Mitsubishi Electric PUHZ-W50VHA Service Manual page 80

Outdoor power circuit board
PUHZ-HW140VHA2R5(-BS)
PUHZ-HW140VHA2R6(-BS)
PUHZ-HW140VHA2R7(-BS)
CN4
Connect to the outdoor
controller circuit board (CN4)
Power
module
W W
U/V/W
Connect to the compres-
sor (MC) Voltage among
phases: 10–180 V AC
OCH439M
Brief Check of POWER MODULE
If they are short-circuited, it means that they are broken.
Measure the resistance in the following points (connectors, etc.).
1. Check of POWER MODULE
1 Check of DIODE circuit
2 Check of IGBT circuit
L2 - N1
3 Check of INVERTER circuit
Note: The marks R , S , L1 , L2 , P , N1 , U , V and W
CN2
Connect to the outdoor controller circuit board (CN2)
1–5: Transmitting signal to outdoor controller circuit
board (0
2–5: Zero cross signal (0
3–4: 18 V DC
6–5: 16 V DC
7–5: 16 V DC
CN52C
52C driving signal
Connect to the outdoor
controller circuit board
(CN52C)
S S R R
P
V V U U L2 N1 N1 L1 L1
DCL1, DCL2
Connect to DCL
R - L1 , S - L1 , R - N1 , S - N1
P - U , P - V , P - W , N1 - U , N1 - V , N1 - W
shown in the diagram are not actually printed on the board.
5 V DC)
–
5 V DC)
–
CNDC
280–380 V DC (1+, 3−)
Connect to the outdoor
controller circuit board
(CNDC)
CNAC1, CNAC2
EI, E4
230 V AC
Connect to the
Connect to the out-
earth
door controller circuit
board (CNAC)
80
E2, E3
Connect to the earth
NI, LI
Voltage of 230 V AC is
input (Connect to the
terminal block (TB1))