Trane TVR Pro CO Series Service Manual page 83

L2: DC bus high voltage protection
L2 protection
The power supply is abnormal
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 higher than 700V, L2
protection will be appeared.
Yes
No
Yes
1
No
Figure: Inverter module terminals
Check the power supply
equipment
Replace the 3-phase bridge
rectifier
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