Mitsubishi Electric EHST20C-VM6HB Service Manual page 53

Outdoor power circuit board
PUHZ-SW75VHA.UK
PUHZ-SW75VHAR3.UK
PUHZ-SW75VHA-BS.UK
PUHZ-SW75VHAR3-BS.UK
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
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: 16V DC
7–5: 16 V DC
OCH533D
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
2. Check of DIP-PFC
Note:The marks L , N , N1 , N2 , P1 , P2 , U , V and W shown
in the diagram are not actually printed on the board.
Transmitting signal
→
]
5 : –
P2 - U , P2 - V , P2 - W , N2 - U , N2 - V , N2 - W
P1 - L , P1 - N , L - N1 , N - N1
R, S
Connect to the ACL
230 V AC
P1 N L
N2 W
CN3 CN4
Thermistor Connect from the
<Heat sink> outdoor controller
(TH8) circuit board
(CN4)
53
U, V, W
Connect to the compressor (MC)
Voltage among phases: 5 to 180 V AC
N1 N1
V U P2
CN5
Primary current detection
(Connect to the outdoor
noise filter circuit board
(CN5))
DIP-PFC
LD9
Connect to
the earth
DIP-IPM