Midea MV5-X252W/V2GN1 - Page 100

V5 X VRF 50/60Hz
201608 99
Part 5 - Diagnosis and Troubleshooting
… flowchart continued from previous page
No
Wires between DC filter board and
inverter module are loose
Yes
Ensure the wires are
connected properly
No
Wires from three-phase bridge rectifier
to reactor, DC filter board and/or AC
filter board are loose
4
Yes
Ensure the wires are
connected properly
No
The power supply is abnormal
Yes
Check the power
supply equipment
No
Contactor is open
Yes
Voltage between
power output and
neutral terminals on
main PCB are
220±10%V AC
5
No
Replace
outdoor main
PCB
Yes
Wiring connections
at contactor
terminals is(are)
loose
Yes
Ensure the
wires are
connected
properly
No
No
The contactor is
blocked
Yes
Replace the
contactor
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
CN38: Inverter module B
voltage monitor port
15V
300-800V
15V
300-800V