Trane TVR Pro CO Series Service Manual page 85

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 240-375V. When the voltage is lower than 150V, L1
protection will be appeared.
Yes
No
Yes
No
Yes
1
No
Figure 6-2.6: Inverter module terminals
U V W
Check the power supply
equipment
The reactor performs well
Yes
P
N
84
No Replace the
reactor