9. Troubleshooting and Maintenance
9-10
14) Motor input current is too large.
① Check the motor wiring.
☞ Check the motor wiring for the use of 220V / 380V transition type motor. (Refer to Main circuit terminal)
② Are motor and inverter capacity set correctly?
③ Is the setting of motor constants appropriate?
☞ Refer to 2) and 9) and check the motor and inverter setting.
15) OC-U (V,W) trip occurs frequently during operation. (Motor input current is oscillating.)
① check the encoder installation.
☞ If encoder connection is poor, motor vibration affects encoder and incorrect encoder signal is input to the
inverter. Vector inverter controls the speed from Encoder F/B value so it follows the input signal whether
correct or not, increasing inverter current. If so, contact motor maker or encoder commission company.
② Is there no inverter output phase loss?
③
Is the motor insulation not damaged?
☞ Refer to 13) and check the inverter and motor.
16) Accel/Decel cannot be made properly and green lamp in [REV], [FWD] key is blinking.
(load and frequency reference signal is oscillating.)
① Check motor wiring.
② FUN_40 ~ FUN_47 Accel/Decel time and DIS_00 motor load.
☞ Blinking Green lamp marks motor is accelerating or decelerating. If the rotating speed oscillates and green
lamp is blinking, it marks inverter output torque shortage due to mis-calculation of load. In this case, increase
the torque limit to enable inverter to accelerate/decelerate within its rating. If load is set too high, it will
shorten inverter life or damage to the unit.
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