Mitsubishi Electric Mr. SLIM MSZ-FA25VA Technical Manual página 818

Resolución de averías
Outdoor power circuit board
PUHZ-P100VHA.UK
PUHZ-P125VHA.UK
PUHZ-P140VHA.UK
CN2
Connect to the outdoor controller circuit board
(CN2)
1 -5 :Transmitting signal to the outdoor
controller circuit board (0~5V DC)
2 -5 :Zero cross signal (0~5V DC)
3 ,4 :18V DC
6 -5 :16V DC
7 -5 :16V DC
CN3
Thermistor (TH8)
<Heat sink>
CN5
Detection of primary
current
Connect to the
outdoor noise filter
circuit board (CN5)
CN4
Connect to the
outdoor controller
circuit board
(CN4)
TABP2/SC-P2
Connect to ACTM
TABN
Connect to the
smoothing capacitor
CB –
818
CNAF
Connect to ACTM
TABU/V/W
TABP
Connect to the compressor (MC)
Connect to the
Voltage among phases:10V~180V AC
smoothing capaci-
tor CB +
Brief Check of POWER MODULE
WUsually, 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 bridge (DS2, DS3)
TABP1-TABS, TABN1-TABS, TABP1-TABT,TABN1-TABT
2. Check of DIP-IPM
P-U, P-V, P-W, N-U, N-V, N-W
CNDC
280-380V DC (1 +, 3 –)
Connect to the outdoor
DIP-IPM
controller circuit board
TABS/TABT
Connect to
the outdoor
noise filter
circuit board
Voltage
among
phases:
220-240V AC
TABP1
Connect to
52C
TABN1
Connect to
ACTM
TABN2
Connect to ACTM