L1: Dc Bus Low Voltage Protection; Inverter Module Terminals - Midea VRF Series Service Manual

L1: DC bus low voltage protection

L1 protection
The power supply is abnormal
No output from bridge rectifier
The DC bus voltage (P, N) is abnormal
Replace the inverter module
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
No
No
1
No
8-12HP
U V W
Yes Check the power supply
equipment
Yes
Yes
The reactor performs well
Yes
P
N
U V W
V6R VRF 50/60Hz
No Replace the
reactor
14-18HP
P
N
109