Mitsubishi Electric CITY MULTI PUMY-P112VKM6 Service Manual page 96

■ Outdoor power circuit board
PUMY-P112VKM6(-BS)
PUMY-P112VKM6-ER(BS)
PUMY-P125VKM6(-BS)
PUMY-P125VKM6-ER(BS)
PUMY-P140VKM6(-BS)
PUMY-P140VKM6-ER(BS)
CN2
Connect to the outdoor multi controller
circuit board (CN2)
1–5: Transmitting
signal to outdoor controller
circuit board ((0–5 VDC)
2–5: Zero cross signal (0–5 VDC)
3–4: 15 VDC
6–5: 15 VDC
7–5: 15 VDC
TB1B, TB3B, TB2B,
TB1A, TB2A, TB3A
Connect to DCL
CNDC
310–380 VDC (1+, 3−)
Connect to the outdoor
controller circuit board
(CN52)
OCH790 _96
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
R - P1 S - P1 R - N1 S - N1
2 Check of IGBT circuit
P2 - L1 P2 - L2 N2 - L1 N2 - L2
3 Check of INVERTER circuit
P3 - U , P3 - V , P3 - W , N3 - U , N3 - V , N3 - W
Note: The marks R , S , L1 , L2 , P1 , N1 , U , V and W
shown in the diagram are not actually printed on the board.
El, E2, E3, E4
Connect to the electrical parts box
CN6
Thermistor (TH8)
CN4
Connect to the out-
door multi controller
circuit board (CN4)
U/V/W
Connect to the com-
pressor (MC) Voltage
among phases:
10–180 VAC
CNAC2
220-240 VAC
Connect to the out-
door multi controller
circuit board (CNAC)
CNAC1
220-240 VAC
Connect to the
M-NET power circuit
board (CN1)
R/LI, S/NI
Voltage of 220-
240 VAC is input
(Connect to the ter-
minal block (TB1))