Mitsubishi Electric City Multi PURY-EM200YNW-A1, Service Handbook

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[8-10 Troubleshooting Inverter Problems ]
BS_08_L chapter 8 -
45
8 Troub
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8-10-6 Checking the Converter for Damage during Compressor Operation
<INV37YC> 3) An overcurrent error occurs during oper-
ation.
Error code : 4250
Detail code : 121,122
[8-10-6 Checking the Converter for
Damage during Compressor Oper-
ation]
4) An overcurrent error occurs immediately
after compressor startup.
Error code : 4250
Detail code :101,106,107,128
a. Check for refrigerant flooding.
→ When the problem persists after
compressor startup was repeated
several times, go to "d" after a cer-
tain time after energizing the com-
pressor or the heater.
If normal operation is restored,
check the belt heater for problems.
b. Check that there is a pressure dif-
ference between high and low
pressures after compressor start-
up.
→ Check the high pressure with
LED monitor for changes.
Replace the compressor if there is
no pressure difference. (the com-
pressor may be locked.)
c. Check for interphase voltage im-
balance.
d. Replace the INV board if no prob-
lems were found with the items a or
c.
e. If the problem persists after replac-
ing the inverter board, [8-10-3
Checking the Compressor for
Ground Fault and Coil Resistance
Problems]
5) An overvoltage error occurs during oper-
ation.
Error code : 4220
Detail code :109,110,112
[8-10-6 Checking the Converter for
Damage during Compressor Oper-
ation]
6) No problems were found with items 1)
through 5).
Normal [8-10-6 Checking the Con-
verter for Damage during Com-
pressor Operation]
Items to be checked Phenomena Remedy
Items to be checked Phenomena Remedy
(1) Operate the outdoor unit. 1) BUS voltage does not boost (does
not change) BUS voltage does not
boost to approximately between
650 and 750 VDC, or the following
errors are detected.
Error code : 4220
Detail code : 123
Replace the inverter board.
(2) Check the BUS voltage after the
converter circuit went into oper-
ation and the BUS voltage has
boost.
*The voltage generally boost at
or above 80 rps, depending on
the power source voltage.
2) An overcurrent error occurs after
converter circuit goes into opera-
tion.
Error code : 4250
Detail code : 121,122
a.If the problem persists after startup, re-
place the inverter board.
b.If the problem persists after replacing
the inverter board, replace the DCL.
3) An overvoltage error occurs after
converter circuit goes into opera-
tion.
Error code : 4220
Detail code : 109,110,112
a.If the problem persists after startup, re-
place the inverter board.
b.If the problem persists after replacing
the inverter board, replace the DCL.
4) No problems were found with items
1) through 3).
Normal
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