Wellea Monobloc
92
L1/L2 troubleshooting
4.21.7
The normal DC voltage between terminals P and N on inverter module is 540V. If the voltage is lower than 300V, the unit
displays an L1 error; if the voltage is higher than 800V, the unit displays an L2 error. Refer to Figure4-4.7.
Situation 1: L1 or L2 error appears immediately after the outdoor unit is powered-on
L1 / L2
P N +15V wire on refrigerant system main
PCB is not connected properly
1
Yes
Ensure P N +15V wire is connected
properly
No
Voltage between N and +15 is abnormal
2
Yes
Check +15V circuit
3
No
DC voltage between terminal P and N is
abnormal
Yes
Check power supply, three phase bridge
rectifier
4
No
Replace the main PCB
Notes:
1.
P N +15V terminal on refrigerant system main PCB. Refer to Figure4-4.7.
2.
Voltage between N and +15. Refer to Figure4-4.8
Figure 4-4.7: P, N terminals voltage
V
normal
= 540V DC
Figure 4-4.8: P N +15V terminal
V
normal
= 15V
