Mitsubishi Electric PUZ-A18NHA2 Service Manual page 68

Outdoor power circuit board
PUZ-A18NHA2
PUZ-A18NHA2-BS
PUY-A12/18NHA2
PUY-A12/18NHA2-BS
LD1-LD2
280-380V DC
Connect to
the outdoor
controller
circuit board
(CNDC)
CN2
Connect to the outdoor controller circuit board (CN2)
1-5:Outdoor power circuit board
to the outdoor controller circuit board (0-5V DC)
2-5: Zero cross signal (0-5V DC)
3-4: Not used
[
1, 2, 6, 7 : +
6-5: 16V DC
7-5: 16V DC
Brief check of DIP-IPM and DIP-PFC
W Usually, they are in a state of being short-circuited if they are broken.
Measure the resistance in the following points (connectors, etc.). If they
are short-circuited, it means that they are broken.
1. Check of DIP-IPM
P-U, P-V, P-W, N-U, N-V, N-W
2. Check of DIP-PFC
P-R, P-S, R-N, S-N
➔
Transmitting signal
]
5 : –
R, S U, V, W
Connect to the ACL Connect to the compressor (MC)
208/230V AC Voltage among phases: 5V to 180V AC
CN3 CN4
Thermistor Connect from the
<Heatsink> outdoor controller
(TH8) circuit board
(CN4)
68
DIP-PFC
LD9
Connect to
the earth
Only A24
DIP-IPM
CN5
Primary current detection
(Connect to the outdoor
noise filter circuit board
(CN5))