Motor Faults And Corrective Actions - YASKAWA VS?616G5 Owner's Manual

7.2

MOTOR FAULTS AND CORRECTIVE ACTIONS

(1) If any of the following faults occurs in the motor, check the cause and provide the relevant
corrective action.
(2) If these inspections and corrective actions cannot solve the problem, contact your YASKAWA
representative immediately.
Table 32
Fault
Motor does not rotate. Motor locks due to excessive load?
Motor does not rotate.
Motor rotation
reverses reverses.
M Motor rotates, but
variable speed not
available. available.
Motor r/min too high
or too low. or too low
Motor r/min not
stable during stable during
operation.
Motor Faults and Corrective Actions
Check Point
Power supply voltage applied to power supply
terminals L1, L2, L3 ? CHARGE LED is ON ?
Use rectifier type voltmeter to test. Voltage
output to output terminals U(T1), V(T2), W(T3)
correct?
Fault displayed in operator display?
FWD or REV run command entered?
Frequency setting voltage entered?
Reference selection (b1−01), operation method
selection (b1−02) correct?
Wiring of terminals U(T1), V(T2), W(T3)
correct?
FWD and REV wiring run signals entered?
Wiring of frequency setting circuit correct?
b
Reference selection (b1−01), operation method
selection (b1−02) correct?
Load excessively large?
Motor ratings (number of poles, voltage)
correct?
Accel/decel speed change ratio for gears, etc.
correct?
Maximum frequency set value correct?
Use rectifier voltmeter. Voltage between motor
terminals not excessively reduced?
Load excessively large?
Load variation excessively large?
3−phase or single−phase power supply used?
For 3−phase power supply, open phase?
7 TROUBLESHOOTING
Corrective Action
⋅Turn ON power supply.
⋅Turn OFF power supply, and then ON again.
⋅Check power supply voltage.
⋅Make sure terminal screws are tight.
Turn OFF power supply, then turn ON again.
Reduce the load and release the lock.
Check troubleshooting table.
Check the wiring.
⋅Correct the wiring.
⋅Check frequency setting voltage.
Input the correct set value.
Match wiring to the phase order of the motor
leads U(T1), V(T2), W(T3) .
Correct the wiring.
Correct the wiring.
With the digital operator, check the reference
selection or operation method selection.
Reduce the load.
Check motor nameplate specifications.
Check speed changer (gears, etc.)
Check the maximum frequency set value.
Check V/f characteristics values.
Reduce the load.
⋅Reduce the load variation.
⋅Increase inverter motor capacity.
⋅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.
67