Mitsubishi Electric PUHZ-W50VHA2R1 Service Manual page 30

Outdoor power circuit board
PUHZ-W50VHA2
PUHZ-W50VHA2R1
PUHZ-W50VHA2-BS
PUHZ-W50VHA2R1-BS
U, V, W
Connect to the
compressor (MC)
Voltage among phases:
IGBT (Q600)
10–180 V AC
P1 L L N1
CNDC
Diode bridge
280–380 V DC
(DB1, DB2)
Connect to the outdoor
controller circuit board
(CNDC)
OCH605A
Brief Check of DIP-IPM and D.B.
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
P2 - U , P2 - V , P2 - W , N2 - U , N2 - V , N2 - W
2. Check of IGBT (Q600)
DB3 + - DB3 −
3. Check of diode bridge
P2 - L , P2 - N , N2 - L , N2 - N
CN4
Connect to the
DIP-IPM
outdoor controller
circuit board (CN4)
N1 N N P1
+ −
CN2
TBL2, TBL4
Connect to the outdoor controller circuit board (CN2)
Connect to ACL
1–5: Outdoor power circuit board
2–5: Zero cross signal (0–5 V DC)
3–4: 15 V DC
6–5: 16 V DC
7–5: 16 V DC
Note: The marks N1 , N2 , P1 , P2 , U , V , W , L , N , + and −
shown in the diagram are not actually printed on the board.
CNAC1, CNAC
Connect to the out-
CN6
door controller circuit
Thermistor (TH8)
board (230 V AC)
<Heat sink>
nal to the outdoor controller circuit board (0–5 V
DC)
[
1, 2, 6, 7 : +
5 : –
30
R/L1, S/N1
Voltage of 230 V AC
is input. (Connect to the
terminal block (TB1))
E4
Connect to the
earth
Transmitting sig-
→
]
EI, E3
Connect to
the earth