Mitsubishi Electric Mr. Slim PUHZ-ZRP35VKA Service Manual page 78

Outdoor power circuit board
PUHZ-ZRP100VKA
PUHZ-ZRP125VKA
PUHZ-ZRP140VKA
CN4
Connect to the outdoor
controller circuit board (CN4)
N2
Connect to the smoothing
Power
capacitor CB -
module
W
U/V/W
Connect to the compres-
sor (MC) Voltage among
phases: 10–180 V AC
OCH527C
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
S R
V U L2 P N1 L1
P2 DCL1, DCL2
Connect to the smooth- Connect to DCL
ing capacitor CB +
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: T he marks R , S , L1 , L2 , P , N1 , U , V and W
shown in the diagram are not actually printed on the board.
CN52C CNDC
52C driving signal 280–380 V DC (1+, 3-)
Connect to the outdoor Connect to the outdoor
controller circuit board controller circuit board
(CN52C) (CNDC)
EI, E4 CNAC1, CNAC2
Connect to the 230 V AC
earth Connect to the out-
door controller circuit
board (CNAC)
78
E2, E3
Connect to the earth
NI, LI
Voltage of 230 V AC is
input (Connect to the
terminal block (TB1))