Applicable Systems
CJ/CS Series
Symptoms
The CJ/CS Series reports a short circuit fault. A short circuit was detected between motor output phases or between phase and ground.
Possible Causes
- Short circuit between motor output cables U, V, or W
- Motor winding phase-to-phase short circuit
- Power semiconductor failure causing internal short circuit
Troubleshooting Steps
- Step 1: Disconnect the motor cable and measure resistance between all phases
No short circuits found between phases - Step 2: Test the motor winding resistance between all phase pairs
Motor windings show balanced resistance - Step 3: If the drive output is shorted internally, replace the drive unit
New drive has no internal short circuits
How to Reset
To reset: Eliminate the short circuit, then reset the fault and restart.
Source: Omron CJ/CS Series PLC Programming Manual, Omron Corporation
Category: PLC & VFD