Sinclair SCV-EB Series Service Manual page 76

Inverter Module(12-16KW): LED1
5.28.3 Principle of DC inverter
Power
supply
(220V)
①Contactor is open, the current across the PTC to charge capacitor. After 5 seconds, the contactor closed.
②220-240V AC power supply change to DC power supply after bridge rectifier.
③The capacitor output steady power supply for inverter module P N terminals. In standby the voltage between P and N
terminal on inverter module is 1.4 time of AC power supply. When the fan motor is running, the voltage is 380V DC.
5.28.4 L0/L4 troubleshooting
Situation 1: L0 or L4 error appears immediately after the compressor starts up
U V W wire between inverter module and
compressor is not connected properly
Inverter module is damaged
Compressor has malfunctioned
74
L PTC
Bridge
Contactor
rectifier
N
○,
1
L0 / L4
No
2
No
4
No
Inductor
Capacitor
PFC
○,
2
Yes
Ensure U V W wire is connected properly
1
Yes
Replace the inverter module
Yes
P
U
Inverter Comp
V
W
module ressor
N
○,
3
Replace the compressor
3