Mitsubishi Electric PUHZ-W50VHA Service Manual page 81

Outdoor power circuit board
PUHZ-HW112YHA(-BS)
PUHZ-HW112YHA2(-BS)
PUHZ-HW112YHA2R1(-BS)
PUHZ-HW112YHA2R3(-BS)
PUHZ-HW112YHA2R4(-BS)
PUHZ-HW140YHA(-BS)
PUHZ-HW140YHA2(-BS)
PUHZ-HW140YHA2R1(-BS)
PUHZ-HW140YHA2R3(-BS)
PUHZ-HW140YHA2R4(-BS)
CN5
CN4
Detection of
Connect to the
primary current
outdoor controller
(Connect to the
circuit board
outdoor noise filter
(CN4)
circuit board (CNCT))
TAB connecter
on X52A
Connect to the
RS resistor
TB-P2
Connect to the smoothing
capacitor CB1
OCH439M
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
L1 - P1 , L2 - P1 , L3 - P1 , L1 - N1 , L2 - N1 , L3 - N1
2.Check of IGBT circuit
P2 - U , P2 - V , P2 - W , N2 - U , N2 - V , N2 - W
Note: The marks, L1 , L2 , L3 , N1 , N2 , P1 , P2 , U , V and W
shown in the diagram are not actually printed on the board.
CN7
Connect to the
outdoor converter
circuit board
(CN7)
P1
P2
+
81
CN2
Connect to the outdoor controller circuit
board (CN2)
1–5: Power circuit board
signal to the controller board (0–5 V DC)
2–5: Zero cross signal (0–5 V DC)
3–4: Not used
6–5: 16 V DC
7–5: 16 V DC
W
V
U
L3
L2
L1
N1 N2
TB-C1
Connect to the
smoothing capacitor
– +
CB1 , CB2
Transmitting
[ ]
1, 2, 6, 7: +
5: –
TB-U, TB-V,
TB-W
Connect to the
compressor (MC)
Voltage among
phases:
10–400 V AC
TB-L1, TB-L2, TB-L3
Connect to the
outdoor converter
circuit board
(L1-OU, L2-OU,
L3-OU)
400 V AC
TB-N1
Connect to the
smoothing capacitor
–
CB2 and the CK
capacitor
POWER
MODULE