Yaskawa iQPump Micro Drive

Yaskawa iQPump Micro Drive Fault Codes:

Fault Code and Meaning	Cause and Remedy
AJF Anti-Jam Fault	Cause: The drive was not able to clear debris from the impeller in fewer than the number of attempts set in P7-02. Remedy: Check for proper pump operation. Remove debris from the pump impeller. Adjust the P7-03 level or the P7-02 counts. Drive response to this condition is controlled by P7-01 (Anti-jam Operation Selection).
bUS Option Communication Error	Cause: The connection was lost after establishing initial communication. Only detected when run command is assigned to option card. Remedy: Check for faulty wiring, disconnected cables, or short circuits. Counteract noise in control/main circuits and ground wiring. Use surge absorbers on other equipment (switches/relays). Use shielded lines and ground correctly. Separate communication wiring from power lines. Install EMC filter. Replace the option card if damaged. Ensure option card connector pins allow proper alignment; reinstall card.
CE MEMOBUS/Modbus Communication Error	Cause: Control data was not received for the CE detection time set to H5-09. Remedy: Check for faulty wiring, disconnected cables, or short circuits. Counteract noise in control/main circuits and ground wiring. Use shielded lines and ground correctly. Use surge suppressors on switches/relays if required. Separate communication wiring from drive power lines. Install EMC filter.
CPF02 A/D Conversion Error	Cause: Control circuit is damaged. Remedy: Cycle power to the drive. If the problem continues, replace the drive.
N/A Control circuit terminals shorted / Input current exceeded	Cause: Control circuit terminals have shorted out (+V, AC) or input current exceeded allowable levels. Remedy: Check for wiring errors along the control circuit terminals. Correct the wiring. Check input current; reduce current input to control terminal (+V) to 20 mA.
CPF03 PWM Data Error	Cause: Hardware is damaged (Problem with PWM data). Remedy: Replace the drive.
CPF06 EEPROM Memory Data Error	Cause: Error in the data saved to EEPROM. (e.g., Power supply switched off while saving). Remedy: Turn off the power and check the connection between the control board and the drive. If the problem continues, replace the drive. Reinitialize the drive (A1-03 = 2220, 3330).
CPF07 Terminal Board Communications Error	Cause: There is a faulty connection between the terminal board and the control board. Remedy: Turn off the power and reconnect the control circuit terminals.
CPF08 EEPROM Serial Communication Fault	Cause: Terminal board or control board is not connected properly. Remedy: Turn the power off and check the control terminal connections. Turn off the power and reconnect the control circuit terminals.
CPF11 RAM Fault	Cause: Hardware is damaged. Remedy: Replace the drive.
CPF12 FLASH Memory Fault	Cause: Hardware is damaged (Problem with ROM/FLASH memory). Remedy: Replace the drive.
CPF13 Watchdog Circuit Exception	Cause: Hardware is damaged (Self-diagnostics problem). Remedy: Replace the drive.
CPF14 Control Circuit Fault	Cause: Hardware is damaged (CPU error due to noise, etc). Remedy: Replace the drive.
CPF16 Clock Fault	Cause: Hardware is damaged (Standard clock error). Remedy: Replace the drive.
CPF17 Timing Fault	Cause: Hardware is damaged (Timing error during internal process). Remedy: Replace the drive.
CPF18 Control Circuit Fault	Cause: Hardware is damaged (Non-Maskable Interrupt triggered by noise). Remedy: Replace the drive.
CPF19 Control Circuit Fault	Cause: Hardware is damaged (CPU error, manual reset due to noise). Remedy: Replace the drive.
CPF20 or CPF21 RAM/FLASH/Watchdog/Clock Error	Cause: Hardware is damaged (RAM, FLASH, Watchdog, or Clock error). Remedy: Replace the drive.
CPF22 A/D Conversion Fault	Cause: Control circuit is damaged. Remedy: Cycle power to the drive. If the problem continues, replace the drive.
CPF23 PWM Feedback Fault	Cause: Hardware is damaged. Remedy: Replace the drive.
CPF24 Drive Unit Signal Fault	Cause: Hardware is damaged (Drive capacity cannot be detected correctly). Remedy: Replace the drive.
CPF25 Terminal Board Not Connected	Cause: Terminal board is not connected correctly. Remedy: Reconnect the terminal board to the connector on the drive, then cycle the power to the drive.
CPF26 to CPF35 CPF40 to CPF43 Control Circuit Error / CPU Error	Cause: Hardware is damaged. Remedy: Replace the drive.
E5 SI-T3 Watchdog Timer Error	Cause: Data has not been received from the PLC. Remedy: Execute DISCONNECT or ALM_CLR. Issue a CONNECT command or SYNC_SET command and proceed to phase 3. Refer to the SI-T3 Option Technical Manual for more details.
EF0 Option Card External Fault	Cause: An external fault was received from the PLC and F6-03 is set to a value other than 3. Problem with PLC program. Remedy: Remove the cause of the external fault. Remove the external fault input from the PLC. Check the PLC program and correct problems.
EF1 to EF7 Pump Fault (External Faults S1-S7)	Cause: An external device tripped an alarm function. Wiring is incorrect. Remedy: Remove the cause of the external fault and reset the fault. Properly connect the signal lines to the terminals assigned for external fault detection (H1-xx = 20 to 2F). Reconnect the signal line.
Err EEPROM Write Error	Cause: Noise has corrupted data while writing to EEPROM or Hardware problem. Remedy: Press “ENTER” on the digital operator. Correct the parameter setting. Cycle power to the drive. If the problem continues, replace the drive.
FAn Internal Cooling Fan Failure	Cause: Internal cooling fan has malfunctioned. Remedy: Cycle power to the drive. Check for fan operation. If the problem continues, replace the fan.
Fdb-L PID Feedback Loss	Cause: Analog input programmed for PID feedback dropped below or rose above limits (3mA / 21mA). Remedy: Confirm that the PID feedback source is installed and working properly. Drive response is controlled by b5-12 and b5-13. Auto-restart is controlled by L5-42.
GF Ground Fault	Cause: Motor insulation damaged, cable short circuit, or excessive leakage current. Remedy: Check the insulation resistance of the motor. Replace motor if needed. Check motor cable for shorts. Check resistance between cable and ground. Replace cable if needed. Reduce carrier frequency. Reduce stray capacitance. Enable Speed Search (Set b3-01 to 1) if fault occurs during coasting. If hardware problem, replace the drive.
Err EEPROM Write Error	Cause: Noise has corrupted data while writing to the EEPROM. Remedy: Press “ENTER” on the digital operator. Correct the parameter setting. Cycle power to the drive. If the problem continues, replace the drive.
FAn Internal Cooling Fan Failure	Cause: Internal cooling fan has malfunctioned. Remedy: Cycle power to the drive. Check for fan operation. If the problem continues, replace the fan.
Fdb-L / FDBKL PID Feedback Loss	Cause: The analog input programmed for PID feedback has risen above 21 mA or fallen below 3 mA (effective only when b5-12 is set to 2). Remedy: Confirm that the PID feedback source is installed and working properly. Check settings b5-12 (Detection Selection) and b5-13 (Go To Frequency). Check L5-42 for Auto-restart settings.
GF Ground Fault	Cause: Motor insulation is damaged, cable is damaged causing a short, excessive leakage current, or drive started during current offset/coasting. Remedy: Check the insulation resistance of the motor and replace if damaged. Check motor cable for shorts and resistance; replace if necessary. Reduce carrier frequency or stray capacitance. Set b3-01 to 1 to enable Speed Search at Start. If Hardware problem persists, replace the drive.
HFb / HFB High Feedback	Cause: The feedback signal has risen above the level set in P1-11 for the time set in P1-12. Remedy: Set the High Feedback fault characteristics in P1-11 and P1-12. Check Drive response settings in P1-13. Check Auto-restart settings in L5-41.
HWL (H1H20) High Water Level	Cause: The “High Water Level” digital input is active (H1-xx = 90), or switch is programmed incorrectly. Remedy: Lower the water level. Adjust the High Water Level switch. Check P1-31 configuration.
LF Output Phase Loss	Cause: Output cable disconnected, motor winding damaged, loose terminals, motor rated current too low (<5%), or damaged transistor. Remedy: Check wiring and properly connect output cable. Check resistance between motor lines; replace motor if winding damaged. Tighten terminals to specified torque. Check drive and motor capacities. Ensure a single-phase motor is not being used. If problem continues, replace the drive.
LF2 Output current imbalance	Cause: Phase loss on output side, loose terminal wires, or uneven motor impedance. Remedy: Check for faulty wiring or poor connections on the output side. Tighten terminals to specified torque. Measure line-to-line resistance for each motor phase (ensure values are equal). Replace the motor or contact Yaskawa if drive is faulty.
LFb / LFB Low Feedback	Cause: Feedback signal dropped below level set in P1-08 for time set in P1-09. Remedy: Set Low Feedback fault characteristics in P1-08 and P1-09. Check response settings in P1-10. Check Auto-restart settings in L5-40.
LoP / LOP Loss of Prime	Cause: Pump load (current/power) dropped below P1-19 level for time P1-20. Remedy: Check for dry well, air in system, or no water. Restart using preferred priming method. Set Loss of Prime characteristics in P1-18 through P1-21. Check Auto-restart settings in L5-51 and P1-23.
LoH20 / LWL Low Water Level	Cause: The “Low Water Level” digital input is active, switch defective, or programmed incorrectly. Remedy: Raise the water level. Adjust the Low Water Level switch. Check P1-30 configuration.
n5L / MSL Net Master Lost	Cause: MEMOBUS master has been lost or timeout occurred. Remedy: Increase P9-26 setting to account for network latency. Verify drive exists on network (P1-01 set to 3). Check network connections and H5-01/P9-25 settings.
not5P / NMS Not Maintaining Setpoint	Cause: Feedback deviates from setpoint > P1-15 for time P1-16. Remedy: Check for blocked impeller, over cycling, or broken pipe. Set fault characteristics in P1-16 and P1-17. Check Auto-restart settings in L5-50.
n5E / nSE Node Setup Error	Cause: A terminal assigned to the node setup function closed during run. Remedy: Stop the drive when using the node setup function.
oC Overcurrent	Cause: Motor overheated/insulation damaged, short circuit, heavy load, accel/decel time too short, incorrect V/f setting, or hardware issue. Remedy: Check insulation resistance and motor cables. Measure current; replace with larger capacity drive if needed. Increase acceleration time (C1-01, C1-03). Check voltage/frequency ratios and E1-04 settings. Reduce torque compensation gain (C4-01). Set b3-01 to 1 to enable Speed Search at Start.
oFA00 Option Card Connection Error	Cause: The option card installed into port CN5 is incompatible. Remedy: Check if the drive supports the option card to be installed. Contact Yaskawa for assistance.
oFA01 Option Card Fault	Cause: The option card connection to port CN5 is faulty. Remedy: Turn off power and reconnect the option card. Check if card is properly plugged and fixed.
oFA03 to oFA43 Option Card / Comm Error	Cause: Option card or hardware is damaged. Remedy: Cycle power to the drive. If problem continues, replace control board or entire drive.
oH Heatsink Overheat	Cause: Surrounding temperature is too high. Remedy: Check the temperature surrounding the drive. Verify temperature is within drive specifications. Improve the air circulation within the enclosure panel. Install a fan or air conditioner to cool the surrounding area. Remove anything near the drive that might be producing excessive heat. Cause: Load is too heavy. Remedy: Measure the output current. Decrease the load. Lower the carrier frequency (C6-02). Cause: Internal cooling fan is stopped. Remedy: Replace the cooling fan. After replacing the cooling fan, set parameter o4-03 to 0 to reset the cooling fan maintenance.
oH1 Overheat 1 (Heatsink Overheat)	Cause: Surrounding temperature is too high. Remedy: Check the temperature surrounding the drive. Improve the air circulation within the enclosure panel. Install a fan or air conditioner to cool the surrounding area. Remove anything near the drive that might be producing excessive heat. Cause: Load is too heavy. Remedy: Measure the output current. Lower the carrier frequency (C6-02). Reduce the load. Cause: The internal cooling fan has reached its performance life or has malfunctioned. Remedy: Check the maintenance time for the cooling fan (U4-04). If U4-04 exceeds 90%, replace the cooling fan. After replacing fan, reset the fan maintenance time (o4-03 = “0”). Cause: Current flowing to control circuit terminal +V exceeded the tolerance level. Remedy: Check the current level of the terminal. Set the current to the control circuit terminal to be 20 mA or less.
oH4 Motor Overheat Fault (PTC Input)	Cause: Motor has overheated. Remedy: Check the size of the load, the accel/decel times, and the cycle times. Decrease the load. Increase the acceleration and deceleration times (C1-01 through C1-04). Adjust the preset V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10. Do not set E1-08 and E1-10 too low. This reduces load tolerance at low speeds. Check the motor rated current. Enter the motor rated current to parameter E2-01 as indicated on the motor nameplate. Ensure the motor cooling system is operating normally. Repair or replace the motor cooling system.
oL1 Motor Overload	Cause: Load is too heavy. Remedy: Reduce the load. Cause: Cycle times are too short during acceleration and deceleration. Remedy: Increase the acceleration and deceleration times (C1-01 through C1-04). Cause: A general-purpose motor is driven below the rated speed with a high load. Remedy: Reduce the load. Increase the speed. If the motor is supposed to operate at low speeds, either increase the motor capacity or use a motor specifically designed to operate in the desired speed range. Cause: The output voltage is too high. Remedy: Adjust the user-set V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10. Do not set E1-08 and E1-10 too low. Cause: The wrong motor rated current is set to E2-01. Remedy: Check the motor-rated current. Enter the motor rated current to parameter E2-01 as indicated on the motor nameplate. Cause: The base frequency is set incorrectly. Remedy: Check the rated frequency indicated on the motor nameplate. Enter the rated frequency to E1-06 (Base Frequency). Cause: The electrical thermal protection characteristics and motor overload characteristics do not match. Remedy: Check the motor characteristics. Correct the type of motor protection that has been selected (L1-01). Install an external thermal relay. Cause: Motor overheated by overexcitation operation. Remedy: Prevent excessive overexcitation operation or apply proper cooling to the motor. Reduce the excitation deceleration gain (n3-13). Set L3-04 (Stall Prevention during Deceleration) to a value other than 4. Cause: Parameters related to Speed Search are set incorrectly. Remedy: Check values set to Speed Search related parameters. Adjust the Speed Search current and Speed Search deceleration times (b3-02 and b3-03 respectively). After Auto-Tuning, set b3-24 to 1 to enable Speed Estimation Speed Search. Cause: Output current fluctuation due to power supply loss. Remedy: Check the power supply for phase loss.
oL2 Drive Overload	Cause: Load is too heavy. Remedy: Reduce the load. Cause: Acceleration or deceleration time is too short. Remedy: Increase the settings for the acceleration and deceleration times (C1-01 through C1-04). Cause: The output voltage is too high. Remedy: Adjust the preset V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10. Do not lower E1-08 and E1-10 excessively. Cause: Drive capacity is too small. Remedy: Replace the drive with a larger model. Cause: Overload occurred when operating at low speeds. Remedy: Reduce the load when operating at low speeds. Replace the drive with a model that is one frame size larger. Lower the carrier frequency (C6-02). Cause: Excessive torque compensation. Remedy: Reduce the torque compensation gain in parameter C4-01 until there is less current but no speed loss. Cause: Parameters related to Speed Search are set incorrectly. Remedy: Check the settings for all Speed Search related parameters. Adjust the current used during Speed Search (b3-03) and the Speed Search deceleration time (b3-02). After Auto-Tuning, set b3-24 to 1 to enable Speed Estimation Speed Search. Cause: Output current fluctuation due to input phase loss. Remedy: Check the power supply for phase loss.
oL3 Overtorque Detection 1	Cause: Parameter settings are not appropriate for the load. Remedy: Check L6-02 and L6-03 settings. Cause: Fault on the machine side (e.g., machine is locked up). Remedy: Check the status of the load. Remove the cause of the fault.
oL4 Overtorque Detection 2	Cause: Parameter settings are not appropriate for the load. Remedy: Check the settings of parameters L6-05 and L6-06.
oL5 Mechanical Weakening Detection 1	Cause: Overtorque occurred, triggering the mechanical weakening level set to L6-08. Remedy: Check for the cause of mechanical weakening.
oPr External Operator Connection Fault	Cause: External operator is not properly connected to the drive. Remedy: Check the connection between the keypad and the drive. Replace the cable if damaged. Turn off the drive input power and disconnect the keypad. Reconnect the keypad and reapply drive input power.
ou / ov Overvoltage	Cause: Deceleration time is too short and regenerative energy is flowing from the motor into the drive. Remedy: Increase the deceleration time (C1-02 and C1-04). Install a dynamic braking resistor or a dynamic braking resistor unit. Set L3-04 to 1 to enable stall prevention during deceleration. Cause: Fast acceleration time causes the motor to overshoot the speed reference. Remedy: Check if sudden drive acceleration triggers an overvoltage alarm. Increase the acceleration time. Use longer S-curve acceleration and deceleration times. Enable the Overvoltage Suppression function (L3-11 = 1). Lengthen the S-curve at acceleration end. Cause: Excessive braking load. Remedy: The braking torque was too high, causing regenerative energy to charge the DC bus. Reduce the braking torque, use a dynamic braking option, or lengthen decel time. Cause: Surge voltage entering from the drive input power. Remedy: Install a DC link choke. Cause: Ground fault in the output circuit causes the DC bus capacitor to overcharge. Remedy: Check the motor wiring for ground faults. Correct grounding shorts and reapply power. Cause: Improper parameters related to Speed Search (including Speed Search after a momentary power loss and after a fault restart). Remedy: Check the settings for Speed Search-related parameters. Enable Speed Search restart function (b3-19 greater than or equal to 1 to 10). Adjust the current level during Speed Search and the deceleration time (b3-02 and b3-03 respectively). Perform Stationary Auto-Tuning for line-to-line resistance and then set b3-14 to 1 to enable Speed Estimation Speed Search. Cause: Drive input power voltage is too high. Remedy: Check the voltage. Lower drive input power voltage within the limits listed in the specifications.
PF Input Phase Loss	Cause: There is phase loss in the drive input power. Remedy: Check for wiring errors in the main circuit drive input power. Correct the wiring. Cause: There is loose wiring in the drive input power terminals. Remedy: Ensure the terminals are tightened properly. Apply the tightening torque as specified in the manual. Cause: There is excessive fluctuation in the drive input power voltage. Remedy: Check the voltage from the drive input power. Review the possible solutions for stabilizing the drive input power. Cause: There is poor balance between voltage phases. Remedy: Stabilize drive input power or disable phase loss detection. Cause: The main circuit capacitors are worn out. Remedy: Check the maintenance time for the capacitors (U4-05). Replace the capacitor if U4-05 is greater than 90%. Check for problems with the drive input power.
PoC Pump Over Cycle	Cause: The pump has exceeded the number of cycles set in P2-10 in the time set in P2-11 and P2-12 is set to 2 (fault). Remedy: Set the Pump Over Cycle fault characteristics in P2-10 and P2-11. Drive response to this condition is controlled by P2-12, Over Cycling Mode. Auto-restart of this fault is controlled by L5-52, Pump Over Cycle Fault Retry Selection. Set the Pump Over Cycle automatic setpoint compensation in P2-12, Over Cycling Mode, P2-13, Setpoint Compensation, and P2-14, Maximum Setpoint Compensation.
rH Braking Resistor Overheat	Cause: Deceleration time is too short and excessive regenerative energy is flowing back into the drive. Remedy: Check the load, deceleration time, and speed. Reduce the load inertia. Increase the deceleration times (C1-01 to C1-04). Replace the dynamic braking option with a larger device that can handle the power that is discharged. Cause: The duty cycle is too high. Remedy: Check the duty cycle. Maximum of 3% duty cycle is available when L8-01 = 1. Cause: Excessive braking inertia. Remedy: Recalculate braking load and braking power. Reduce the braking load by adjusting braking resistor settings. Cause: The braking operation duty cycle is too high. Remedy: Check the braking operation duty cycle. Braking resistor protection for ERF-type braking resistors (L8-01 = 1) allows a braking duty cycle of maximum 3%. Cause: The proper braking resistor has not been installed. Remedy: Check the specifications and conditions for the braking resistor device. Select the optimal braking resistor.
rr Dynamic Braking Transistor	Cause: The built-in dynamic braking transistor failed. The braking transistor or the control circuit is damaged. Remedy: Cycle power to the drive and check for reoccurrence of the fault. Replace the drive.
SC IGBT Short Circuit or Ground Fault	Cause: An IGBT fault occurred or the drive is damaged (IGBT short circuit detection circuit fault). Remedy: Check motor wiring. Turn off the power supply, then turn it on. If the problem continues, contact your Yaskawa representative. Check the drive output side short circuit for a broken output transistor (B1, U/T1, V/T2, W/T3).
SEr Too Many Speed Search Restarts	Cause: The number of Speed Search restarts exceeded the value set to b3-19. Parameters related to Speed Search are set to wrong values, or the motor is coasting in the opposite direction. Remedy: Reduce the detection compensation gain during Speed Search (b3-10). Increase the current level when attempting Speed Search (b3-17). Increase the detection time during Speed Search (b3-18). Repeat Auto-Tuning. Set b3-14 to 1 to enable Bi-Directional Speed Search.
TIE Time Interval Error	Cause: An error has occurred in the Real-Clock Time function of the HOA keypad. Remedy: Replace the HOA keypad. Contact Yaskawa or your nearest sales representative.
UL3 Undertorque Detection 1	Cause: The current has fallen below the minimum value set for torque detection (L6-02) for longer than the allowable time (L6-03). Parameter settings may not be appropriate, or there is a fault on the machine side. Remedy: Check the settings of parameters L6-02 and L6-03. Check the load for any problems.
UL4 Undertorque Detection 2	Cause: The current has fallen below the minimum value set for torque detection (L6-05) for longer than the allowable time (L6-06). Parameter settings may not be appropriate, or there is a fault on the machine side. Remedy: Check L6-05 and L6-06 settings. Check the load for any problems.
UL6 Motor Underload (Underload Det 6)	Cause: The load has fallen below the underload curve defined in L6-14 for longer than the time set to L6-03. Remedy: Adjust the value set to L6-14 so that output current remains above the motor underload curve during normal operation.
Uv1 DC Bus Undervoltage	Cause: Voltage in the DC bus fell below detection level (L2-05). Causes include input power phase loss, loose wiring terminals, voltage problems, power interruption, worn capacitors, or damaged relay/contactor. Remedy: Correct the wiring (check for phase loss). Ensure there are no loose terminals; apply specified tightening torque. Check voltage and correct to be within range. Check for problems with the main circuit magnetic contactor. Check capacitor maintenance time (U4-05); replace drive if >90%. Cycle power; if fault reoccurs, replace the drive.
Uv2 Control Power Supply Voltage Fault	Cause: Voltage is too low for the control drive input power. L2-02 changed from default, wiring damaged, or internal circuitry damaged. Remedy: Correct the setting to L2-02 or install an optional Momentary Power Loss Ride-Thru unit. Cycle power. If fault persists, replace control board, entire drive, or control power supply. If internal circuitry is damaged, replace the drive.
Uv3 Undervoltage 3 (Soft-Charge Bypass Circuit Fault)	Cause: The soft-charge bypass circuit failed (relay or contactor damaged). Remedy: Cycle power to the drive and see if the fault reoccurs. Check monitor U4-06 for performance life of soft-charge bypass. Replace the drive if U4-06 exceeds 90% or if the problem continues.
VLTS Volute-Thermostat Fault	Cause: The digital input assigned to volute/thermostat (H1-0x = 88 or 89) is active, or both inputs are programmed simultaneously. Remedy: Check the wiring or wait for the volute or motor to cool. Program only one digital input to either H1-0x = 88 or H1-0x = 89.
AEr Station Address Setting Error	Cause: Station number is set outside the possible setting range (CC-Link, CANopen, MECHATROLINK). Remedy: Set parameter F6-10 to the proper value if a CC-Link option card is used. Set parameter F6-20 to the proper value if a MECHATROLINK option card is used. Set parameter F6-35 to the proper value if a CANopen option card is used.
AfbL Analog Feedback Lost	Cause: Defective or broken analog input source. H3-0x is not set to B (PID Feedback). Remedy: Confirm that the PID feedback source is installed and working properly. If there is no feedback source, set P9-02 to 3 so the drive will read the network PID feedback from another drive. Set H3-0x to B if the analog input source is to be used for PID feedback.
AJA Anti-Jam Active	Cause: The drive is attempting to clear debris from the impeller. This is only effective when P7-01 (Anti-jam Operation) is set to 1. Remedy: Alarm will clear when function is complete. Drive response to this condition is controlled by P7-01, Anti-jam Operation Selection.
bAT Digital Operator Battery Voltage Low	Cause: The digital operator battery is low. Remedy: Replace the digital operator battery.
bb Baseblock	Cause: External baseblock signal was entered via one of the multi-function input terminals (S1 to S7). Remedy: Check external sequence and baseblock signal input timing.
bUS Option Communication Error	Cause: The connection was lost after initial communication was established, or option is damaged/improperly connected. Remedy: Check for faulty wiring or disconnected cables. If there are no problems with wiring, replace the option. Ensure connector pins on the option are properly lined up with the drive. Reinstall the option.
CALL Serial Communication Transmission Error	Cause: Communications wiring is faulty, short circuit, or programming error on master side. Remedy: Check for wiring errors, disconnected cables, and short circuits. Check communications at start-up and correct programming errors. Perform a self-diagnostics check. Install a termination resistor at both ends of a communication line (DIP switch S2 to ON).
CE MEMOBUS/Modbus Communication Error	Cause: Control data was not received correctly for two seconds (Noise, Protocol incompatibility, or Timeout). Remedy: Check options available to minimize the effects of noise (surge absorbers, shielded lines). Check the H5 parameter settings and the protocol setting in the controller. Set a longer CE detection time using parameter H5-09. Check the connector to make sure the cable has a signal.
Clock Not Set Time and Date Not Set	Cause: Drive powered up for the first time, or button not pressed during setup screen. Remedy: Pressing the F2 (Data) key will display the setting screen again.
CrST Cannot Reset	Cause: Fault reset was being executed when a run command was entered. Remedy: Ensure that a run command cannot be entered from the external terminals or option card during fault reset. Turn off the run command.
CyC MECHATROLINK Comm. Cycle Setting Error	Cause: The controller is using a comm. cycle beyond the allowable setting range. Remedy: Set the comm. cycle for the upper controller within the allowable setting range for the MECHATROLINK option unit.
dnE Drive Disabled	Cause: “Drive Enable” is set to a multi-function contact input (H1-xx = 6A) and the contact is open. Remedy: Check the operation sequence.
E5 MECHATROLINK Watchdog Timer Error	Cause: The watchdog timer expired while waiting for data from the controller. Remedy: Issue a DISCONNECT or ALM_CLR command, followed by a CONNECT or SYNC_SET command and move to phase 3.
EF Forward/Reverse Run Command Input Error	Cause: Both forward run and reverse run closed simultaneously for longer than 0.5 s. Remedy: Check the forward and reverse command sequence and correct the problem. Note: When minor fault EF detected, motor ramps to stop.
EF0 Option Card External Fault	Cause: An external fault was received from the PLC with F6-03 set to 3. Remedy: Remove the cause of the external fault. Remove the external fault input from the PLC. Check the PLC program and correct problems.
EF1 Pump Fault (Input Terminal S1)	Cause: External device has tripped alarm or wiring incorrect on S1. Remedy: Remove the cause of the external fault and reset the multi-function input value. Ensure signal lines connected properly to terminals assigned for external fault detection (H1-xx = 20 to 2F).
EF2 Pump Fault (Input Terminal S2)	Cause: External device has tripped alarm or wiring incorrect on S2. Remedy: Remove the cause of the external fault and reset the multi-function input value. Ensure signal lines connected properly.
EF3 Pump Fault (Input Terminal S3)	Cause: External device has tripped alarm or wiring incorrect on S3. Remedy: Remove the cause of the external fault and reset the multi-function input value.
EF4 Pump Fault (Input Terminal S4)	Cause: External device has tripped alarm or wiring incorrect on S4. Remedy: Remove the cause of the external fault and reset the multi-function input value.
EF5 Pump Fault (Input Terminal S5)	Cause: External device has tripped alarm or wiring incorrect on S5. Remedy: Remove the cause of the external fault and reset the multi-function input value.
EF6 Pump Fault (Input Terminal S6)	Cause: External device has tripped alarm or wiring incorrect on S6. Remedy: Remove the cause of the external fault and reset the multi-function input value.
EF7 Pump Fault (Input Terminal S7)	Cause: External device has tripped alarm or wiring incorrect on S7. Remedy: Remove the cause of the external fault and reset the multi-function input value. Check if unused terminals have been set for H1-xx = 20 to 2F.
EoF Emergency Override Forward Run	Cause: The multi-function digital input for EmergOverrideFWD (H1-xx = AF) has been closed. Remedy: Open H1-xx = AF if the emergency condition is no longer present.
Eor Emergency Override Reverse Run	Cause: The multi-function digital input for EmergOverrideREV (H1-xx = B0) has been closed. Remedy: Open H1-xx = B0 if the emergency condition is no longer present.
E5 SI-T3 Watchdog Timer Error	Cause: The watchdog timed out. Data has not been received from the PLC. Remedy: Execute DISCONNECT or ALM_CLR, then issue a CONNECT command or SYNC_SET command. Refer to the SI-T3 Option Technical Manual for troubleshooting.
FAn Internal Cooling Fan Error	Cause: Internal cooling fan has malfunctioned. Remedy: Cycle power to the drive. Check for fan operation. If the problem continues, replace the fan.
Hbb / HbbF Safe Disable Signal Input	Cause: There is no signal at terminal H1, or the safe disable input hardware is defective. Remedy: Check if external safety circuit tripped and disabled the drive. If the Safe Disable function is not utilized, check if the terminals HC, H1, and H2 are linked. If internally broken (HbbF), replace the drive.
FLGt PID Feedback Loss (Go To Freq)	Cause: PID feedback source is incorrectly installed or not working (Effective when b5-12 is 3). Remedy: Confirm that the PID feedback source is installed and working properly. Drive response is controlled by b5-12 and b5-13.
Fdb-L PID Feedback Loss (Wire Break)	Cause: The analog input for PID feedback has gone above 21 mA or fallen below 3 mA. Remedy: Confirm that the PID feedback source is installed and working properly. Auto-restart of this fault is controlled by L5-42.
PFrEF Minimum Pump Frequency Reference	Cause: The frequency reference is set lower than P1-06 (Minimum Pump Frequency). Remedy: Increase the frequency reference to a value greater than P1-06.
PtHrt Thrust Frequency Reference	Cause: The fixed frequency reference is set to a value lower than the P4-12 (Thrust Frequency) setting. Remedy: Increase the frequency reference to a value greater than P4-12.
HCA Current Alarm	Cause: Load is too heavy. Drive current exceeded overcurrent warning level (150% of rated current). Remedy: Reduce the load for applications with repetitive operations (i.e., stops and starts). Replace the drive if necessary.
HbbF Safe Disable Signal Input	Cause: The safe disable input hardware is defective or the Safe Disable channel is broken. Remedy: Replace the drive.
FLGt PID Feedback Loss (Go To Freq)	Cause: PID feedback source is incorrectly installed or is not working. Effective only when b5-12 is set to 3. Remedy: Confirm that the PID feedback source is installed and working properly. Check settings for b5-12 (Detection Selection) and b5-13 (Go To Frequency).
Fdb-L PID Feedback Loss (Wire Break)	Cause: The analog input programmed for PID feedback has gone above 21 mA or fallen below 3 mA. Remedy: Confirm that the PID feedback source is installed and working properly. Check settings for b5-12 and b5-13. Auto-restart of this fault is controlled by L5-42.
PFrEF Minimum Pump Frequency Reference	Cause: Drive frequency reference is set lower than P1-06 (Minimum Pump Frequency). Remedy: Increase the frequency reference to a value greater than P1-06.
PtHrt Thrust Frequency Reference	Cause: The fixed frequency reference is set to a value lower than the P4-12 (Thrust Frequency) setting. Remedy: Increase the frequency reference to a value greater than P4-12.
HCA Current Alarm	Cause: Drive current exceeded overcurrent warning level (150% of rated current). Load is too heavy. Remedy: Reduce the load for applications with repetitive operations. Replace the drive. Increase acceleration and deceleration times (C1-01 through C1-04). Check motor capacity.
H1Fb High Feedback Level Alarm	Cause: The feedback signal is too high (risen above P1-11). Remedy: Decrease the feedback signal. Set the High Feedback alarm characteristics in P1-11 and P-12.
LoP Loss of Prime	Cause: Water level dropped below P1-19. Could be due to dry well, air in system, or no water. Remedy: If there is resistance in the pump, allow the system to pump water again. Set the Loss of Prime alarm characteristics in P1-18, P1-19, P1-20, and P1-21.
LCP Low City Pressure	Cause: Insufficient pressure is present on the inlet to the pump. Remedy: Check pressure switch contact for correct operation. Check control wiring to drive terminal strip from pressure switch contact. Check to make sure that suction pressure is present by means of a separate measuring device.
LoFb Low Feedback Level Alarm	Cause: The feedback signal is too low (dropped below P1-08). Remedy: Increase the feedback signal. Set the Low Feedback alarm characteristics in P1-08 and P1-09.
LSP Low Suction Pressure	Cause: Insufficient suction pressure is present. Remedy: Check pressure switch contact for correct operation. Check control wiring to drive terminal strip from pressure switch contact. Check to make sure that suction pressure is present by means of a separate measuring device.
LLLt Low Water in Tank	Cause: The water level in the tank is too low. Remedy: Check pressure switch contact for correct operation. Check control wiring to drive terminal strip from pressure switch contact. Raise the water level.
LT-1 Cooling Fan Maintenance Time	Cause: The cooling fan has reached 90% of its expected performance life. Remedy: Replace the cooling fan. Set o4-03 to 0 to reset the Maintenance Monitor.
LT-2 Capacitor Maintenance Time	Cause: The main circuit and control circuit capacitors have reached 90% of their expected performance lives. Remedy: Replace the drive.
LT-3 Soft Charge Bypass Relay Maintenance Time	Cause: The DC bus soft charge relay has reached 90% of expected performance life. Remedy: Replace the drive.
LT-4 IGBT Maintenance Time (50%)	Cause: IGBTs have reached 50% of their expected performance life. Remedy: Check the load, carrier frequency, and output frequency.
nEtSC NETSCAN Waiting for Master	Cause: No message was received from the master within the time set in P9-28. Remedy: Increase the P9-26 setting to account for network latency. Verify that there is a drive on the network with parameter P1-01 set to 3 and P9-27 to 0. Check network connections and settings.
notSP Not Maintaining Setpoint	Cause: The setpoint cannot be maintained (deviation > P1-15 for time P1-16). Remedy: Check for a blocked impeller, over cycling, or broken pipe. Set the Not Maintaining Setpoint alarm characteristics in P1-16 and P1-17.
oH Heatsink Overheat	Cause: Heatsink temperature exceeded L8-02. Cooling fan stopped. Airflow restricted. Remedy: Check surrounding temperature and improve air circulation. Replace cooling fan (and reset o4-03). Clear debris caught in the fan.
oH2 Drive Overheat Warning	Cause: An external device triggered an overheat warning (input terminal S1-S7). Remedy: Search for the device that tripped the overheat warning. Remove the cause of the problem.
oH3 Motor Overheat	Cause: Motor thermostat wiring faulty. Machine fault. Motor overheated. Remedy: Repair PTC input wiring. Check status of machine (e.g. locked up). Decrease load. Adjust preset V/f pattern (E1-04 to E1-10). Check motor-rated current (E2-01).
oL1 Motor Overload	Cause: Load too heavy. Cycle times too short. Wrong V/f pattern. Wrong motor rated current setting. Remedy: Reduce the load. Increase acceleration/deceleration times. Adjust V/f pattern (reduce E1-08/E1-10). Check motor nameplate and enter correct rated current in E2-01. Check motor protection type (L1-01).
oL2 Drive Overload	Cause: Thermal sensor of drive triggered. Load too heavy. Accel/Decel too short. Low speed operation. Remedy: Reduce the load. Increase acceleration/deceleration times. Replace drive with larger model. Lower the carrier frequency (C6-02).
oL3 Overtorque Detection 1	Cause: Current exceeded value in L6-02 for longer than L6-03. Remedy: Check L6-02 and L6-03 settings. Check status of the load (e.g. machine locked up).
oL2 Drive Overload (The thermal sensor of the drive triggered overload protection)	Cause: Load is too heavy. Acceleration or deceleration time is too short. The output voltage is too high. Drive capacity is too small. Overload occurred when operating at low speeds. Excessive torque compensation. Parameters related to Speed Search are set incorrectly. Output current fluctuation due to input phase loss. Remedy: Reduce the load. Increase the settings for acceleration and deceleration times (C1-01 through C1-04). Adjust the preset V/f pattern (E1-04 through E1-10) by reducing E1-08 and E1-10. Replace the drive with a larger model. Lower the carrier frequency (C6-02). Reduce the torque compensation gain in parameter C4-01. Adjust Speed Search current (b3-03) and deceleration time (b3-02). Check the power supply for phase loss.
oL3 Overtorque Detection 1 (Current exceeded value set in L6-02 for longer than L6-03)	Cause: Parameter settings are not appropriate for the load. Fault on the machine side (e.g., machine is locked up). Remedy: Check L6-02 and L6-03 settings. Check the status of the load. Remove the cause of the fault.
oL4 Overtorque Detection 2 (Current exceeded value set in L6-05 for longer than L6-06)	Cause: Parameter settings are not appropriate for the load. Remedy: Check the settings of parameters L6-05 and L6-06.
ov DC Bus Overvoltage (DC bus voltage exceeded the trip point)	Cause: Surge voltage present in the drive input power. The motor is short-circuited. Ground current has overcharged the main circuit capacitors via the drive input power. Noise interference causes the drive to operate incorrectly. Remedy: Install a DC link choke or an AC reactor. Check the motor power cable, relay terminals, and motor terminal box for short circuits. Review section on handling noise interference and check control circuit lines and ground wiring. If magnetic contactor is the noise source, install a surge protector to the MC coil. Set number of fault restarts (L5-01) to a value other than 0.
PCYC Pump Over Cycle	Cause: The pump has exceeded the number of cycles set in P2-10 in the time set in P2-11 and P2-12 is set to 1 (alarm). Remedy: Set the Pump Over Cycle alarm characteristics in P2-10 and P2-11. Drive response to this condition is controlled by P2-12 (Over Cycling Mode).
rdd Remote Drive Disable	Cause: Terminal S□ (H1-0□ = 95) has been closed for the time set in P4-26 (N.O. setting). Terminal S□ (H1-0□ = 95) has been open for the time set in P4-26 (N.C. setting). Remedy: Remove conditions causing the terminal to close (or open, depending on selection).
SE MEMOBUS/Modbus Communication Test Mode Error	Cause: A digital input set to 67H (MEMOBUS/Modbus test) was closed while the drive was running. Remedy: Stop the drive and run the test again.
TdE Time Data Error	Cause: An error has occurred in the Real-Clock Time function of the HOA keypad. Remedy: Replace the HOA keypad. Contact Yaskawa or your nearest sales representative.
TrPC IGBT Maintenance Time (90%)	Cause: IGBTs have reached 90% of their expected performance life. Remedy: Replace the drive.
UL3 Undertorque Detection 1 (Current fallen below L6-02 for longer than L6-03)	Cause: Parameter settings are not appropriate for the load. There is a fault on the machine side. Remedy: Check the settings of parameters L6-02 and L6-03. Check the load for any problems.
UL4 Undertorque Detection 2 (Current fallen below L6-05 for longer than L6-06)	Cause: Parameter settings are not appropriate for the load. There is a fault on the machine side. Remedy: Check L6-05 and L6-06 settings. Check the load for any problems.
UL6 Motor Underload (Load fallen below underload curve L6-14)	Cause: The output current has fallen below the motor underload curve defined in L6-14 for longer than the time set to L6-03. Remedy: Adjust the value set to L6-14 so that output current remains above the motor underload curve during normal operation.
Uv Undervoltage	Cause: Phase loss in the drive input power. Loose wiring in the drive input power terminals. There is a problem with the drive input power voltage. Drive internal circuitry is worn. The drive input power transformer is too small and voltage drops when power is switched on. Remedy: Check for wiring errors in the main circuit drive input power. Correct the wiring. Ensure terminals are properly tightened (Refer to torque specs). Check the voltage. Lower the voltage of the drive input power so it is within limits. Check maintenance time for capacitors (U4-05). Replace drive if U4-05 exceeds 90%. Check the capacity of the drive input power transformer.
oPE01 Drive Capacity Setting Fault	Cause: The drive model selection (o2-04) and the actual capacity of the drive are not the same. Remedy: Correct the value set to o2-04.
oPE02 Parameter Range Setting Error	Cause: Parameters were set outside the possible setting range. Remedy: Use U1-18 to find parameters set outside the range. Set parameters to the proper values.
oPE03 Multi-Function Input Selection Error	Cause: A contradictory setting is assigned to multi-function contact inputs H1-01 to H1-07. Common conflicts include: The same function is assigned to two inputs. Up command set without Down command (or vice versa). Run/Stop (2-wire) set without FWD/REV command. Contradictory functions set simultaneously (e.g., Up/Down and PID control). Remedy: Ensure all multi-function inputs are assigned to different functions. Re-enter the multi-function settings to ensure this does not occur. Check if contradictory settings have simultaneously been assigned to the multi-function input terminals. Set b5-01 to 0 to disable control PID or disable the Up/Down command if both are enabled.
oPE04 Initialization Required (Term <-> Ctrl Chg)	Cause: The drive, control board, or terminal board have been replaced and the parameter settings between the control board and the terminal board no longer match. Remedy: Set A1-03 to 5550 to load the parameter settings stored in the terminal board to the drive. Initialize parameters after drive replacement by setting A1-03 to 1110 or 2220.
oPE05 Run Command/Frequency Reference Source Selection Error	Cause: Frequency reference or Run command is assigned to an option card (b1-01/b1-02 = 3) but no card is connected. Frequency reference assigned to pulse train input (b1-01 = 4) and terminal RP is not set for frequency reference input. Remedy: Reconnect the input option card to the drive. Set H6-01 to 0 if pulse train is not used properly.
oPE07 Multi-Function Analog Input Selection Error	Cause: A contradictory setting is assigned to multi-function analog inputs H3-02 or H3-10 and PID functions conflict (set to the same value). Remedy: Change the settings to H3-02 or H3-10 so that functions no longer conflict.
oPE09 PID Control Selection Fault	Cause: PID control function selection is incorrect. Simultaneous contradictory settings for PID Feedback/Target vs Pulse Train. b5-01 is set to 1 or 2 (PID enabled), but lower limit (d2-02) is not 0 while reverse output is enabled (b5-11=1). Remedy: Disable one of the PID selections. Correct the parameter settings for b5-01, d2-02, or b5-11.
oPE10 V/f Data Setting Error	Cause: V/f pattern setting error. One of the following errors occurred: E1-09 ≤ E1-07 < E1-06 ≤ E1-11 ≤ E1-04. Remedy: Correct the settings for E1-04, E1-06, E1-07, E1-09, and E1-11.
oPE11 Carrier Frequency Setting Error	Cause: The following simultaneous contradictory settings have occurred: C6-05 > 6 and C6-04 > C6-03 (carrier frequency lower limit is greater than the upper limit). Remedy: Correct the setting for the carrier frequency (C6-02 to C6-05).
oPE33 Net Incompatible	Cause: Parameter selection is incompatible with the selected network P9-99. Remedy: Confirm parameter settings for P1-01, P9-01, P9-99, and P9-05.
CoPy Writing Parameter Settings (flashing)	Cause: Parameters are being written to the drive. Remedy: This is not an error. Wait for the process to complete.
CoPyE Error Writing Data	Cause: Failed writing parameters. Remedy: Attempt to write parameters again.
CSEr Copy Unit Error	Cause: Hardware fault. Remedy: Replace the HOA keypad or the USB Copy Unit.
dFPS Drive Model Mismatch	Cause: The drives used in the copy and write process are not the same model. Remedy: Verify the model number of the drive from which the parameters were copied. Make sure the two drives are the same model and have the same software version.
End Task Complete	Cause: Finished reading, writing, or verifying parameters. Remedy: This is not an error.
iFEr Communication Error	Cause: A communication error occurred between the drive and the HOA keypad or the USB copy unit. Remedy: Check the cable connection. Use the cable originally packaged with the USB Copy Unit.
ndAT Model, Voltage Class, Capacity Mismatch	Cause: The drive from which the parameters were copied and the drive to which they are being written have different electrical specifications, capacities, or control modes. Remedy: Make sure model numbers and specifications are the same for both drives.
rdEr Error Reading Data	Cause: Failed while attempting to read parameter settings from the drive. Remedy: Press and hold the READ key on the USB Copy Unit for at least one second.
rEAd Reading Parameter Settings (flashing)	Cause: Displayed while the parameter settings are being read onto the USB Copy Unit. Remedy: This is not an error.
vAEr Voltage Class, Capacity Mismatch	Cause: The drive from which parameters were copied and the drive being verified have different specifications. Remedy: Make sure electrical specifications and capacities are the same for both drives.
vFyE Parameter Settings Mismatch	Cause: Indicates that parameter settings that have been Read and loaded onto the Copy Unit/Keypad are different from the drive. Remedy: Synchronize parameters by writing saved parameters to the drive, or reading parameters from the drive.
vrFy Comparing Parameter Settings (flashing)	Cause: The Verify mode has confirmed that parameters on the drive and copy device are identical. Remedy: This is not an error.
CrST Cannot Reset	Cause: Fault reset was being executed when a Run command was entered. Remedy: Ensure that a Run command cannot be entered from external terminals or options during fault reset. Turn off the Run command.
Cur Current Limit Foldback	Cause: Displayed when drive output speed is being limited due to the output current limit. Remedy: Reduce the load. Replace with a higher capacity drive.
dStGE De-staging in X sec	Cause: Displayed during multiplexing when drive de-staging is in progress. Remedy: Wait for the timer to elapse (X indicates time left).
FbcH- Feedback Drop Check	Cause: Displayed when the drive is determining whether the feedback will change abruptly when entering Sleep Mode. Remedy: Check P2-08 and P2-09 settings if operation is unexpected.
LoC-P Parameter Locked	Cause: Displayed after an attempt to change a parameter when A1-01 = 3. Remedy: Unlock the keypad by setting A1-01 = 2.
nEtEr Net Pump Err (Chk Faulted Pump)	Cause: Displayed when the drive has been stopped because another drive in the network has a system fault or a Low City Pressure alarm. Remedy: Check other drives in the network for faults.
nEtSt Net Start Delay (P9-29 Active)	Cause: Displayed when the MEMOBUS network is waiting for the P9-29 timer to elapse. Remedy: Wait for the timer to elapse.
nEtFb Network FB Lost (Check FB Source)	Cause: Displayed when no valid analog PID feedback source can be found on the network. Remedy: Check the network and PID feedback source connections.
PASS MEMOBUS/Modbus Comm. Test Mode Complete	Cause: MEMOBUS/Modbus test has finished normally. Remedy: No action required.
PrCHG Pre Chg Mode (Exit in Xsec)	Cause: Pre-charge 1 or 2 active. X indicates time left before pre-charge exits due to timers (P4-03 + P4-07). Remedy: Wait for pre-charge to complete.
1PH Single Phase Foldback	Cause: Displayed when an input phase has been lost, or when excess load is being drawn by the motor in a single phase application. Remedy: Check input power phases. Check motor load.
SLEEP Sleep Active Wait for Start	Cause: Displayed when the drive is in Sleep Mode or waiting for the feedback level to reach the level set in P1-04. Remedy: Normal operation. Drive will start when demand increases.
booSt Sleep Boost Active	Cause: Displayed when the drive entering Sleep Mode and the pressure setpoint is being boosted. Remedy: Normal operation during Sleep Boost.
StAGE Staging in X sec	Cause: Displayed during multiplexing when drive staging is in progress. Remedy: Wait for staging timer to elapse.