Sinclair SCV-750EB Service Manual page 143

6.3 L11: Software overcurrent
Description
The current exceeds the OCP protection value (peak value) set by the software;

After the fault, the compressor stops running. If the fault disappears after one minute, the compressor starts again.

Trigger/resume condition
Trigger condition: It is detected that the compressor current exceeds the OCP protection value set by the software for three

consecutive carrier cycles.
Resume condition: The compressor shuts down after a fault, and resumes after reaching the fault exit condition one minute

later.
Reset method: Automatic recovery after reaching the fault exit condition one minute later.

Possible causes
 There are impurities in the refrigerant system or the compressor is momentarily stuck, causing the current surge to trigger
OCP;
Module board Icd op amp sampling circuit is abnormal.

Procedure
Drive board fault(swap the drive board to judge)
Impurities in the refrigerant system or the
compressor is momentarily stuck (noise when
L11
NO
running or starting)
Yes
Change the drive board
Yes
Change the compressor
End
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