Motor Faults - Saftronics FP5 Series User Manual

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Appendix
Contents

Motor Faults

If a motor fault occurs, follow the checkpoints listed in the table below and
take the corresponding corrective actions. If taking the corrective actions
described does not solve the problem, contact your Saftronics representative
immediately.
Motor Faults and Corrective Actions
Fault
Motor does not
rotate
Motor rotation
reverses
Motor rotates, but
variable speed not
available.
Motor r/min. too high
or too low
Motor r/min not
stable during
operation
92
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 T1, T2, T3 correct?
Motor locks due to excessive load?
Fault displayed in operator display?
FWD or REV run command entered?
Frequency setting voltage entered?
Operation mode setting correct?
Wiring of terminals T1, T2, T3 correct?
FWD and REV wiring run signals entered?
Wiring of frequency setting circuit correct?
Operation mode setting 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 excessive/reduced?
Load excessively large?
Load variation excessively large?
3-phase or single-phase power supply used?
For 3-phase power supply, open phase?
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.
· Check the wiring.
· Check frequency setting voltage.
Check the operation mode selection
(n002).
Match wiring to the phase order of the
motor leads U, V, W.
Correct the wiring.
Check the operation mode selection
(n002).
Check the operation mode selection
(n002).
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.
FP5/GP5 User's Manual