Mitsubishi Electric City Multi PUMY-SP112VKM Technical & Service Manual page 112

Outdoor power circuit board
PUMY-SP112VKM(R1).TH
PUMY-SP112VKM(R1).TH-BS PUMY-SP125VKM(R1).TH-BS
CN2
Connect to the outdoor controller circuit
board (CN2)
5: Transmitting signal to outdoor con-
–
1
troller circuit board (0 5 V DC)
–
5: Zero cross signal (0 5 V DC)
– –
2
4: 16 V DC
–
3
5: 16 V DC
–
6
5: 16 V DC
–
7
TB1A, TB2A, TB3A,
TB1B, TB2B, TB3B
Connect to DCL
CNDC
280–380 V DC (1+, 3−)
Connect to the out-
door controller circuit
board (CNDC)
OCH668B
PUMY-SP125VKM(R1).TH
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 - P1 S - P1 R - N1 S - N1
2 Check of IGBT circuit
P2 - L1, P2 - L2, P2 - L3, N2 - L1, N2 - L2, N2 - L3
3 Check of INVERTER circuit
P3 - U , P3 - V , P3 - W , N3 - U , N3 - V , N3 - W
Note: T he marks R , S , L1 , L2 , L3 , P1 , P2 , P3 , N1 , N2 , N3 , U , V and W
shown in the diagram are not actually printed on the board.
EI, E3, E4
Connect to the electrical parts box
PUMY-SP140VKM(R1).TH
PUMY-SP140VKM(R1).TH-BS
112
CN6
Thermistor
CN4
Connect to the outdoor
controller circuit board
(CN4)
U/V/W
Connect to the com-
pressor (MC)
Voltage amang
phases: 10-180V AC
CNAC1
230 V AC
Connect to the M-NET
power circuit board (CN1)
CNAC2
230 V AC
Connect to the outdoor multi
controller circuit board (CNAC)
NI, LI
Voltage of 230
V AC is input
(Connect to the
terminal block
(TB1))