Noise - Mitsubishi PUZ-A18NHA6 Service Manual

Outdoor power circuit board
PUZ-A18NHA6
PUZ-A18NHA6-BS
PUY-A12/18NHA6
PUY-A12/18NHA6-BS
LD1-LD2
280–380 V DC
Connect to
the outdoor
controller
circuit board
(CNDC)
CN2
Connect to the outdoor controller circuit board (CN2)
1–5: Outdoor power circuit board→Transmitting signal
to the outdoor controller circuit board (0–5 V DC))
2–5: Zero cross signal (0–5 V DC)
[
3–4: Not used
1, 2, 6, 7 : +
6–5: 16 V DC
7–5: 16 V DC
OCH577A
Brief check of DIP-IPM and DIP-PFC
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
]
5 : –
R, S U, V, W
Connect to the ACL Connect to the compressor (MC)
208/230 V AC Voltage among phases: 5 to 180 V AC
CN3 CN4
Thermistor Connect from the
<Heat sink> outdoor controller
(TH8) circuit board
(CN4)
74
DIP-PFC
LD9
Connect to
the earth
Only A24
DIP-IPM
CN5
Primary current detection
(Connect to the outdoor
noise filter circuit board
(CN5))