Error Codes and Solutions
CPF23: PWM Feedback Fault

- Symptom: PWM feedback error.
- Causes and Solutions:
+ Hardware is damaged: Replace the drive.

CPF24: Drive Capacity Signal Fault

- Symptom: Entered a capacity that does not exist (Checked when the drive is powered up).
- Causes and Solutions:
+ Hardware is damaged: Replace the drive.

dEv: Speed Deviation (for Simple V/f with PG)

- Symptom: According to the pulse input (RP), the speed deviation is greater than the setting in F1-10 for longer than the time set to F1-11.
- Causes and Solutions:
+ Load is too heavy: Reduce the load.
+ Acceleration and deceleration times are set too short: Increase the acceleration and deceleration times (C1-01 through C1-08).
+ The load is locked up: Check the machine.
+ Parameters are not set appropriately: Check the settings of parameters F1-10 and F1-11.
+ Motor brake engaged: Ensure the motor brake releases properly.

dWFL: FBD’s Fault

- Symptom: dWAL FBD’s fault
- Causes and Solutions:
+ Fault output by a FBD’s program: Correct whatever caused the fault to occur.

EF0: Option Card External Fault

- Symptom: An external fault condition is present.
- Causes and Solutions:
+ An external fault was received from the PLC with F6-03 = 3 "alarm only" (the drive continued to run): Remove the cause of the external fault and remove the external fault input from the PLC.
+ Problem with the PLC program: Check the PLC program and correct problems.

EF1 to EF6: External Fault (input terminal S1 to S6)

- Symptom: External fault at multi-function input terminal S1 to S6.
- Causes and Solutions:
+ An external device has tripped an alarm function: Remove the cause of the external fault and reset the fault.
+ Wiring is incorrect: Ensure the signal lines have been connected properly to the terminals assigned for external fault detection (H1-.. = 20 to 2F). Reconnect the signal line.
+ Incorrect setting of multi-function contact inputs: Check if the unused terminals set for H1-.. = 20 to 2F (External Fault). Change the terminal settings.

Err: EEPROM Write Error

- Symptom: Data does not match the EEPROM being written to.
- Causes and Solutions:
+ Press the button, correct the parameter settings, and cycle power to the drive. Refer to "Diagnosing and Resetting Faults" on page 222.

FbH: Excessive PID Feedback

- Symptom: PID feedback input is greater than the level set b5-36 for longer than the time set to b5-37. To enable fault detection, set b5-12 = "2" or "5".
- Causes and Solutions:
+ Parameters are not set appropriately: Check the settings of parameters b5-36 and b5-37.
+ Wiring for PID feedback is incorrect: Correct the wiring.

FbL: PID Feedback Loss

- Symptom: This fault occurs when PID Feedback Loss Detection is programmed to fault (b5-12 = 2) and the PID Feedback < PID Feedback Loss Detection Level (b5-13) for the PID Feedback Loss Detection Time (b5-14).
- Causes and Solutions:
+ Parameters are not set appropriately: Check the settings of parameters b5-13 and b5-14.
+ Wiring for PID feedback is incorrect: Correct the wiring.
+ There is a problem with the feedback sensor: Check the sensor on the controller side. If damaged, replace the sensor.

GF: Ground Fault

- Symptom: Current shorted to ground exceeded 50% of rated current on the output side of the drive. Setting L8-09 to 1 enables ground fault detection in models 5.5 kW or larger.
- Causes and Solutions:
+ Motor insulation is damaged: Check the insulation resistance of the motor and replace the motor if necessary.
+ A damaged motor cable is creating a short circuit: Check the motor cable, remove the short circuit, and replace the cable if necessary.
+ The leakage current at the drive output is too high: Reduce the carrier frequency and the amount of stray capacitance.
+ The drive started to run during Current Offset Fault or while coasting to a stop: Enable Speed Search at start (b3-01 = 1) and perform Speed Search 1 or 2 (H1-xx = 61 or 62) via one of the external terminals.
+ Hardware problem: Replace the drive.

LF: Output Phase Loss

- Symptom: Phase loss on the output side of the drive. Phase Loss Detection is enabled when L8-07 is set to "1" or "2".
- Causes and Solutions:
+ The output cable is disconnected: Check for wiring errors and ensure the output cable is connected properly.
+ The motor winding is damaged: Check the resistance between motor lines and replace the motor if the winding is damaged.
+ The output terminal is loose: Apply the specified tightening torque to fasten the terminals.
+ The motor being used is less than 5% of the drive rated current: Check the drive and motor capacities.
+ An output transistor is damaged: Replace the drive.
+ A single-phase motor is being used: The drive cannot operate a single-phase motor.

LF2: Output Current Imbalance

- Symptom: One or more of the phases in the output current is lost.
- Causes and Solutions:
+ Phase loss has occurred on the output side of the drive: Check for faulty wiring or poor connections and correct the wiring.
+ Terminal wires on the output side of the drive are loose: Apply the specified tightening torque to fasten the terminals.
+ No signal displays from the gate driver board: Replace the drive and contact OYMC or an OYMC representative for assistance.
+ Motor impedance or motor phases are uneven: Measure the line-to-line resistance for each motor phase and ensure all values are the same. Replace the motor if necessary.

oC: Overcurrent

- Symptom: Drive sensors have detected an output current greater than the specified overcurrent level.
- Causes and Solutions:
+ The motor has been damaged due to overheating or the motor insulation is damaged: Check the insulation resistance and replace the motor if necessary.
+ One of the motor cables has shorted out or there is a grounding problem: Check the motor cables, remove the short circuit, and replace damaged cables if necessary.
+ The load is too heavy: Measure the current flowing into the motor and replace the drive with a larger capacity unit if the current value exceeds the rated current of the drive. Reduce the load to avoid sudden changes in the current level or switch to a larger drive.
+ The acceleration or deceleration times are too short: Calculate the torque needed during acceleration relative to the load inertia and the specified acceleration time. Increase the acceleration time (C1-01, -03, -05, -07), increase the S-curve characteristics (C2-01 through C2-04), and increase the capacity of the drive if necessary.
+ The drive is attempting to operate a specialized motor or a motor larger than the maximum size allowed: Check the motor capacity and ensure that the rated capacity of the drive is greater than or equal to the capacity rating found on the motor nameplate.
+ Magnetic contactor (MC) on the output side of the drive has turned on or off: Set up the operation sequence so that the MC is not tripped while the drive is outputting current.
+ V/f setting is not operating as expected: Check the ratios between the voltage and frequency. Set parameter E1-04 through E1-10 appropriately. Set E3-04 through E3-10 when using a second motor. Lower the voltage if it is too high relative to the frequency.
+ Excessive torque compensation: Check the amount of torque compensation. Reduce the torque compensation gain (C4-01) until there is no speed loss and less current.
+ Drive fails to operate properly due to noise interference: Review the possible solutions provided for handling noise interference. Check the control circuit lines, main circuit lines, and ground wiring.
+ Overexcitation gain is set too high: Check if the fault occurs simultaneously with the overexcitation function operation. Consider motor flux saturation and reduce the value of n3-13 (Overexcitation Deceleration Gain).
+ Run command applied while the motor was coasting: Enable Speed Search at start (b3-01 = "1"). Program the Speed Search command input through one of the multi-function contact input terminals (H1-.. = "61" or "62").
+ The wrong motor code has been entered for PM Open Loop Vector (Yaskawa motors only): Enter the correct motor code to E5-01 to indicate that a PM motor is connected.
+ The motor control method and motor do not match: Check which motor control method the drive is set to (A1-02). For IM motors, set A1-02 = "0" or "2". For PM motors, set A1-02 = "5".
+ The motor cable is too long: Use a larger drive.