Midea MV5-X252W/V2GN1 Service Manual page 60

4.6.4 Procedure
ODU power supply voltage is not within
±10% of rated voltage or a phase is
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
has 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. Refer to Figures 5-1.1 to 5-1.4 in Part 5, 1 "Outdoor Unit Electric Control Box Layout" and to the V5 X Engineering Data Book, Part 2, 5 "Wiring Diagrams".
3. 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. Refer to Figures 5-4.6 and 5-4.7 in Part 5, 4.11.6 "xL0 troubleshooting".
4. 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. Refer to
Part 2, 1 "Layout of Functional Components".
5. Set a multi-meter to buzzer mode and test any two terminals of P N and U V W of the inverter module. If the buzzer sounds, the inverter module has
short-circuited. Refer to Figures 5-1.1 and 5-1.3 in Part 5, 1 "Outdoor Unit Electric Control Box Layout" and to Figure 5-4.1.
201608
E5
1
missing
No
2
No
3
, the fan motor has
4
, or the inverter module
5
No
Figure 5-4.1: Inverter module terminals
U V W
P
Yes
Provide normal power supply
Yes
Ensure the wires are connected properly
Yes
Replace or repair the relevant parts
N
V5 X VRF 50/60Hz
59