Trane TVR Pro CO Series Service Manual page 65

Procedure
ODU power supply is abnormal or a
Wires between outdoor main PCB, AC
filter boards and electric control box
power supply terminals are loose
High voltage circuit error has occurred,
such as the compressor has
malfunctioned
short-circuited
Replace outdoor main PCB
Notes:
1. The normal voltage between A and N, B and N, and C and N is 198-242V.
2. The normal resistances of the inverter compressor are 0.7-1.5Ω among U V W and infinite between each of U V W and ground. If any of the resistances
differ from these specifications, the compressor has malfunctioned.
3. The normal resistances of the fan motor coil among U V W are less than 10Ω. If a measured resistance is 0Ω, the fan motor has short-circuited.
4. Set a multi-meter to buzzer mode and test any two terminals of P N U V W of the inverter module. If the buzzer sounds, the inverter module has
short-circuited.
E5
phase is missing 1
No
No
2 , the fan motor has
3 , or the inverter module
has short-circuited
4
No
Figure: Inverter module terminals
Yes
Provide normal power supply
Yes
Ensure the wires are connected properly
Yes
Replace or repair the relevant parts
64