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Checking The Inverter For Damage During Compressor Operation; Checking The Fan Motor For Ground Fault And Coil Resistance Problems; Checking The Fan Board Error Detection Circuit At No Load - Mitsubishi Electric PURY-HP72 Service Handbook

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[8-10 Troubleshooting Inverter Problems (TKMU) ]
8-10-5

Checking the Inverter for Damage during Compressor Operation

Items to be checked
Put the outdoor unit into operation.
Check the inverter output voltage
after the inverter output frequency
has stabilized.
8-10-6

Checking the Fan Motor for Ground Fault and Coil Resistance Problems

Items to be checked
Remove fan motor winding. Check
insulation resistance and coil resis-
tance.
8-10-7

Checking the Fan Board Error Detection Circuit at No Load

Items to be checked
(1)
Turn off breaker.
*Turn power off without fail.
(2)
Remove Fan board CNINV
and CNSNR connectors.
(3)
Turn on breaker.
(4)
Operate unit.
HWE13080
Phenomena
1)
Overcurrent-related prob-
lems occur immediately af-
ter compressor startup.
(4250 Details : No.101, 102,
103, 106, 107)
2)
There is a voltage imbal-
ance between the wires af-
ter the inverter output
voltage is stabilized.
Greater than the larger of
the following values: imbal-
ance of 5% or 5V
Phenomena
1)
Fan motor insulation failure.
If < 1 MΩ, Defect.
2)
Fan motor wire failure.
Normal coil resistance is a few ohms.
(Changes with temperature)
Phenomena
1)
Electrical current over load error.
Check code: 4255
Detail code: 101, 104
2)
Logic error
Check code: 4255
Detail code:111
3)
Position error on start up
Check code: 5305
Detail code: 132
- 291 -
Remedy
a.
Check items 8-10-2 through 8-10-4 for prob-
lems.
b.
Check that high and low pressures are balanced.
c.
Check that no liquid refrigerant is present in the com-
pressor.
→Go to "d." when the problem persists after compres-
sor startup was repeated several times.
If normal operation is restored, check the belt heater
for problems.
d.
Check that there is a pressure difference between
high and low pressures after compressor startup.
→Check the high pressure with LED monitor for
changes.
Replace the compressor if there is no pressure differ-
ence. (the compressor may be locked.)
If there is a voltage imbalance, replace the IPM.
If the problem persists, replace the INV board.
If the problem persists after replacing the above
parts, go to section 8-10-3.
Check the belt heater for problems if there is no
voltage imbalance.
→When the error occurred, liquid refrigerant may
have been present in the compressor.
Remedy
Change fan motor.
Change fan motor.
Remedy
Change Fan board.
Change Fan board.
Normal
*After checking, return connector
CNINV & CNSNR.
GB

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