Mitsubishi Electric EHST20C-VM6HB Service Manual page 58

Split-type, air to water heat pump
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Outdoor power circuit board
PUHZ-SW100YHAR1.UK
PUHZ-SW100YHAR3.UK
PUHZ-SW100YHAR4.UK
PUHZ-SW120YHAR1.UK
PUHZ-SW120YHAR3.UK
PUHZ-SW120YHAR4.UK
PUHZ-SW100YHAR1-BS.UK
PUHZ-SW100YHAR3-BS.UK
PUHZ-SW100YHAR4-BS.UK
PUHZ-SW120YHAR1-BS.UK
PUHZ-SW120YHAR3-BS.UK
PUHZ-SW120YHAR4-BS.UK
Diode module
TAB connector
on X52CA
Connect to the
RS resistor
TB-L1,
TB-L2,
TB-L3
Connect to the
outdoor converter
circuit board
(L1-OU, L2-OU,
L3-OU)
400 V AC
CN4
Connect to the
outdoor controller
circuit board (CN4)
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
[ 5 : −
1, 2, 6, 7 : + ]
OCH533D
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 DIODE MODULE
L1 - P1 , L2 - P1 , L3 - P1 , L1 - N1 , L2 - N1 , L3 - N1
2. Check of DIP-IPM
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
TB-N
Connect to the CK capacitor
P1
L1
L2
CN5
Detection of primary
current (Connect to
the outdoor noise filter
circuit board (CNCT))
Transmitting
shown in the diagram are not actually printed on the board.
TB-U, TB-V, TB-W
Connect to the compressor (MC)
Voltage among phases:
10–400 V AC
N2
L3
N1
CN7
L3OUT-L3IN
Connect to the
Lead connect
outdoor converter
circuit board (CN7)
CN6
Thermistor
<Heat sink> (TH8)
58
W
V
U
P2
DIP-IPM

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