Applicable Systems
Octagon 4-Comp
Symptoms
The compressor reports a phase sequence error. The controller detected incorrect phase rotation, preventing compressor startup.
Possible Causes
- Power supply phase rotation reversed
- Wiring error during installation or maintenance
- Phase loss detected during phase monitoring
Troubleshooting Steps
- Step 1: Check phase rotation at the compressor power supply
Correct L1-L2-L3 rotation is confirmed - Step 2: Verify all three phases have equal voltage
Phase-to-phase voltages are balanced within 3 percent - Step 3: Correct the wiring if the phase sequence is reversed
Phase rotation tester shows correct direction
How to Reset
To reset: Correct the phase sequence and verify all phases, then cycle the controller power.
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Source: Bitzer Screw Compressor Operating Instructions, Bitzer Kuhlmaschinenbau GmbH
Category: Refrigeration
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