Mitsubishi MXZ-4C36NAHZ - Page 122

S R
W V U L2 P N1 L1
122
Outdoor power circuit board
MXZ-4C36NAHZ
MXZ-5C42NAHZ
MXZ-8C48NAHZ
MXZ-8C48NA
MXZ-4C36NAHZ-U1
MXZ-5C42NAHZ-U1
MXZ-8C48NAHZ-U1
MXZ-8C48NA-U1
MXZ-8C60NA-U1
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
-
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.
S R
W V U L2 P N1 L1
CNAC1
208/230 V AC
Connect to the
M-NET power
circuit board
(CN1)
NI, LI
Voltage of 208/230 V AC
is input (Connect to the
terminal block (TB1))
EI, E4
Connect to
the electrical
parts box
DCL1, DCL2
Connect to DCL
U/V/W
Connect to the compres-
sor (MC) Voltage among
phases: 10–180 V AC
CNDC
290–350 V DC (1+, 3−)
Connect to the outdoor
controller circuit board
(CNDC)
E2, E3
Connect to the elec-
trical parts box
CN52C
52C driving signal
Connect to the outdoor
controller circuit board
(CN52)
CN2
Connect to the outdoor 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: 18 V DC
6–5: 16 V DC
7–5: 16 V DC
CN4
Connect to the outdoor
controller circuit board
(CN4)
Power
module
CNAC2
208/230 V AC
Connect to the
outdoor multi
controller circuit
board (CNAC)
OCH573C