Midea V6R VRF Series

V6R VRF 50Hz
109
Part
6
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Diagnosis and Troubleshooting
L1: DC bus low voltage protection
Note:
1. The normal DC voltage between terminals P and N on inverter module should be 450-650V. When the voltage is lower than 320V, L1
protection will be appeared.
Figure 6-2.6: Inverter module terminals
8-12HP
14-18HP
L1 protection
The power supply is abnormal
Check the power supply
equipment
No output from bridge rectifier
Replace the inverter module
No
No
No
Yes
Yes
Yes
Yes
The DC bus voltage (P, N) is abnormal
1
The reactor performs well
Replace the
reactor
No
U V W
P
N
U V W
P
N