Midea MV5-X252W/V2GN1 Service Manual page 100

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No
Wires between DC filter board and
inverter module are loose
No
Wires from three-phase bridge rectifier
to reactor, DC filter board and/or AC
filter board are loose
No
The power supply is abnormal
No
Contactor is open
No
Replace three-phase bridge rectifier,
reactor and/or capacitor
Notes:
1. Inverter module voltage monitor ports are ports CN36 and CN38 on the main PCB (labeled 22 and 21, respectively, in Figure 5-2.1 in Part 5, 2.2 "Ports").
The normal voltage between the +15V and N pins is 15V DC. Refer to Figure 5-4.19.
2. Inverter module voltage monitor ports are ports CN36 and CN38 on the main PCB (labeled 22 and 21, respectively, in Figure 5-2.1 in Part 5, 2.2 "Ports").
The normal voltage between the P and N pins should be between 300V and 800V. Refer also to Figure 5-4.19.
Figure 5-4.19: Inverter module voltage monitor ports
CN36: Inverter module A
voltage monitor port
201608
Ensure the wires are
Yes
Ensure the wires are
Yes
connected properly
4
Yes
Yes
neutral terminals on
Wiring connections
300-800V
connected properly
Check the power
supply equipment
Voltage between
power output and
main PCB are
5
220±10%V AC
Yes
at contactor
terminals is(are)
loose
No
The contactor is
blocked
300-800V
15V 15V
V5 X VRF 50/60Hz
Replace
No
outdoor main
PCB
Ensure the
wires are
Yes
connected
properly
Replace the
Yes
contactor
CN38: Inverter module B
voltage monitor port
99