Sinclair SCV-1400EB, Service Manual

Page: 149 / 160

147
Possible causes

The main controller's capacity dial or model dial is set incorrectly;

The matching model of the module board is incorrectly selected;

The main board circuit or the module board circuit is abnormal.
Procedure
L45
Spot check whether the unit model matches the dial
code of the model on the main control board
No
reset model dial
Yes
Whether the model of the module board matches
the model of the compressor
Yes
Change the driver board
6.11
L46: IPM protection (FO)
Description

The FO signal of the IPM module has a falling edge or a continuous low level.

After the fault, the compressor stops running, and if the fault disappears after one minute, the compressor starts again.
Trigger/resume condition

Trigger condition: The FO signal of the IPM module has a falling edge or a continuous low level.
 Resume condition: The FO signal of the IPM module turns into high level.

Reset method: Automatic recovery after reaching the fault exit condition one minute later.
Possible causes

Internal short circuit of the IPM module;

Short circuit of compressor winding;
 System condensation results in short circuit of IPM module pins;

The drive voltage of the lower bridge IGBT of the IPM module is lower than 10.3V;

The module board is abnormal.
Procedure
L46
Report error while in standby
Yes
Change the drive board
NO
Compressor winding and insulation failure
Yes
Change the compressor
NO
Replace the drive board of the matching model
6.12
L47: Module type not match
Description
 The driver board detected by the module detection resistor does not match the setting in the driver parameter table.
Trigger/resume condition

Trigger condition: The current level of the drive board and the compressor information detected by the module detection
resistor do not match the settings in the drive parameter table.

Resume condition: Change the module board.
 Reset method: Re-select the module board corresponding to the model, then power off and restart.
Possible causes

The main control capacity dial code and model selection are wrong;