Hi

I've got a job driving me mad atm.

Single phase Copeland scroll, compressor starts and runs for a short period and then turns off (internal o/load) C-R open circuit.

I have checked the wiring against our diagram below on the soft start PCB and It is correct.

When the compressor was running before it cut off I noted the run current as approx:
Run connection-2~
Start connection to cap-11~
Contactor to common- 8~

I disconnected the start capacitor once the comp was running and the compressor kept going with no problems.

The run connection current went up to 10~ and the pot seemed much smoother.

I'm guessing the soft start PCB isn't switching the start winding out? Any thoughts would be appreciated as it seems to be happening on two identical units!!





image1.PNG