L2: Dc Bus High Voltage Protection - Midea VRF Series Service Manual

V6R VRF 50/60Hz

L2: DC bus high voltage protection

L2 protection
The power supply is abnormal
No
The DC bus voltage (P, N) is abnormal
No
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 higher than 700V, L2
protection will be appeared.
Figure 6-2.7: Inverter module terminals
110
Yes
Yes
1
8-12HP
U V W
Check the power supply
equipment
Replace the 3-phase bridge
rectifier
P
N
U V W
14-18HP
P
N