Digital Operator Display Fault NameFbHExcessive PID FeedbackPID feedback input is greater than the level set to b5-36 for longer than the time set to b5-37. Set b5-12to 2 or 5 to enable fault detection.Cause Possible SolutionParameters are set inappropriately Check b5-36 and b5-37 settings.Incorrect PID feedback wiring Correct the wiring.There is a problem with the feedback sensor • Check the sensor on the control side.• Replace the sensor if damaged.Digital Operator Display Fault NameFbLPID Feedback LossPID feedback loss detection is programmed to trigger a fault (b5-12 = 2 or 5) and the PID feedback levelis below the detection level set to b5-13 for longer than the time set to b5-14.Cause Possible SolutionParameters are set inappropriately Check b5-13 and b5-14 settings.Incorrect PID feedback wiring Correct the wiring.There is a problem with the feedback sensor • Check the sensor on the control side.• Replace the sensor if damaged.Digital Operator Display Fault NameGFGround Fault• A current short to ground exceeded 50% of rated current on the output side of the drive.• Setting L8-09 to 1 enables ground fault detection.Cause Possible SolutionMotor insulation is damaged • Check the insulation resistance of the motor.• Replace the motor.A damaged motor cable is creating a shortcircuit• Check the motor cable.• Remove the short circuit and reapply power to the drive• Check the resistance between the cable and the ground terminal .• Replace the cable.Excessive leakage current at the drive output • Reduce the carrier frequency.• Reduce the amount of stray capacitance.The drive started to run during a current offsetfault or while coasting to a stop• Set b3-01 to 1 to enable Speed Search at Start.• Perform Speed Search 1 or 2 (H1-oo = 61 or 62) via one of the external terminals.Hardware problem If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawarepresentative for instructions on replacing the control board.Digital Operator Display Fault NameLFOutput Phase Loss• Phase loss on the output side of the drive.• Setting L8-07 to 1 or 2 enables Phase Loss Detection.Cause Possible SolutionThe output cable is disconnected • Check for wiring errors and properly connect the output cable.• Correct the wiring.The motor winding is damaged • Check the resistance between motor lines.• Replace the motor if the winding is damaged.The output terminal is loose • Apply the tightening torque specified in this manual to fasten the terminals. Refer to Main CircuitWire Gauges and Tightening Torques on page 85 for details.The rated current of the motor being used isless than 5% of the drive rated current Check the drive selection and motor capacities.An output transistor is damaged If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawarepresentative for instructions on replacing the control board.A single-phase motor is being used The drive cannot operate a single phase motor.6.4 Fault DetectionYASKAWA SIEP YAIP1U 01C AC Drive - P1000 Technical Manual 2996 Troubleshooting
