54
Outdoor power circuit board
PUHZ-SW75VHAR4.UK
PUHZ-SW75VHAR4-BS.UK
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
Note: The marks N1 , N2 , P1 , P2 , U , V , W , L , N , + and −
shown in the diagram are not actually printed on the board.
CN2
Connect to the outdoor controller circuit board (CN2)
1–5: Outdoor power circuit board
→ Transmitting sig-
nal to the outdoor controller circuit board (0–5 V
DC)
2–5: Zero cross signal (0–5 V DC)
3–4: 15 V DC
6–5: 16 V DC
7–5: 16 V DC
1, 2, 6, 7 : +
5 : –
]
[
U, V, W
Connect to the
compressor (MC)
Voltage among phases:
10–180 V AC
CN4
Connect to the
outdoor controller
circuit board (CN4)
E4
Connect to the
earth
EI, E3
Connect to
the earth
CNAC1, CNAC
Connect to the out-
door controller circuit
board (230 V AC)
R/L1, S/N1
Voltage of 230 V AC
is input. (Connect to the
terminal block (TB1))
CNDC
280–380 V DC
Connect to the outdoor
controller circuit board
(CNDC)
TBL2, TBL4
Connect to ACL
N1 P1
CN6
Thermistor (TH8)
<Heat sink>
N2P2 V
U W
DIP-IPM
IGBT (Q600)
N
N
+
−
P1 N1
L
L
Diode bridge
(DB1, DB2)
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