal S6)	Cause: MFDI terminal S6 caused an external fault through an external device, or wiring is incorrect. Remedy: Find the device that caused the external fault and remove the cause. Correctly connect the signal line to MFDI terminal S6. Correctly set the MFDI parameters.
EF7 External Fault (Terminal S7)	Cause: MFDI terminal S7 caused an external fault through an external device, or wiring is incorrect. Remedy: Find the device that caused the external fault and remove the cause. Correctly connect the signal line to MFDI terminal S7. Correctly set the MFDI parameters.
EF8 External Fault (Terminal S8)	Cause: MFDI terminal S8 caused an external fault through an external device, or wiring is incorrect. Remedy: Find the device that caused the external fault and remove the cause. Correctly connect the signal line to MFDI terminal S8. Correctly set the MFDI parameters.
EOF Emergency Override FWD	Cause: The digital input terminal set to H1-xx = AF [Emergency Override FWD] activated. Remedy: When the emergency condition is gone, deactivate the digital input set to Emergency Override FWD.
EOR Emergency Override REV	Cause: The digital input terminal set to H1-xx = B0 [Emergency Override REV] activated. Remedy: When the emergency condition is gone, deactivate the digital input set to Emergency Override REV.
EP24v External Power 24V Supply	Cause: The voltage of the main circuit power supply decreased, and the 24 V power supply is supplying power to the drive. Remedy: Examine the main circuit power supply. Turn ON the main circuit power supply to run the drive.
FDBKL Feedback Loss Wire Break	Cause: PID Feedback analog input is > 21 mA or < 3 mA for longer than 1s (Signal selection 4-20mA). Remedy: Make sure that you install the PID feedback source and it operates correctly.
FLGT Feedback Loss, Go To Freq b5-83	Cause: PID Feedback analog input is > 21 mA or < 3 mA for longer than 1s (Signal selection 4-20mA). Remedy: Make sure that you install the PID feedback source and it operates correctly.
FR Freq Ref < Minimum Speed (Y1-06)	Cause: The drive frequency reference setting is less than the value set in Y1-06 [Minimum Speed]. Remedy: Increase the frequency reference to a value more than Y1-06.
FR Freq. Reference < Thrust (Y4-12)	Cause: The drive frequency reference setting is less than the value set in Y4-12 [Thrust Frequency]. Remedy: Increase the frequency reference to a value more than Y4-12.
HCA High Current Alarm	Cause: The load is too heavy. The acceleration time is too short. The drive is trying to operate a specialized motor or a motor larger than the drive rating. Remedy: Decrease the load for applications with repetitive starts/stops or replace with larger drive. Calculate necessary torque, increase acceleration times (C1-01/03), or adjust S-Curves (C2-01 to C2-04). Examine motor nameplate and ensure drive rating matches motor rating.
HIAUX High PI Aux Feedback Level	Cause: PI Auxiliary Feedback is more than the level set in YF-12 for the time set in YF-13. Remedy: Decrease the PI Auxiliary Feedback level to less than YF-12. Set YF-12 and YF-13 correctly.
HIFB High Feedback Sensed	Cause: The feedback level is more than the level set in Y1-11 [High Feedback Level]. Remedy: Decrease the feedback level to less than Y1-11 – Y1-14. Set Y1-11 and Y1-12 correctly.
L24v Loss of External Power 24 Supply	Cause: The voltage of the backup 24 V power supply has decreased. Remedy: Examine the external 24 V power supply for disconnected wires/wiring errors. Examine the external 24 V power supply for problems.
LCP Low City Pressure	Cause: Insufficient pressure is present on the inlet to the pump. Remedy: Examine the pressure switch contact and control wiring. Make sure suction pressure is present. Set Y4-22 and Y4-23 correctly. Deactivate the digital input set to Low City Pressure.
LOAUX Low PI Aux Feedback Level	Cause: PI Auxiliary Feedback is less than the level set in YF-09 for the time set in YF-10. Remedy: Increase the PI Auxiliary Feedback level more than YF-09. Set YF-09 and YF-10 correctly.
LOFB Low Feedback Sensed	Cause: The feedback level is less than the level set in Y1-08 for the time set in Y1-09. Remedy: Increase the feedback level to more than Y1-08 + Y1-14. Set Y1-08 and Y1-09 correctly.
LoG Com Error / Abnormal SD Card	Cause: Drive connected to USB. Too many log files (>1000) or no memory space. Communication error between keypad and drive. Keypad does not support short-term data logs. Remedy: Put a micro SD card in the keypad. Set o5-01 = 0 [Log Start/Stop Selection = OFF]. Connect a keypad that supports short-term data logs (REV: H or later).
LOP Loss of Prime	Cause: Pump load is less than the level set in Y1-19 for the time set in Y1-20. Remedy: Examine a dry well, air in the system, or no water. Use priming method. Allow system to pump water again if there is resistance. Set Y1-18 to Y1-21 correctly.
LSP Low Suction Pressure	Cause: An external input (Low Suction Pressure) has indicated insufficient suction pressure. Remedy: Examine pressure switch and wiring. Make sure suction pressure is present. Increase system pressure. Set Y4-22 and Y4-23 correctly.
LT-1 Cooling Fan Maintenance Time	Cause: The cooling fan is at 90% of its performance life estimate. Remedy: Replace the cooling fan. Set o4-03 = 0 to reset the cooling fan operation time.
LT-2 Capacitor Maintenance Time	Cause: The capacitors for the main circuit and control circuit are at 90% of their performance life estimate. Remedy: Replace the control board or the drive. Contact Yaskawa or sales representative.
LT-3 SoftChargeBypassRelay MainteTime	Cause: The soft charge bypass relay is at 90% of its performance life estimate. Remedy: Replace the control board or the drive.
LT-4 IGBT Maintenance Time (50%)	Cause: The IGBT is at 50% of its performance life estimate. Remedy: Check the load, carrier frequency, and output frequency.
LWT Low Water In Tank	Cause: An external input has indicated that the water level in the tank is too low. Remedy: Examine pressure switch and wiring. Make sure suction pressure is present. Increase the water level. Set Y4-22 and Y4-23 correctly.
NMS Setpoint Not Met	Cause: The feedback deviates from the setpoint at a level more than Y1-15 for the time set in Y1-16. Remedy: Examine for a blocked impeller, over cycling, or broken pipe. Set Y1-15 and Y1-16 correctly.
OD Output Disconnect	Cause: The output circuit between the drive and motor is open (current < 5% of FLA). Remedy: Close the disconnected output circuit between the drive and the motor. If you do not use a motor disconnect, set Y4-42 = 0 [Disabled].
oH Heatsink Overheat	Cause: High ambient temperature. Not sufficient airflow around the drive / Dust clogging fan. Internal cooling fan stopped. Remedy: Measure ambient temperature, increase airflow, install cooling device. Check installation space and circulation. Clean dust/debris. Replace cooling fan and reset o4-03.
oH2 External Overheat (H1-XX=B)	Cause: An external device sent an oH2 alarm. Remedy: Find the external device that output the overheat alarm. Remove the cause of the problem. Clear the Overheat Alarm (oH2) by MFDI terminal.
oH3 Motor Overheat (PTC Input)	Cause: Defective thermistor wiring. Machine locked/Fault on machine. Motor overheated (Load, Accel time, E2-01 setting, V/f pattern). Remedy: Correct wiring errors. Examine machine and remove fault. Decrease load, Increase C1-01 to C1-04, Check E2-01. Check cooling system. Adjust V/f pattern (E1-04 to E1-10).
oL3 Overtorque 1	Cause: A fault occurred on the machine (e.g., locked). Parameters are incorrect for the load. Remedy: Examine the machine and remove the cause of the fault. Adjust L6-02 and L6-03 settings.
oL4 Overtorque 2	Cause: A fault occurred on the machine (e.g., locked). Parameters are incorrect for the load. Remedy: Examine the machine and remove the cause of the fault. Adjust L6-05 and L6-06 settings.
oS Overspeed	Cause: There is overshoot. Remedy: Decrease C5-01 [ASR Proportional Gain 1] and increase C5-02 [ASR Integral Time 1].
ov DC Bus Overvoltage	Cause: Drive output cable/motor shorted to ground. Power supply voltage too high. Electrical interference (noise). Remedy: Examine motor main circuit cable, terminals, and motor box for ground faults. Decrease power supply voltage to align with drive rated voltage. Examine control/main circuit lines, grounding, and install Surge Protective Device if necessary.
ovEr Too Many Parameters Changed	Cause: You tried to change more than 150 parameters. Remedy: Make sure that parameters that do not have an effect on drive operation are at their default settings. Note: • You can change 150 parameters maximum. • If you change parameters that have dependencies, the drive can detect ovEr when the number of changed parameters is fewer than 150.
PASS Modbus Communication Test	Cause: The MEMOBUS/Modbus communications test is complete. Remedy: The PASS display will turn off after communications test mode is cleared.
PF Input Phase Loss	Cause: There is a phase loss in the drive input power. Loose wiring in the input power terminals. The drive input power voltage is changing too much. Unsatisfactory balance between voltage phases. The main circuit capacitors are unserviceable. Remedy: Correct errors with the wiring for main circuit drive input power. Tighten the terminal screws to the correct tightening torque. Examine the input power for problems and make the drive input power stable. If the input power supply is good, examine the magnetic contactor on the main circuit side for problems. Examine the capacitor maintenance time in monitor U4-05 [CapacitorMaintenance]. If U4-05 is more than 90%, replace the capacitor. Re-energize the drive. If the alarm stays, replace the circuit board or the drive. Note: The drive detects this error if the DC bus voltage changes irregularly without regeneration. Use L8-05 to enable/disable detection.
R-DNE Remote Drive Disable	Cause: The digital input set to H1-xx = BD [Remote Drive Disable] activated. The digital input set to H1-xx = 1BD [!Remote Drive Disable] deactivated. Remedy: Examine the statuses of the digital input terminals set to H1-xx = BD or 1BD.
rUn Motor Switch during Run	Cause: The drive received a Motor 2 Selection [H1-xx = 16] during run. Remedy: Make sure that the drive receives the Motor 2 Selection while the drive is stopped.
SE Modbus Test Mode Error	Cause: MEMOBUS/Modbus communications self-diagnostics [H1-xx = 67] was done while the drive was running. Remedy: Stop the drive and do MEMOBUS/Modbus communications self-diagnostics.
SPCNR Single Phase Converter Not Ready	Cause: When YC-14 = 1, the digital input set to H1-xx = BE [Single Phase Converter Ready NC] deactivated to show that the attached converter is faulted or not ready. Remedy: Examine the wiring between the drive and converter. Examine the error code on converter.
STo Safe Torque OFF	Cause: Safe Disable inputs H1-HC and H2-HC are open. There is internal damage to the two Safe Disable channels. Remedy: Make sure that the Safe Disable signal is input from an external source to terminal H1-HC and H2-HC. When the Safe Disable function is not in use, use a jumper to connect terminals H1-HC and H2-HC. Replace the board or the drive (Contact Yaskawa).
SToF Safe Torque OFF Hardware	Cause: One of the two terminals H1-HC or H2-HC received the Safe Disable input signal. The Safe Disable input signal is wired incorrectly. There is internal damage to one Safe Disable channel. Remedy: Make sure that the Safe Disable signal is input from an external source to terminals H1-HC or H2-HC. When the Safe Disable function is not in use, use a jumper to connect terminals H1-HC and H2-HC. Replace the board or the drive.
TiM Keypad Time Not Set	Cause: There is a battery in the keypad, but you have not set the date and time. Remedy: Use the keypad to set the date and time. Note: Parameter o4-24 [bAT Detection selection] enables and disables TiM detection.
TrPC IGBT Maintenance Time (90%)	Cause: The IGBT is at 90% of its performance life estimate. Remedy: Replace the IGBT or the drive. For more information, contact Yaskawa or your nearest sales representative.
UL3 Undertorque Detection 1	Cause: A fault occurred on the machine. Example: There is a broken pulley belt. The parameters are incorrect for the load. Remedy: Examine the machine and remove the cause of the fault. Adjust L6-02 [Torque Detection Level 1] and L6-03 [Torque Detection Time 1] settings.
UL4 Undertorque Detection 2	Cause: A fault occurred on the machine. Example: There is a broken pulley belt. The parameters are incorrect for the load. Remedy: Examine the machine and remove the cause of the fault. Adjust L6-05 [Torque Detection Level 2] and L6-06 [Torque Detection Time 2] settings.
UL6 Underload or Belt Break Detected	Cause: The output current decreased less than the motor underload curve set in L6-14 for longer than the time set in L6-03. The belt has broken disconnecting the motor from the load. Remedy: Examine parameters L6-13 [Motor Underload Curve Select] and L6-14.
Uv Undervoltage	Cause: The drive input power voltage is changing too much. There is a phase loss in the drive input power. There is loose wiring in the drive input power terminals. There was a loss of power. The main circuit capacitors have become unserviceable. The drive input power transformer is too small and voltage drops when the power is switched on. Air inside the drive is too hot. The Charge LED is broken. Remedy: Examine the input power for problems and make stable. Correct errors with the wiring for main circuit drive input power. Tighten the terminal screws to the correct tightening torque. Use a better power supply. Examine capacitor maintenance time (U4-05). If > 90%, replace control board/drive. Check for alarm when MCCB/ELCB/Magnetic Contactor is ON. Check the capacity of the drive power supply transformer. Check the ambient temperature of the drive. Replace the control board or the entire drive. Note: The drive detects this error if one of these conditions is correct when the Run command has not been input (while the drive is stopped): – The DC bus voltage < L2-05 – The Contactor that prevents inrush current in the drive was opened. – There is low voltage in the control drive input power.
oPE01 Drive Capacity Setting Error	Cause: The value set in o2-04 [Drive Model (KVA) Selection] does not agree with the drive model. Remedy: Set o2-04 to the correct value.
oPE02 Parameter Range Setting Error	Cause: Parameter settings are not in the applicable setting range, or relationships between parameters are incorrect (e.g., Motor Rated Current E2-01 ≤ No-Load Current E2-03). Remedy: Push the enter key to show U1-18 [oPE Fault Parameter] to find the specific parameter causing the error. Make sure E2-01 > E2-03. Check Logical conflicts between L8-12 and L8-35 (Installation method vs Temperature). Ensure PI2 Control limits are correct (S3-09 > S3-10 and S3-13 < S3-15). Correct parameter settings as indicated by U1-18.
oPE03 Multi-Function Input Setting Err	Cause: The settings for these parameters do not agree or overlap: F3-10 to F3-25 [Terminal D1 to DF Function Selection] H1-01 to H1-08 [Terminals S1 to S8 Function Selection] H7-01 to H7-04 [Virtual Multi-Function Inputs] MFDI pairs set incorrectly (e.g., Up/Down command set simultaneously). Remedy: Set the parameters correctly to prevent MFDI function overlap. If using Up/Down or Run/FWD wire sequences, ensure pairs are set correctly. Remove function settings that are not in use.
oPE05 Run Cmd/Freq Ref Source Sel Err	Cause: The setting to assign the Run command or frequency reference to an option card or the pulse train input is incorrect. Option PCB selected (b1-01=3 or b1-02=3) but no card connected. Pulse Train Input selected (b1-01=4) but H6-01 is not 0. Digital Input Data Length conflicts (F3-01 vs F3-03). Remedy: Connect an option card to the drive if Option PCB is selected. Set H6-01 = 0 if using Pulse Train Input. Set F3-03 = 2 [16-bit] if required. Correct the parameter settings.
oPE07 Analog Input Selection Error	Cause: The settings for H3-02, H3-06, H3-10 [MFAI Function Selection] and H7-30 [Virtual Analog Input Selection] overlap or conflict with PID settings. Remedy: Set H3-02, H3-06, H3-10, and H7-30 correctly to prevent overlap. Set values to F or 1F [Not Used] for unused terminals. If using Differential Level Source (H3-xx = 2D), ensure Y4-41 is set correctly for backup PID feedback.
oPE08 Parameter Selection Error	Cause: You set a function that is not compatible with the control method set in A1-02. V/f Control conflicts with Dynamic Noise Control (S1-01) or Output Disconnect (Y4-42). PM Motor settings (E5-xx) incorrect for OLV/PM (A1-02=5). Drive capacity/Motor mismatch for specific control modes. Remedy: Push the enter key to show U1-18 [oPE Fault Parameter]. Set S1-01 = 0 or Y4-42 = 0 if in V/f mode. Set E5-01 correctly based on the motor nameplate. Set E5-09 and E5-24 to 0 if required by the control mode.
oPE09 PID Control Selection Fault	Cause: PID Control is enabled (b5-01=1) but conflicts with other parameters: Frequency Reference Lower Limits (d2-02). Sleep Level Type (Y2-01). Thrust Frequency (Y4-12) or Minimum Speed (Y1-06). Remedy: Correct the parameter settings causing the conflict. Verify b5-01 setting.
oPE10 V/f Data Setting Error	Cause: The parameters that set the V/f pattern do not satisfy the required frequency conditions (Min ≤ Mid Point A ≤ Base ≤ Mid Point B ≤ Max). Remedy: Set parameters (E1-09 through E1-04 for Motor 1) correctly to satisfy the logical frequency order.
oPE11 Carrier Frequency Setting Error	Cause: These parameters are set at the same time incorrectly: C6-05 > 6 [Carrier Freq Proportional Gain]. C6-04 > C6-03 [Carrier Frequency Lower Limit > Upper Limit]. Remedy: Set C6-02 to C6-05 correctly.
oPE16 Energy Saving Constants Error	Cause: The Energy Saving parameters are not set in the applicable setting range, or Energy Saving Control overlaps with Dynamic Noise Control (S1-01=1). Remedy: Make sure E5-xx is set correctly as specified by motor nameplate data. Disable Energy Saving Control or Dynamic Noise Control.
oPE33 Digital Output Selection Error	Cause: Inverse output functions (H2-01 to H2-03 = 1xx) are selected while secondary functions (H2-60, H2-63, H2-66) are used. Remedy: Clear the H2-01 to H2-03 = 1xx [Inverse output of xx] settings. Note: It is not possible to use inverse output when using output functions for logic operations.
End1 Excessive Rated Voltage Setting	Cause: The torque reference was more than 20% during Auto-Tuning or the no-load current that was measured after Auto-Tuning is more than 80%. Remedy: Make sure that the input motor nameplate data is correct. Do Auto-Tuning again and correctly set the motor nameplate data. If you can uncouple the motor and load, remove the motor from the machine and do Rotational Auto-Tuning again. If you cannot uncouple the motor and load, use the results from Auto-Tuning.
End2 Iron Core Saturation Coefficient	Cause: The motor nameplate data entered during Auto-Tuning is incorrect. Remedy: Make sure that the input motor nameplate data is correct. Do Auto-Tuning again and correctly set the motor nameplate data.
End3 Rated Current Setting Alarm	Cause: The rated current value is incorrect. Remedy: Do Auto-Tuning again and set the correct rated current shown on the motor nameplate.
End4 Adjusted Slip Calculation Error	Cause: – The Auto-Tuning results were not in the applicable parameter setting range. – The motor rated slip that was measured after Stationary Auto-Tuning was 0.2 Hz or lower. – The secondary resistor measurement results were not in the applicable range. Remedy: Make sure the input motor nameplate data is correct. Do Rotational Auto-Tuning again and correctly set the motor nameplate data. If you cannot uncouple the motor and load, do Stationary Auto-Tuning 2.
End5 Resistance Tuning Error	Cause: The Auto-Tuning results of the Line-to-Line Resistance were not in the applicable range. Remedy: Make sure that the input motor nameplate data is correct. Examine and repair damaged motor wiring.
End6 Leakage Inductance Alarm	Cause: – The Auto-Tuning results were not in the applicable parameter setting range. – A1-02 [Control Method Selection] setting is not applicable. Remedy: Make sure that the input motor nameplate data is correct, and do Auto-Tuning again. Examine the value set in A1-02.
End7 No-Load Current Alarm	Cause: – The Auto-Tuning results of the motor no-load current value were not in the applicable range. – Auto-Tuning results were less than 5% of the motor rated current. Remedy: Examine and repair damaged motor wiring. Make sure that the input motor nameplate data is correct, and do Auto-Tuning again.
End8 HFI Alarm	Cause: – Inductance saliency ratio (E5-07/E5-06) is too small. – The drive cannot find the n8-36 [HFI Frequency Level for L Tuning] value. Remedy: Set the correct value on the motor nameplate to E5-xx [PM Motor Settings] or do rotational/stationary Auto-Tuning. When it is necessary to set n8-35 = 1, make sure that there is no unusual noise in the low speed range (10% or less) and that the motor does not rotate in reverse at start. Note: If the drive detects End8, it will automatically set n8-35 = 0 [Pull-in]. Do not change the settings unless necessary.
End9 Initial Pole Detection Alarm	Cause: The drive cannot calculate the correct value for n8-84 [Polarity Detection Current] during High Frequency Injection Tuning. Remedy: When n8-35 = 1 [Initial Pole Detection Method = High Frequency Injection], make sure that the motor does not rotate in reverse at start. Note: If the drive detects End9, it will automatically set n8-35 = 0 [Pull-in]. Do not change the settings unless necessary.
Er-01 Motor Data Error	Cause: – The motor nameplate data entered during Auto-Tuning is incorrect. – The combination of the motor rated power and motor rated current do not match. – The combination of the motor rated current that was entered and E2-03 [Motor No-Load Current] do not match. – The combination of the setting values of Motor Base Frequency and Motor Base Speed do not match. Remedy: Make sure that the motor nameplate data is correct. Do Auto-Tuning again and correctly set the motor nameplate data. Examine the combination of drive capacity and motor output. Examine the motor rated current and the no-load current. Set E2-03 correctly.
Er-02 Drive in an Alarm State	Cause: – The motor nameplate data entered during Auto-Tuning is incorrect. – You did Auto-Tuning while the drive had a minor fault or alarm. – There is a defective motor cable or cable connection. – The load is too large. – The drive detected a minor fault during Auto-Tuning. Remedy: Make sure that the motor nameplate data entered in Auto-Tuning is correct. Clear the minor fault or alarm and do Auto-Tuning again. Examine and repair motor wiring. Decrease the load. Examine the machine area to see if, for example, the motor shaft is locked. Examine the minor fault code and remove the cause of the problem.
Er-03 STOP Button was Pressed	Cause: During Auto-Tuning, STOP was pushed. Remedy: Auto-Tuning did not complete correctly. Do Auto-Tuning again.
Er-04 Line-to-Line Resistance Error	Cause: – The Auto-Tuning results were not in the applicable parameter setting range. – Auto-Tuning did not complete in a pre-set length of time. – There is a defective motor cable or cable connection. – The motor nameplate data entered during Auto-Tuning is incorrect. Remedy: Examine and repair motor wiring. Disconnect the machine from the motor and do Rotational Auto-Tuning again. Make sure that the input motor nameplate data is correct. Do Auto-Tuning again and correctly set the motor nameplate data.
Er-05 No-Load Current Error	Cause: – The Auto-Tuning results were not in the applicable parameter setting range. – Auto-Tuning did not complete in a pre-set length of time. – The motor nameplate data entered during Auto-Tuning is incorrect. – Rotational Auto-Tuning was done with a load that was more than 30% of the rating connected to the motor. Remedy: Examine and repair motor wiring. Disconnect the machine from the motor and do Rotational Auto-Tuning again. Make sure that the input motor nameplate data is correct. If you cannot uncouple the motor and load, make sure that the load is less than 30% of the motor rating. If a mechanical brake is installed, release the brake during Rotational Auto-Tuning.
Er-08 Rated Slip Error	Cause: – The motor nameplate data entered during Auto-Tuning is incorrect. – Auto-Tuning did not complete in a pre-set length of time. – The Auto-Tuning results were not in the applicable parameter setting range. – Rotational Auto-Tuning was done with a load that was more than 30% of the rating connected to the motor. Remedy: Make sure that the input motor nameplate data is correct. Examine and repair the motor wiring. If the motor and machine are connected during Rotational Auto-Tuning, decouple the motor from the machinery. Disconnect the machine from the motor and do Rotational Auto-Tuning again. If you cannot uncouple the motor and load, make sure that the load is less than 30% of the motor rating and release any mechanical brake.
Er-09 Acceleration Error	Cause: – The motor did not accelerate for the specified acceleration time. – Rotational Auto-Tuning was done with a load that was more than 30% of the rating connected to the motor. Remedy: Increase the value set in C1-01 [Acceleration Time 1]. Disconnect the machine from the motor and do Rotational Auto-Tuning again. If you cannot uncouple the motor and load, make sure that the load is less than 30% of the motor rating and release any mechanical brake.
Er-12 Current Detection Error	Cause: – There is a phase loss in the drive input power (U/T1, V/T2, W/T3). – The current exceeded the current rating of the drive. – The output current is too low. – You tried Auto-Tuning without a motor connected to the drive. – There was a current detection signal error. Remedy: Examine and repair motor wiring. Check the motor wiring for any short circuits between the wires. Check and turn ON any magnetic contactors used between motors. Replace the control board or the drive. Connect the motor and do Auto-Tuning.
Er-13 Leakage Inductance Error	Cause: – The motor rated current value is incorrect. – The drive could not complete tuning for leakage inductance in fewer than 300 s. Remedy: Correctly set the rated current indicated on the motor nameplate and do Auto-Tuning again. Examine and repair motor wiring.
Er-18 Back EMF Error	Cause: The result of the induced voltage tuning was not in the applicable range. Remedy: Make sure that the input motor nameplate data is correct. Do Auto-Tuning again and correctly set the motor nameplate data.
Er-19 PM Inductance Error	Cause: The Auto-Tuning results of the PM motor inductance were not in the applicable range. Remedy: Make sure that the input motor nameplate data is correct. Do Auto-Tuning again and correctly set the motor nameplate data.
Er-20 Stator Resistance Error	Cause: The Auto-Tuning results of the PM Motor Stator Resistance were not in the applicable range. Remedy: Make sure that the input motor nameplate data is correct. Do Auto-Tuning again and correctly set the motor nameplate data.
Er-25 HighFreq Inject Param Tuning Err	Cause: The motor data is incorrect. Remedy: Do Stationary Auto-Tuning again. Note: If the drive detects Er-25 after you do Stationary Auto-Tuning, it is possible that the motor cannot use high frequency injection. For more information, contact Yaskawa or your nearest sales representative.
CPEr Control Mode Mismatch	Cause: The keypad setting and drive setting for A1-02 [Control Method Selection] do not agree. Remedy: Set A1-02 on the drive to the same value that is on the keypad. Restore the parameters.
CPyE Error Writing Data	Cause: Parameter restore did not end correctly. Remedy: Restore the parameters.
CSEr Control Mode Mismatch	Cause: The keypad is broken. Remedy: Replace the keypad.
dFPS Drive Model Mismatch	Cause: You tried to restore parameters to a different drive model than the one that you backed up. Remedy: Examine the drive model that you used to back up the parameters. Restore the parameters.
iFEr Keypad Communication Error	Cause: There was a communications error between the keypad and the drive. Remedy: Examine the connector or cable connection.
ndAT Error Received Data	Cause: The parameter settings for model and specifications (power supply voltage and capacity) are different between the keypad and the drive. Remedy: Make sure that drive model and the value set in o2-04 [Drive Model (KVA) Selection] agree. Restore the parameters. Cause: The parameters are not stored in the keypad. Remedy: Connect a keypad that has the correct parameters. Restore the parameters.
rdEr Error Reading Data	Cause: You tried to back up the data when o3-02 = 0 [Copy Allowed Selection = Disabled]. Remedy: Set o3-02 = 1 [Enabled] and back up again.
vAEr Voltage Class, Capacity Mismatch	Cause: The power supply specifications or drive capacity parameter settings are different between the keypad and the drive. Remedy: Make sure that drive model and the value set in o2-04 [Drive Model (KVA) Selection] agree. Restore the parameters.
vFyE Parameters do not Match	Cause: The parameters that are backed up in the keypad and the parameters in the drive are not the same. Remedy: Restore or backup the parameter again. Verify the parameters.