Mitsubishi Electric Mr.Slim PUHZ-SHW80VHA Service Manual page 56

Outdoor power circuit board
PUHZ-SHW80VHA
PUHZ-SHW112VHA
CN4
Connect to the outdoor
controller circuit board (CN4)
N2
Connect to the smoothing
Power
capacitor CB -
module
W V
U/V/W
Connect to the compres-
sor (MC) Voltage among
phases: 10 V-180 V AC
OCH526
Brief Check of POWER MODULE
* Usually, they are in a state of being short-circuited if they are broken.
1. Check of POWER MODULE
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
U L2 P N1 L1
P2 DCL1, DCL2
Connect to the smooth- Connect to DCL
ing capacitor CB +
Measure the resistance in the following points (connectors, etc.).
If they are short-circuited, it means that they are broken.
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.
CN52C
52C driving signal
Connect to the outdoor
controller circuit board
(CN52C)
EI, E4 CNAC1, CNAC2
Connect to the 230 V AC
earth Connect to the out-
door controller circuit
board (CNAC)
56
CNDC
280-380 V DC (1+, 3-)
Connect to the outdoor
E2, E3
controller circuit board
(CNDC) Connect to the earth
NI, LI
Voltage of 230 V AC is
input (Connect to the ter-
minal block (TB1))