Specifications

Chapter 8: Troubleshooting
Firmware – S2011 and S3012
Revision: 1 (9/98) 70 © Saftronics, Inc.
8.3 Motor Faults and Corrective Actions
§ If any of the following faults occurs in the motor, check the cause and provide the relevant corrective action.
§ If these inspections and corrective actions cannot solve the problem, contact your Saftronics representative immediately.
Table 22 Motor Faults and Corrective Actions
Fault Check Point Corrective Action
Power supply voltage applied to power
supply Terminals L1, L2, and L3 (R, S, and
T)? Is CHARGED LED 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. Is
voltage output to output Terminals T1, T2
and T3 (U, V, and W) 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 Digital Operator display? Check troubleshooting table.
FWD or REV RUN command entered? Check the wiring.
Frequency setting voltage entered?
• Correct the wiring.
• Check frequency setting voltage.
Motor does not rotate.
Operation mode setting (n002) correct? Input the correct the set value.
Wiring of Terminals T1, T2, and T3 (U, V,
and W) correct?
Match wiring to the phase order of the motor
leads T1, T2, and T3 (U, V, and W).
Motor rotation reverses.
FWD and REV wiring run signals entered? Correct the wiring.
Wiring of frequency setting circuit correct? Correct the wiring.
Operation mode setting (n002) correct?
With the Digital Operator, check the operation
mode selection.
Motor rotates, but variable
speed not available.
Load excessively large? Reduce the load.
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.
Motor RPM too high or too low.
Use rectifier voltmeter. Voltage between
motor terminals not excessively reduced?
Check V/f characteristics values.
Load excessively large? Reduce the load.
Load variation excessively large?
• Reduce the load variation.
• Increase Inverter motor capacity.
Motor RPM not stable during
operation.
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.
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