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Mitsubishi Electric PURY-P200 Service Handbook page 186

City multi r410a
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(3) Trouble measures when main power breaker tripped
Check item
[1]
Perform Meg check between the
terminals in the power terminal
block TB1.
[2]
Turn on the power again and
check once more.
Turn on the outdoor unit and check
[3]
that it operates normally.
(4) Simple checking procedure for individual components of main inverter circui
✻
Before checking, cut the power off and remove the required parts from the control box.
Part name
Diode stack
IPM
(Intelligent power module)
Rush current protection resistor
R11, R12
Electromagnetic contactor
(52C1, 52C2, 52F)
DC reactor DCL
Current sensor
ACCT
Phenomena
(1) Zero to several ohm, or Meg failure.
(1) Main power breaker trip
(2) No remote control display
(1) Operates normally without tripping the
main breaker.
(2) Main power breaker trip
Refer to "Determining diode stack troubleshooting" ( 9.[4].7.(6) )
Refer to "Determining IPM interference" ( 9.[4].7.(5) )
Measure the resistance between terminals: 47Ω ± 10%
[In the case of 52C1, 52C2]
A1
A2
13
L1
L2
L3
Pushbutton
14
T1
T2
T3
[In the case of 52F]
A1
A2
L1
L2
L3
13
Pushbutton
T1
T2
T3
14
Measure the resistance between terminals: 1Ω or lower (almost 0Ω)
Measure the resistance between terminals and the chassis : ∞
Disconnect the CNCT2 target connector
and check the resistance between
terminals: 280Ω ± 30Ω
1-2PIN (U-phase)
3-4PIN (W-phase)
- 183 -
Check each part in the main inverter circuit.
• Refer to "Simple checking Procedure for in-
dividual components of main inverter circuit".
a. Diode Stack
b. IPM
c. Rush current protection resistor
d. Electromagnetic relay
e. DC reactor
f. Noise filter
a. There is a possibility that the wiring shorted
momentarily.
Trace the short and repair.
b. If a. above is not the case, there is a possi-
bility that there was a compressor failure.
• A compressor ground fault can be consid-
ered. Go to (2) - [2].
t
Judgement method
Checking position
A1-A2
31
Button
L1-T1
ON
L2-T2
(pushdown)
L3-T3
13-14
32
31-32
Button
L1-T1
OFF
L2-T2
L3-T3
13-14
31-32
ACCT-U
U
❉ Check the ACCT connecting phase and direction.
Treatment
Judgement value
0.1k~2.0kΩ
1Ω
or less (Almost 0Ω)
∞
∞
1Ω
or less (Almost 0Ω)
U
W
ACCT-W
V
W
IPM
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