Mitsubishi Electric EHST20C-VM6HB Service Manual page 57

Outdoor power circuit board
PUHZ-SW100YHA.UK
PUHZ-SW120YHA.UK
PUHZ-SW100YHA-BS.UK
PUHZ-SW120YHA-BS.UK
Diode module
TAB connector
on X52CA
Connect to the
RS resistor
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: 16V DC
[ 5 : − 1, 2, 6, 7 : + ]
OCH533D
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
→
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
shown in the diagram are not actually printed on the board.
N2
L3 N1
CN7
Connect to the
outdoor converter
circuit board (CN7)
CN6
Thermistor
<Heat sink> (TH8)
57
TB-U, TB-V, TB-W
Connect to the compressor (MC)
Voltage among phases:
10–400 V AC
W V U P2
TB-L1, TB-L2, TB-L3
Connect to the outdoor
converter circuit board
(L1-OU, L2-OU, L3-OU)
400 V AC
DIP-IPM