Mitsubishi Electric PUMY-P36NKMU4 Technical & Service Manual page 122

Outdoor power circuit board
PUMY-P36NKMU4
PUMY-P48NKMU4
CN2
Connect to the outdoor multi controller
circuit board (CN2)
– : Transmitting
signal to outdoor controller
circuit board ((0–5 V DC)
– : Zero cross signal (0–5 V DC)
– : 15 V DC
– : 15 V DC
– : 15 V DC
TB1B, TB3B, TB2B,
TB1A, TB2A, TB3A
Connect to DCL
CNDC
290–380 V DC ( +, −)
Connect to the outdoor
controller circuit board
(CNDC)
OCH811A
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
Check of DIODE circuit
R - P1 S - P1 R - N1 S - N1
Check of IGBT circuit
P2 - L1 P2 - L2 N2 - L1 N2 - L2
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, E3, E4
Connect to the electrical parts box
122
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 V AC
CNAC2
208/230 V AC
Connect to the out-
door multi controller
circuit board (CNAC)
CNAC1
208/230 V AC
Connect to the
M-NET power circuit
board (CN1)
R/LI, S/NI
Voltage of 208/230 V
AC is input (Connect
to the terminal block
(TB1))