Yaskawa G7 Drive Fault Code List:
| Fault Codes | Cause & Solution |
|---|---|
| OC Overcurrent | Cause: The Inverter output current exceeded the overcurrent detection level. (200% of rated current) Cause & Solution: 1. A short-circuit or ground fault occurred at the Inverter output. (A short or ground fault can be caused by motor burn damage, worn insulation, or a damaged cable.) • The load is too large or the accelera- tion/deceleration time is too short. • A special-purpose motor or motor with a capacity too large for the Inverter is being used. • A magnetic contactor was switched at the Inverter output. – Reset the fault after correcting its cause. 2. There is a break in the PG wiring. – Fix the broken/disconnected wiring. 3. The PG is wired incorrectly. – Fix the wiring. 4. Power isn’t being supplied to the PG. – Supply power to the PG properly. 5. A short-circuit between +V, V, and AC terminals occurred. • Overload in the control circuit terminal. – Make sure that incorrect wiring has not been done. – Check the resistance and wiring for the frequency setting potentiometer, etc. (Check that the cur- rent for terminals +V and –V is 20 mA or less.) |
| GF Ground Fault | Cause: The ground fault current at the Inverter output exceeded approxi- mately 50% of the Inverter rated output current. Solution: 1. A ground fault occurred at the Inverter output. (A ground fault can be caused by motor burn damage, worn insulation, or a damaged cable.) – Reset the fault after correcting its cause. 2. A short-circuit between +V, V, and AC terminals occurred. Overload in the control circuit terminal. – Make sure that incorrect wiring has not been done. – Check the resistance and wiring for the frequency setting potentiometer, etc. (Check that the current for terminals +V and –V is 20 mA or less.) |
| PUF Main IGBT Fuse Blown | Cause: The fuse in the main circuit is blown. Solution: 1. The output transistor has failed because of a short-circuit or ground fault at the Inverter output. – Check whether there is a short-circuit between the following terminals. 2. A short-circuit will damage the output transistor – Replace the Inverter after correcting the cause. |
| OV DC Bus Overvolt | Cause: The main circuit DC voltage exceeded the overvoltage detection level. – 200-240 V Class: Approx. 410 V – 380-480 V Class: Approx. 820 V Solution: 1. The deceleration time is too short and the regenerative energy from the motor is too large. – Increase the deceleration time or connect a braking resistor (or Braking Resistor Unit). Alternatively, enable (set to 1) the stall prevention selection during deceleration (L3-04). 2. Motor ground fault (Ground fault current flowed to the capacitor in the control circuit of the Inverter through the power supply.) – Check the output cable, relay terminal, or motor terminal box and correct the cause of ground fault. 3. Incorrect constant setting for speed search (The speed search can be performed during momentary power loss recovery and auto restart after a fault.) – Use the speed search function. – Adjust the settings of the Speed search operating current (b3-02) and Speed search deceleration time (b3-03). – Use the estimated speed search function. (Autotuning for motor line-to-line resistance is required.) 4. Improper PG cable connection (PG noise, PG disconnection) – Check to see if the PG cable is connected properly. 5. The regenerative energy when an over- shoot occurs after acceleration is completed is too large. – In vector control, enable (set to 1) the overvoltage inhibit selection (L3-11). 6. The power supply voltage is too high. – Decrease the voltage so it’s within specifications. |
| UV1 DC Bus Undervolt | Cause: Main Circuit Undervoltage – The main circuit DC voltage is below the Undervoltage Detection Level (L2-05). – 200-240 V Class: Approx. 190 V – 380-480 V Class: Approx. 380 V Main Circuit Magnetic Connector Operation Failure – The magnetic connector stopped responding during Inverter operation. – 200-240 V Class: 30 to 110 kW – 380-480 V Class: 55 to 300 kW • An open-phase occurred with the input power supply. • A momentary power loss occurred. • The wiring terminals for the input power supply are loose. • The voltage fluctuations in the input power supply are too large. • A fault occurred in the surge prevention circuit. • The magnetic contactor in the control circuit was released (Contact failure in the auxiliary contact). • The contact of the magnetic contactor in the control circuit was corroded due to environmental dust or gas. • A fuse on the Change Power Tap Circuit Board has blown for a 400 V Class Inverter of 55 kW or higher. Solution: • Reset the fault after correcting its cause. • Improve the power supply environment. (Check to see if the correct power tap is selected.) • Improve the operating environment. • Replace the Inverter. |
| UV2 CTL PS Undervolt | Cause: Control Power Fault- The control power supply voltage dropped. – The wiring of the control power circuit is incorrect. – A Backup Capacitor Unit for Momentary Power Loss is not attached to a 200 V/400 V Class Inverter of 7.5 kW or less and the value of the Momentary power loss ridethru time (L2-02) factory setting has been changed to the larger value. Solution: – Try turning the power supply off and on. – Replace the Inverter if the fault continues to occur. – Attach a Backup Capacitor Unit for Momentary Power Loss. |
| UV3 MC Answer- back | Cause: Inrush Prevention Circuit Fault- A fault occurred in the surge pre- vention circuit. – The magnetic contactor did not respond for 10 s even though the magnetic contactor ON signal has been output. – The magnetic contactor in the main circuit failed. – The magnetic contactor excitation coil is burned out. Solution: – Try turning the power supply off and on. – Replace the Inverter if the fault continues to occur. |
| PF Input Phase Loss | Cause: Main Circuit Voltage Fault- The main circuit DC voltage oscillates unusually (not when regenerating). – This fault is detected if a load is greater than approximately 80% of the maximum motor capacity. – This fault is detected when L8-05 is set to 1. – An open-phase occurred in the input power supply. – A momentary power loss occurred. – The wiring terminals for the input power supply are loose. – The voltage fluctuations in the input power supply are too large. – The voltage balance between phases is bad. Solution: Reset the fault after correcting its cause. |
| LF Output Phase Loss | Cause: Output Open-phase- An open-phase occurred at the Inverter output. – This fault is detected when L8-07 is set to 1 or 2 Solution: 1. There is a broken wire in the output cable. • There is a broken wire in the motor- winding. • The output terminals are loose. – Reset the fault after correcting its cause. 2. The motor being used has a capacity less than 5% of the rated output current. – Check the motor and Inverter capacity. |
| OH (OH1) Heatsnk Overtemp (Heatsnk MAX Temp) | Cause: Cooling Fin Overheating- The temperature of the Inverter’s cooling fins exceeded the setting in L8-02 or the overheat protection level. Solution: OH: The temperature exceeded the setting in L8-02 (Stopping method can be changed by L8-03.). OH1: The temperature exceeded 100C (Stopping method: Coast to stop) 1. The ambient temperature is too high. Install a cooling unit. 2. There is a heat source nearby. Remove the heat source. 3. The Inverter’s cooling fan has stopped. Replace the cooling fan. our sales representative.) 4. A short-circuit between +V, V, and AC terminals occurred. Overload in the control circuit terminal. – Make sure that incorrect wiring has not been done. – Check the resistance and wiring for the frequency setting potentiometer, etc. (Check that the cur- rent for terminals +V and –V is 20 mA or less.) |
| OH3 Motor Overheat 1 | Cause: Motor Overheating Alarm- The Inverter will stop or will continue to operate according to the setting of L1-03. – The motor has overheated. Solution: – Check the size of the load and the length of the acceleration, deceleration, and cycle times. – Check the V/f characteristics. – Check the Motor Rated Current (E2-01). |
| OH4 Motor Overheat 2 | Cause: Motor Overheating Fault- The Inverter will stop according to the setting of L1-04. – The motor has overheated. Solution: – Check the size of the load and the length of the acceleration, deceler- ation, and cycle times. – Check the V/f characteristics. – Check the Motor Rated Current (E2-01). |
| RH DynBrk Resistor | Cause: Installed Braking Resistor Overheating- Braking resistor protection function set in L8-01 has operated. – The deceleration time is too short and the regenerative energy from the motor is too large. Solution: – Reduce the load, increase the deceleration time, or reduce the motor speed. – Change to a Braking Resistor Unit. |
| RR DynBrk Transistr | Cause: Internal Braking Transistor Fault- The braking transistor is not operating properly. – The braking transistor is damaged. – The Inverter’s control circuits are faulty. Solution: – Disconnect the Braking Resis- tor wiring, turn ON the power supply again, and operate the motor. If the power supply is turned ON while the Braking Resistor wiring is connected, the Braking Resistor or Inverter may overheat and be damaged. – Replace the Inverter if the fault continues to occur. |
| OL1 Motor Overloaded | Cause: Motor Overload- The motor overload protection function has operated based on the internal electronic thermal value. Solution: 1. The load is too heavy. The acceleration time, deceleration time, and cycle time are too short. – Check the size of the load and the length of the acceleration, deceler- ation, and cycle times. 2. The constant setting for speed search is incorrect. (Motor overload occurred due to motor hunting and vibration.) – Use the speed search function. – Adjust the settings of the Speed search operating current (b3-02) and Speed search deceleration time (b3-03). – Use the estimated speed search function. (Autotuning for motor line-to-line resistance is required.) 3. Motor overload occurred when running at low speed. (If a general-pur- pose motor is used, motor overload can occur when running at low speed even if running within the rated cur- rent.) Motor protection selection (L1-01) is set to general-purpose motor protection (1) when an Inverter duty motor is used. – Check the size of the load. – Check the setting of L1-01. – Increase the frame size of the Inverter. 4. The directions of the motor and PG are different. (Only in flux vector control) – Correct the PG wiring. – Correct the motor wiring. – Change the setting of PG rotation (F1-05). 5. The V/f characteristics voltage is too high. – Check the V/f characteristics. 6. The Motor Rated Current (E2-01) is incorrect. – Check the Motor Rated Current (E2-01). 7. A short-circuit between +V, V, and AC terminals occurred. Overload in the control circuit termi- nal. • Make sure that incorrect wiring has not been done. • Check the resistance and wiring for the frequency setting potentiometer, etc. (Check that the current for terminals +V and –V is 20 mA or less.) 8. The input voltage is lower than the Inverter’s output voltage reference (U1- 06) and hunting or fluctuation is occur- ring in the output current. – Decrease the setting of E1-05 (Max. Voltage). (Typically, decrease in intervals by 10%.) – Decrease the setting of C4-01 (Torque Compensation Gain) (0.0 to 0.5). |
| OL2 Inverter Overloaded | Cause: Inverter Overload- The Inverter overload protection function has operated based on the internal electronic thermal value. Solution: 1. The load is too heavy. The acceleration time, deceleration time and cycle time are too short. – Check the size of the load and the length of the acceleration, deceleration, and cycle times. 2. The constant setting for speed search is incorrect. (Motor overload occurred due to motor hunting and vibration.) – Use the speed search function. – Adjust the settings of the Speed search operating current (b3-02) and Speed search deceleration time (b3-03). – Use the estimated speed search function. (Autotuning for motor line-to-line resistance is required.) 3. The directions of the motor and PG are different. (Only in flux vector control) – Correct the PG wiring. – Correct the motor wiring. – Change the setting of PG rotation (F1-05). 4. The V/f characteristics voltage is too high. – Check the V/f characteristics. 5. The Inverter capacity is too low. – Replace the Inverter with one that has a larger capacity. 6. Inverter overload occurred when running at a low speed of 6 Hz or less. – Reduce the load. – Increase the frame size of the Inverter. – Lower the carrier frequency. |
| OL3 Overtorque Detected 1 | Cause: Overtorque Detected 1- There has been a current greater than the setting in L6-02 for longer than the setting in L6-03. Solution: – Make sure that the settings in L6-02 and L6-03 are appropriate. – Check the mechanical system and correct the cause of the overtorque. |
| OL4 Overtorque Detected 2 | Cause: There has been a current greater than the setting in L6-05 for longer than the setting in L6-06. Solution: – Make sure that the current setting in L6-05 and time setting in L6-06 are appropriate. – Check the mechanical system and correct the cause of the overtorque. |
| OL7 High-slip Braking OL | Cause: High-slip Braking OL- The output frequency did not change for longer than the time set in N3-04. – The inertia returned to the load is too large. Solution: – Make sure the load is an inertial load. – Set the system so that the deceleration time that does not produce overvoltages is 120 s or less. |
| UL3 Undertorque Detected 1 | Cause: There has been a current less than the setting in L6-02 for longer than the setting in L6-03. Solution: – Make sure that the settings in L6-02 and L6-03 are appropriate. – Check the mechanical system and correct the cause of the overtorque. |
| UL4 Undertorque Detected 2 | Cause: There has been a current less than the setting in L6-05 for longer than the setting in L6-06. Solution: – Make sure that the current setting in L6-05 and time setting in L6-06 are appropriate. – Check the mechanical system and correct the cause of the overtorque. |
| OS Overspeed | Cause: The speed has been greater than the setting in F1-08 for longer than the setting in F1-09. Solution: 1. Overshooting/Undershooting are occurring. – Adjust the gain again. 2. The reference speed is too high. – Check the reference circuit and reference gain. 3. The settings in F1-08 and F1-09 aren’t appropriate. – Check the settings in F1-08 and F1-09. |
| PGO PG Disconnection Detected | Cause: PG pulses were input when the Inverter was outputting a frequency. Solution: 1. There is a break in the PG wiring. – Fix the broken/disconnected wiring. 2. The PG is wired incorrectly. – Fix the wiring. 3. Power isn’t being supplied to the PG. – Supply power to the PG properly. 4. Brake is applied to the motor. – Check for open circuit when using brake (motor). |
| DEV Excessive Speed Deviation | Cause: The speed deviation has been greater than the setting in F1-10 for longer than the setting in F1-11. Solution: 1. The load is too heavy. – Reduce the load. 2. The acceleration time and deceleration time are too short. – Lengthen the acceleration time and deceleration time. 3. The load is locked. – Check the mechanical system. 4. The settings in F1-10 and F1-11 aren’t appropriate. – Check the settings in F1-10 and F1-11. 5. Brake is applied to the motor. – Check for open circuit when using brake (motor). |
| CF Control Fault | Cause: The torque limit was reached continuously for 3 seconds or longer during a deceleration stop during open-loop vector 1 control. – Motor constant settings are not correct. Solution: – Check the motor constants. – Perform autotuning. |
| FBL PID Feedback Reference Lost | Cause: A PID feedback reference loss was detected (b5-12 = 2) and the PID feedback input was less than b5-13 (PID feedback loss detection level) for longer than the time set in b5-14 (PID feedback loss detection time). Solution: 1. The settings in b5-13 and b5-14 aren’t appropriate. – Check the settings in b5-13 and b5-14. 2. The wiring of the PID feedback circuit is incorrect. – Fix the wiring. |
| EF0 Opt External Flt | Cause: External Fault Input from Com- munications Option Board. Solution: Check the Communication Option Board and communications signals. |
| EF3 External Fault (Input Terminal 3) | Cause: An “external fault” was input from a multi-function input terminal. Solution: – Reset external fault inputs to the multi-function inputs. – Remove the cause of the external fault. |
| EF4 External Fault (Input Terminal 4) | Cause: An “external fault” was input from a multi-function input terminal. Solution: – Reset external fault inputs to the multi-function inputs. – Remove the cause of the external fault. |
| EF5 External Fault (Input Terminal 5) | Cause: An “external fault” was input from a multi-function input terminal. Solution: – Reset external fault inputs to the multi-function inputs. – Remove the cause of the external fault. |
| EF6 External Fault (Input Terminal 6) | Cause: An “external fault” was input from a multi-function input terminal. Solution: – Reset external fault inputs to the multi-function inputs. – Remove the cause of the external fault. |
| EF7 External Fault (Input Terminal 7) | Cause: An “external fault” was input from a multi-function input terminal. Solution: – Reset external fault inputs to the multi-function inputs. – Remove the cause of the external fault. |
| EF8 External Fault (Input Terminal 8) | Cause: An “external fault” was input from a multi-function input terminal. Solution: – Reset external fault inputs to the multi-function inputs. – Remove the cause of the external fault. |
| EF9 External Fault (Input Terminal 9) | Cause: An “external fault” was input from a multi-function input terminal. Solution: – Reset external fault inputs to the multi-function inputs. – Remove the cause of the external fault. |
| EF10 External Fault (Input Terminal 10) | Cause: An “external fault” was input from a multi-function input terminal. Solution: – Reset external fault inputs to the multi-function inputs. – Remove the cause of the external fault. |
| EF11 External Fault (Input Terminal 11) | Cause: An “external fault” was input from a multi-function input terminal. Solution: – Reset external fault inputs to the multi-function inputs. – Remove the cause of the external fault. |
| EF12 External Fault (Input Terminal 12) | Cause: An “external fault” was input from a multi-function input terminal. Solution: – Reset external fault inputs to the multi-function inputs. – Remove the cause of the external fault. |
| SVE Zero-servo Fault | Cause: The rotation position moved during. Solution: 1. The torque limit is too small. – Increase the limit. 2. The load torque is too large. – Reduce the load torque. – Check for signal noise.zero-servo operation. |
| SER Search Retrials Fault | Cause: Exceeded Allowable Number of Speed Search Retrials- The speed search has been retried more than the number of times set in b3-19 (Number of speed search retrials). – The settings in b3-17 and b3-18 aren’t appropriate. Solution: Make sure that the settings in b3- 17 and b3-18 are appropriate. |
| OPR Oper Disconnect | Cause: Digital Operator Connection Fault- The connection to the Digital Operator was broken during operation for a Run Command from the Digi- tal Operator. Solution: – Check the connection to the Digital Operator. |
| CE Memobus Com Err | Cause: MEMOBUS Communications Error- A normal reception was not possible for 2 s or longer after control data was received once. Solution: Check the communications devices and communications signals. |
| BUS Option Com Err | Cause: Option Communications Error- A communications error was detected during a Run Command or while setting a frequency reference from a Communications Option Board. Solution: Check the communications devices and communications signals. |
| E5 SI-T WDT Err | Cause: SI-T Watchdog Error- Consistency error of received control data Synchronization error between master controller and Inverter for control data. Solution: Check the communications timing such as communications cycle. |
| E-15 SI-F/G Com Err | Cause: SI-F/G Communications Error Detected- A communications error was detected when a Run Command or frequency reference was set from an option board and continuous operation was set for the E-15 operation selection. Solution: – Check the communications signals. |
| E-10 SI-F/G CPU down | Cause: SI-F/G Option Board CPU Failure SI-F/G Option Board operation failed. Solution: 1. Digital Operator connection is faulty. – Disconnect and then reconnect the Digital Operator. 2. Inverter control circuit is faulty. – Replace the Inverter. |
| CPF00 COM-ERR (OP & INV) | Cause: Digital Operator Communications Error 1- Communications with the Digital Operator were not established within 5 seconds after the power was turned on. Solution: 1. The Digital Operator’s connector isn’t connected properly. – Disconnect the Digital Operator and then connect it again. 2. The Inverter’s control circuits are faulty. – Replace the Inverter. |
| CPF01 COM-ERR (OP & INV) | Cause: Digital Operator Communications Error 2- After communications were established, there was a communications error with the Digital Operator for more than 2 seconds. Solution: 1. The Digital Operator isn’t connected properly. – Disconnect the Digital Operator and then connect it again. 2. The Inverter’s control circuits are faulty. – Replace the Inverter. |
| CPF02 BB Circuit Err | Cause: Baseblock Circuit Error- Try turning the power supply off and on again. Solution: The control circuit is damaged. – Replace the Inverter. |
| CPF03 EEPROM Error | Cause: EEPROM Error Solution: 1. The Inverter power supply was shut off while writing data to the Inverter con- stants. – Initialize the constant settings (A1- 03). 2. The control circuit is damaged. – Replace the Inverter. |
| CPF04 Internal A/D Err | Cause: CPU Internal A/D Converter Error- The control circuit is damaged. Solution: 1. The control circuit is damaged. – Replace the Inverter. 2. A short-circuit between +V, V, and AC terminals occurred. Overload in the control circuit terminal. – Make sure that incorrect wiring has not been done. – Check the resistance and wiring for the frequency setting potentiometer, etc. (Check that the cur- rent for terminals +V and –V is 20 mA or less.) |
| CPF05 External A/D Err | Cause: CPU External A/D Converter Error. Solution: 1. The control circuit is damaged. – Replace the Inverter. 2. A short-circuit between +V, V, and AC terminals occurred. Overload in the control circuit terminal. – Make sure that incorrect wiring has not been done. – Check the resistance and wiring for the frequency setting potentiometer, etc. (Check that the cur- rent for terminals +V and –V is 20 mA or less.) |
| CPF06 Option error | Cause: Option Board Connection Error. Solution: 1. The option board is not connected properly. – Turn off the power and insert the board again. 2. The Inverter or option board is faulty. – Replace the option board or the Inverter. |
| CPF07 RAM-Err | Cause: ASIC Internal RAM Fault. Solution: 1. The control circuit is damaged. – Replace the Inverter. |
| CPF08 WAT-Err | Cause: Watchdog Timer Fault. Solution: 1. The control circuit is damaged. – Replace the Inverter. |
| CPF09 CPU-Err | Cause: CPU-ASIC Mutual Diagnosis Fault. Solution: 1. The control circuit is damaged. – Replace the Inverter. |
| CPF10 ASIC-Err | Cause: ASIC Version Fault. Solution: 1. The control circuit is damaged. – Replace the Inverter. |
| CPF20 Option A/D error | Cause: Communications Option Board A/D Converter Error. Solution: 1. The option board is not connected properly. – Turn off the power and insert the board again. 2. The option board’s A/D converter is faulty. – Replace the Communications Option Board. |
| CPF21 Option CPU down | Cause: Communications Option Board Self Diagnostic Error. Solution: 1. Communications Option Board fault. – Replace the option board. |
| CPF22 Option Type Err | Cause: Communications Option Board Model Code Error. Solution: 1. Communications Option Board fault. – Replace the option board. |
| CPF23 Option DPRAM Err | Cause: Communications Option Board DPRAM Error. Solution: 1. Communications Option Board fault. – Replace the option board. 2. The copy function of the Digital Operator was used during communications. – Use the copy function off-line. – Use the copy function with an option board removed. 3. The option board is not connected properly. – Turn off the power and insert the board again. |
| VCF Vcn Fail- ure | Cause: Main Circuit Capacitor Neutral Point Potential Error- An excessive imbalance occurred in the main circuit capacitor’s neutral point potential. Solution: 1. A loss in capacity due to aging of the main circuit capacitor. – Replace the main circuit capacitor. 2. The Inverter parts are faulty. – Replace the Inverter. 3. An open phase was detected for an out- put. – Refer to LF (output open phase) in this table. 4. Carrier frequency set value (C6-03, C6- 04) is unsuitable. – Check the set values for C6-03 and C6-04. The maximum output frequency that can be set for 400 V Class Inverters is restricted by the carrier frequency setting. 5. In V/f or open-loop vector control, the motor consecutively loses synchronism (the output current exceeds 200% of the Inverter rated current). – Reduce the load. – Increase the acceleration time. – Check the settings for V/f control. – Use larger capacity Inverter. |
| OPERA- TOR ERR RAM CHECK ERR | Cause: Operator Error (Internal RAM Fault)- At power ON, an error was detected from the results of the internal RAM Write/Read check. Solution: Replace the Operator. |
| OPERA- TOR ERR ROM CHECK ERR | Cause: Operator Error (CPU Internal ROM Fault)- At power ON and during operation, an error was detected when the internal ROM was checked. Solution: Replace the Operator. |
| OPERATOR ERR DATA SEND ERR | Cause: Operator Error (Transmission Circuit Fault)- During operation, send processing did not complete within 500 ms continuously at least 10 times. Solution: Replace the Operator. |
| OPERATOR ERR RAM CHECK ERR | Cause: Operator Error (Internal RAM Fault)- During operation, an error was detected when the display pattern for the character code 80 to 8F recorded in the internal RAM was checked. Solution: Replace the Operator. |
| OPERATOR ERR WATCH- DOG ERR | Cause: Operator Error (Watchdog Error)- During operation, an error was detected in the program execution. Solution: Replace the Operator. |
| EF (blinking) External Fault | Cause: Forward/Reverse Run Commands Input Together- Both the forward and Reverse Run Commands have been ON for more than 0.5 s. Solution: Check the sequence of the forward and Reverse Run Commands. Since the rotational direction is unknown, the motor will be decelerated to a stop when this minor fault occurs. |
| UV (blinking) DC Bus Undervolt | Cause: Main Circuit Undervoltage- The following conditions occurred when there was no Run signal. – The main circuit DC voltage was below the Undervoltage Detection Level Setting (L2-05). – The surge current limiting magnetic contactor opened. – The control power supply voltage when below the CUV level. Solution: 1. See causes for UV1, UV2, and UV3 faults in the previous table. – See corrective actions for UV1, UV2, and UV3 faults in the previous table. |
| FAN (blinking) Cooling Fan Fault | Cause: Inverter’s Cooling Fan Fault- An Inverter’s cooling fan fault was detected. – This fault is detected when L8-32 is set to 0. Solution: 1. The Inverter’s cooling fan has stopped. – Replace the cooling fan. |
| OH2 (blinking) OverHeat 2 | Cause: Inverter Overheating Pre-alarm- An OH2 alarm signal (Inverter over- heating alarm signal) was input from a multi-function input terminal (S3 to S7). Solution: Clear the multi-function input terminal’s overheating alarm input. |
| CALL (blinking) Com Call | Cause: Communications on Standby Control data was not normally received when power was turned ON. Solution: – Check the communications devices and signals. |
| RUNC (blinking) Ext Run Active | Cause: Reset during Run Command Input Error- The reset signal was input during Run Command input from an external terminal or other source. Solution: – Check that a Run Command is not being input from an external terminal or other source. |
| AER (blinking) SI-T Address Err | Cause: SI-T Station Number Setting Error- Station number of SI-T option board was out of setting range. Solution: 1. Station number setting error. – Check the setting of the station number. 2. Circuit of SI-T option board is faulty. – Check the communications devices and signals. |
| CYC (blinking) SI-T Cycle Err | Cause: SI-T Communications Cycle Setting Error- Communications cycle of SI-T option board was out of range. Communications cycle of SI-T option board set in master controller was out of range. Solution: Check the communication cycle of SI-T option board set in master controller. |
| BB (blinking) Baseblock | Cause: Receiving External Baseblock Command- An external baseblock signal was input from a multi-function input terminal, and the Inverter output was shut down. Solution: An external baseblock signal was input from a multi-function input terminal. – Check the external sequence. |
| HCA (blinking) High Current Alarm | Cause: Current Alarm- The output current has exceeded the overcurrent alarm level (over 150% of the rated current). Solution: 1. The load is too heavy or the accel/decel time is too short. – Increase the acceleration/deceleration time. 2. Either a specialized motor or an excessively large motor is being used. – Verify the setting for the Inverter capacity. 3. The current has risen too high while performing speed search either during a momentary loss in power or during a fault restart. – Momentary losses in power or fault restarts may occasionally trigger an overcurrent alarm, and are not necessarily indicators of an overcurrent problem. |
| LT-C (blinking) C Maintenance | Cause: Electrolytic Capacitor Maintenance Timer- Monitor U1-61 has reached 100%. Solution: 1. The electrolytic capacitors have reached their estimated maintenance time period. – Reset constant o2-18 to “0%” after replacing the electrolytic capacitors. |
| LT-F (blinking) Fan Maintenance | Cause: Cooling Fan Maintenance Timer- Monitor U1-63 has reached 100%. Solution: 1. The cooling fan has reached its estimated maintenance time period. – Replace the cooling fan and set constant o2-10 to “0H”. |
| OPE01 kVA Selection | Incorrect Inverter Capacity Setting- The Inverter capacity setting doesn’t match the Unit. |
| OPE02 Limit | Cause: Constant Setting Range Error. Solution: The constant setting is outside of the valid setting range. Press the ENTER Key on the Digital Operator to display OPE fault constant (U1-34). |
| OPE03 Terminal | Cause: Multi-function Input Selection Error. Solution: One of the following errors has been made in the multi-function input (H1-01 to H1- 10) settings: – The same setting has been selected for two or more multi-function inputs. – An UP or DOWN command was selected independently. (They must be used together.) – The UP/DOWN commands (10 and 11) and Accel/Decel Ramp Hold (A) were selected at the same time. – Speed Search 1 (61, maximum output frequency) and Speed Search 2 (62. set frequency) were selected at the same time. – The UP/DOWN commands (10 and 11) were selected while PID Control Method Selection (b5-01) was enabled. – Positive and negative speed commands have not been set at the same time. – The emergency Stop Command NO and NC have been set at the same time. |
| OPE05 Sequence Select | Cause: Option Board Selection Error. Solution: – The option board was selected as the frequency reference source by setting b1-01 to 3, but an option board isn’t connected (C option). – The frequency reference selection result can be checked with U1-85. |
| OPE06 PG Opt Missing | Cause: Control Method Selection Error Solution: – V/f control with PG feedback was selected by setting A1-02 to 1, but a PG Speed Control Board isn’t connected. |
| OPE07 Analog Selection | Cause: Multi-function Analog Input Selection Error Solution: The same setting has been selected for the analog input selection and the PID function selection. – H3-09 = B and H6-01 = 1 – H3-09 = C and H6-01 = 2 b1-01 (Reference Selection) is set to 4 (pulse input) and H6-01 (Pulse Train Input Function Selection) is set to a value other than 0 (frequency reference). |
| OPE08 | Cause: Constant Selection Error Solution: A setting has been made that is not required in the current control method. Ex.: A function used only with open-loop vector control was selected for V/f control. Press the ENTER Key on the Digital Operator to display OPE fault constant (U1-34). |
| OPE09 | Cause: PID Control Selection Error Solution: The following settings have been made at the same time. – b5-01 (PID Control Method Selection) has been set to a value other than 0. – b5-15 (PID Sleep Function Operation Level) has been set to a value other than 0. – b1-03 (Stopping Method Selection) has been set to 2 or 3. |
| OPE10 V/f Ptrn Setting | Cause: V/f Data Setting Error. Solution: 1. Constants E1-04, E1-06, E1-07, and E1-09 do not satisfy the following conditions: – E1-04 (FMAX) E1-06 (FA) > E1-07 (FB) E1-09 (FMIN) – E3-02 (FMAX) E3-04 (FA) > E3-05 (FB) E3-07 (FMIN) |
| OPE11 Carr Freq/ On-Delay | Cause: Constant Setting Error. Solution: One of the following constant setting errors exists. – C6-05 (Carrier Frequency Gain) > 6, the Carrier Frequency Lower Limit (C6-04) > the Carrier Frequency Gain (C6-05) – Upper/lower limit error in C6-03 to 05. – C6-02 is 7 to E. |
| ERR EEPROM R/W Err | Cause: EEPROM Write Error. Solution: A verification error occurred when writing EEPROM. – Try turning the power supply off and on again. – Try setting the constants again. |
| Data Invalid | Cause: Motor data error – There is an error in the data input for autotuning. – There is an error in the relationship between the motor output and the motor rated current. – The is an error between the no-load current setting and the input motor rated current (when autotuning for only line- to-line resistance is performed – for vector control). Solution: – Check the input data. – Check the capacity of the Inverter and motor. – Check the motor rated current and no-load current. |
| Minor Fault | Cause: A minor fault occurred during autotuning (xxx). Solution: – Check the input data. – Check wiring and the machine. – Check the load. |
| STOP key | Cause: STOP key input- The STOP Key was pressed to cancel autotuning. Solution: – Check the input data. – Check wiring and the machine. – Check the load. |
| Resistance | Cause: Line-to-line resistance error – Autotuning was not completed in the specified time. – The results of autotuning has exceeded the setting range for a user constant. Solution: – Check the input data. – Check motor wiring. – If the motor is connected to the machine, disconnect it. |
| No-Load Current | Cause: No-load current error – Autotuning was not completed in the specified time. – The results of autotuning has exceeded the setting range for a user constant. Solution: – Check the input data. – Check motor wiring. – If the motor is connected to the machine, disconnect it. |
| Rated Slip | Cause: Rated slip error. – Autotuning was not completed in the specified time. – The results of autotuning has exceeded the setting range for a user constant. Solution: – Check the input data. – Check motor wiring. – If the motor is connected to the machine, disconnect it. |
| Accelerate | Cause: Acceleration error (detected only for rotational autotuning) – The motor did not accelerate in the specified time. Solution: – Increase C1-01 (Acceleration Time 1). – Increase L7-01 and L7-02 (Reverse Torque Limits) if they are low. – If the motor is connected to the machine, disconnect it. |
| PG Direction | Cause: Motor Direction Error. – There is a faulty connection between the – Inverter and PC (A or B phase) or the Inverter and Motor (U, V, or W). Solution: – Check the PG wiring. – Check the motor wiring. – Check the PG rotation direction and F1-05 (PG rotation). |
| Motor Speed | Cause: Motor speed error (detected only for rotational autotuning) – The torque reference was too high (100%) during acceleration (for open- loop vector control or flux vector control). Solution: – If the motor is connected to the machine, disconnect it. – Increase C1-01 (Acceleration Time 1). – Check the input data (particularly the number of PG pulses and the number of motor poles). |
| I-det. Circuit Current detection error | Cause: The current flow exceeded the motor rated current. – The detected current sign was the oppo- site of what it should be. – There is a phase fault for U, V, or W. Solution: – Check the current detection circuit, motor wiring, current detector, and installation methods. |
| Leak Inductance | Cause: Leakage inductance error- Autotuning was not completed in the specified time. Solution: Check motor wiring. |
| PG Open | Cause: PG Disconnection Detected- PG pulses were input when the Inverter was outputting a frequency. Solution: Fix the broken/disconnected wiring. |
| V/f Over Setting | Cause: V/f settings excessive. – The torque reference exceeded 20% and the no-load torque exceeded 70% during autotuning. Solution: – Check and correct the settings. – Disconnect the load from the motor. |
| Saturation | Cause: Motor core saturation error (detected only for rotational autotuning). – The results of autotuning has exceeded the setting range for a user constant so a temporary setting was made for the motor core saturation coefficient. Solution: – Check the input data. – Check motor wiring. – If the motor is connected to the machine, disconnect it. |
| Rated FLA Alm | Cause: Rated current setting alarm- The rated current is set high. Solution: Check the input data (particularly the motor output current and motor rated current). |
| Adjusted Slip Value | Cause: Adjusted slip value fell below lower limit- As a result of stationary autotuning 1, the slip value has fallen to 0.2 Hz or below. Solution: – Check the input data. – If rotational autotuning is possible, per- form it. If impossible, perform stationary autotuning 2. |
| PRE READ IMPOSSIBLE | Cause: Digital Operator write-protected- o3-01 was set to 1 to write a constant when the Digital Operator was write- protected (o3-02 = 0). Solution: Set o3-02 to 1 to enable writing con- stants with the Digital Operator. |
| IFE READ DATA ERROR | Cause: Illegal read data- The read data length does not agree. Repeat the read. Solution: – Check the Digital Operator cable. – Replace the Digital Operator |
| RDE DATA ERROR | Cause: Illegal write status An attempted write of a constant to EEPROM on the Digital Writer failed.- A low Inverter voltage has been detected. Solution: – Repeat the read. – Replace the Digital Operator. |
| CPE ID UNMATCH | Cause: ID not matched- The Inverter product code or software number is different. Solution: Use the copy function for the same product code and software number. |
| VAE INV. KVA UNMATCH | Cause: Inverter capacity matched- The capacity of the Inverter being copied and the capacity in the Digital Operator are different. Solution: – Use the copy function for the same Inverter capacity. |
| CRE CONTROL UNMATCH | Cause: Control method matched- The control method of the Inverter being copied and the control method in the Digital Operator are different. Solution: – Use the copy function for the same control method. |
| CYE COPY ERROR Verify error | Cause: The constant written to the Inverter was compared with the constant in the Digital Operator and they were different. Solution: Retry the copy. |
| CSE SUM CHECK ERROR | Cause: Checksum error- The checksum in the Inverter constant area was compared with the checksum in the Digital Operator constant area and they were different. Solution: Retry the copy. |
| VYE VERIFY ERROR | Cause: Verify error The Digital Operator and Inverter settings do not agree. Solution: Retry the copy and verify again. |
| CPE ID UNMATCH ID not matched | Cause: The Inverter product code or software number is different. Solution: Use the copy function for the same product code and software number. |