34
Installation, Operation and Service Manual
Thermo Scientific XBF40-MD Series Blast Freezers
Appendix
Compressor does not run
1. No power.
2. Low voltage.
3. Inoperative control.
4. Loose wiring at terminals.
5. Inoperative compressor contactor.
6. Open or grounded compressor windings.
7. Defective starting components.
8. Stuck / seized compressor.
1. Check power source. If none, call
qualified electrician.
2. Read supply voltage while unit is
running. Reading must equal rated
±10%.
3. Refer to the controller setup
procedure.
4. Inspect all electrical connections.
5. Start compressor using a
compressor analyzer.
6. Disconnect compressor leads and
read phase to phase and for any
phase to ground. If electrical checks
are OK, then, check the compressor
start gear.
7. Replace starting components.
8. Test by using a compressor
analyzer, if unsuccessful, replace
compressor.
Table 2: Troubleshooting Procedures
SYMPTOM
POSSIBLE CAUSE
TEST AND CORRECTION