Sinclair SCV-750EB Service Manual page 98

L2: High-voltage protection
The power supply is abnormal
DC bus voltage(P, N) is abnormal
Power supply for compressor module
board is abnormal
Change compressor module board
Note:
1. The normal DC voltage between terminals P and N on inverter module should be 450-650V. When the voltage is higher than 800V, L2 protection will be
appeared.
96
L2
No
Yes
No
Yes
Check the power supply equipment
No
Change compressor module board
Check the wire connection between power
supply terminals and filter board; Check the
Yes
wire connection between filter board to
compressor module board