S R
W V U L2 P N1 L1
Brief Check of POWER MODULE
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 POWER MODULE
1 Check of DIODE circuit
R - L1 , S - L1 , R - N1 , S - N1
2 Check of IGBT circuit
L2 - N1
3 Check of INVERTER circuit
P - U , P - V , P - W , N1 - U , N1 - V , N1 - W
Note: The marks R , S , L1 , L2 , P , N1 , U , V and W
shown in the diagram are not actually printed on the board.
66
Outdoor power circuit board
PUHZ-SP100VHA.UK
PUHZ-SP125VHA.UK
PUHZ-SP140VHA.UK
CNAC1, CNAC2
230 V AC
Connect to the
outdoor controller
circuit board (CNAC)
NI, LI
Voltage of 230 V AC is
input (Connect to the
terminal block (TB1))
EI, E4
Connect to
the earth
DCL1, DCL2
Connect to DCL
P2
Connect to the
smoothing capacitor
CB +
U/V/W
Connect to the
compressor (MC)
Voltage among phases:
10–180 V AC
CNDC
280–380 V DC (1+, 3−)
Connect to the outdoor
controller circuit board
(CNDC)
E2, E3
Connect to the earth
CN52C
52C driving signal
Connect to the outdoor
controller circuit board
(CN52C)
CN2
Connect to the outdoor controller circuit board (CN2)
1–5: Transmitting signal to outdoor controller circuit board (0−5 V DC)
2–5: Zero cross signal (0–5 V DC)
3–4: 18 V DC
6–5: 16 V DC
7–5: 16 V DC
N2
Connect to the smoothing
capacitor CB −
CN4
Connect to the outdoor
controller circuit board (CN4)
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