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5.5.3 Troubleshooting an Open Interlock
1. Verify the interlock. Refer to "4.4.2.3 Interlock Verification" on page 65.
2. Ensure there is 0VDC (no external power applied) on the interlock circuit.
3. If the Interlock circuit is determined damaged and will not close, remove the wire from the I/
LOCK-(neg) at the J2 connector of the I/O Board.
4. Move the wire to the SPEED-(neg) at the J2 connector of the I/O board.
5. This will allow the interlock circuit to close until a replacement BMCC is installed.
6. After replacing the BMCC (see Section 3.14.4), replace the wire to the I/LOCK-(neg) at the J2
connector of the I/O board.
5.5.4 Troubleshooting the Inverter
1. Download the fault and event log.
2. Review the fault and event log for any “Inverter Error Signal Active” faults.
• Presence of an “Inverter Error Signal Active” fault indicates failure of the Inverter. Replace
the Inverter.
• If no “Inverter Error Signal Active” fault is present, continue with the next step.
3. Verify the Inverter.
4. If the Inverter verification passes, but he compressor will not run, refer to Stator insulation
verification and Stator resistance verification.
• • • CAUTION • • •
Repeated rotor may be locked or single phase over current faults can cause shaft demagnetization. It is important to repair an
Inverter failure before the compressor is damaged beyond field repair.
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