MXZ-SM42NAMHZ Service Manual

123
OCH789
P1
S
R
N1
P2
L1
L2
L3
N2
P3
U
V
W
N3
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))
U/V/W
Connect to the com-
pressor (MC) Voltage
among phases:
10–180 V AC
CNDC
290–380 V DC (1+, 3−)
Connect to the outdoor
controller circuit board
(CNDC)
CN2
Connect to the outdoor multi 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: 15 V DC
6–5: 15 V DC
7–5: 15 V DC
CN4
Connect to the out-
door multi controller
circuit board (CN4)
CN6
Thermistor (TH8)
CNAC2
208/230 V AC
Connect to the out-
door multi controller
circuit board (CNAC)
TB1B, TB3B, TB2B,
TB1A, TB2A, TB3A
Connect to DCL
El, E2, E3, E4
Connect to the electrical parts box
Outdoor power circuit board
MXZ-SM36NAM-U1
MXZ-SM48NAM-U1
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.