Yaskawa VS-616G5 Series Revision F Quick-Start - Manual (Page 71)

68 VS-616G5 Installation & Quick-Start Manual
Motor Faults
If a motor fault occurs, follow the checkpoints listed in the table below and take the corresponding cor-
rective actions. If taking the corrective actions described does not solve the problem, contact your
Yaskawa representative immediately.
Motor Faults and Corrective Actions
Fault Check Point Corrective Action
Motor does not rotate
Power supply voltage applied to power supply ter-
minals L1, L2, L3? Charge LED is ON?
·Turn ON power supply.
·Turn OFF power supply, and then ON again.
·Check power supply voltage.
·Make sure terminal screws are tight.
Use rectifier type voltmeter to test. Voltage output
to output terminals T1, T2, T3 correct?
Turn OFF power supply, then turn ON again.
Motor locks due to excessive load? Reduce the load and release the lock.
Fault displayed in operator display? Check troubleshooting table on page 64.
FWD or REV run command entered? Check the wiring.
Frequency setting voltage entered (when using
terminals 13 or 14)? ·Check the wiring.
·Check frequency setting voltage.
Are reference and run source settings correct?
Check reference and run source selections
(B1-01, B1-02).
Motor rotation reverses
Wiring of terminals T1, T2, T3 correct?
Match wiring to the phase order of the motor
leads T1, T2, T3.
FWD and REV wiring run signals entered? Correct the wiring.
Motor rotates, but vari-
able speed not avail-
able.
Wiring of frequency setting circuit correct? Correct the wiring.
Are reference and run source settings correct?
Check reference and run source selections
(B1-01, B1-02).
Load excessively large? Reduce the load.
Motor rpm too high or
too low
Motor ratings (number of poles, voltage) correct? Check motor nameplate specifications.
Accel/decel speed change ratio for gears, etc.
correct?
Check speed changer (gears, etc.)
Maximum frequency set value correct? Check the maximum frequency set value.
Use rectifier voltmeter. Voltage between motor
terminals not excessively reduced?
Check V/f characteristics values.
Motor rpm not stable
during operation
Load excessively large? Reduce the load.
Load variation excessively large?
·Reduce the load variation.
·Increase inverter motor capacity.
3-phase or single-phase power supply used?
For 3-phase power supply, open phase?
·For 3-phase power supply, check the wiring
if power supply is open phase.
·For single-phase power supply, connect AC
reactor to the power supply.
Chapter 4 - Diagnostics
Alarm & Fault Displays