Brief Check Of Power Module - Mitsubishi Electric PUHZ-SW75VHA Service Manual

Outdoor power circuit board
PUHZ-SW100VHA.UK
PUHZ-SW100VHA-BS.UK
PUHZ-SW120VHA.UK
PUHZ-SW120VHA-BS.UK
CN4
Connect to the outdoor
controller circuit board (CN4)
N2
Connect to the smoothing
capacitor CB -
Power module
W
U/V/W
Connect to the compres-
sor (MC) Voltage among
phases: 10 V-180 V AC
OCH533A
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: 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
Connect to the
earth
49
CNDC
280-380 V DC (1+, 3-)
Connect to the outdoor
controller circuit board
E2, E3
(CNDC)
Connect to the earth
CNAC1, CNAC2
NI, LI
230 V AC Voltage of 230 V AC is
Connect to the out- input (Connect to the ter-
door controller circuit minal block (TB1))
board (CNAC)