MXZ-SM36NAMHZ Service Manual

122
OCH789
P1 R
S N1
N2
L2 P2
L3 L1
N3
V P3
W U
CNDC
290–380 V DC (1+, 2−)
Connect to the outdoor
multi controller circuit
board (CNDC)
E5
Connect to the electrical
parts box
CN2
Connect to the outdoor
multi controller circuit
board (CN2)
1–5: Transmitting sig-
nal to outdoor
controller circuit
board ((0–5 V
DC)
2–5: Zero cross sig-
nal (0–5 V DC)
3–4: 15 V DC
6–5: 15 V DC
7–5: 15 V DC
CN4
Connect to the outdoor
multi controller circuit
board (CN4)
CN6
Thermistor (TH8)
TB1A, TB2A, TB3A,
TB1B, TB2B, TB3B
Connect to DCL
TB-U, TB-V, TB-W
Connect to the compres-
sor (MC)
Voltage among phases:
10-180 V AC
TB3, TB4
Voltage of 208/230 V AC
is input
(Connect to the outdoor
noise filter board (TB1,
TB2))
Outdoor power circuit board
MXZ-SM60NAM-U1
MXZ-SM36NAMHZ-U1
MXZ-SM42NAMHZ-U1
MXZ-SM48NAMHZ-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
-
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.