Mitsubishi Electric PUHY-P200 Service Handbook page 145

(2) Treatment of inverter output related troubles
[1] Perform the following:
Check the INV 1. Disconnect INV board CNDR2.
board error After removing, turn on the out-
detection circuit. door unit and check the error
status. (The compressor does
not operate because CNDR2,
which carries the IPM drive sig-
nal, has been disconnected.)
[2] Disconnect the compressor wir-
Check for com- ing, and check the compressor
pressor ground Meg, and coil resistance.
fault or coil error.
[3] Perform the following:
Check to see if 1. Reconnect the connector re-
the inverter is moved at item [1].
damaged. 2. Disconnect the compressor wir-
• Perform this ing.
check if an er- 3. Turn on SW1-1 on the INV
ror occurs im- board. Operate the outdoor unit
mediately be- after above steps. Check the in-
fore or after verter output voltage.
turning on the • It is recommend to use the teste
rused to determine the
compressor.
9.[4].6.(5) IPM troubleshooting
when checking the inverter
output voltage.
• Measure when the inverter out-
put frequency is stable.
[4] Turn on the outdoor unit.
Check to see if Check the inverter output voltage.
the inverter is • It is recommend to use the teste
rused to determine the
damaged.
9.[4].6.(5) IPM troubleshooting
• Perform this
when checking the inverter
check if an er-
output voltage.
ror occurs dur-
ing steady op- • Measure when the inverter out-
eration. put frequency is stable.
Check item
(1) IPM/overcurrent error.
(4250 detailed No. 101, 102, 103,
104, 105, 106, 107)
(2) Logic error
(4250 detail No.111)
(3) ACCT sensor circuit error.
(5301 detailed No. 115)
(4) DCCT sensor circuit error.
(5301 detailed No. 116)
(5) IPM open error
(5301 detail No.119)
(1) Compressor Meg failure
Error if less than 1MΩ.
• When no refrigerant is accumu-
lated in the compressor.
(2) Compressor coil resistance failure
Coil resistance value of 0.16Ω
(20˚C)
(1) IPM/overcurrent error.
(4250 detailed No. 101, 102, 103,
104, 105, 106, 107)
(2) There is a high possibility of an in-
verter circuit error if the voltage un-
balance across all wiring is greater
than the larger of the values repre-
sented by 5% or 5V.
(3) No voltage unbalance across all wir-
ing
(1) There is a high possibility of an in-
verter circuit error if the voltage un-
balance across all wiring is greater
than the larger of the values repre-
sented by 5% or 5V.
(2) No voltage unbalance across all wir-
ing
Phenomena
- 143 -
Treatment
• Replace the INV board.
• Replace the INV board.
See to 9.[4].6.(4)
"Current Sensor ACCT"
Check the resistance and replace if er-
roneous. Replace the INV board if the
ACCT status is normal.
• Replace the DCCT
After replacing the DCCT, operate the
outdoor unit again. In the case when
the error occurs again, replace the INV
board. (The DCCT may be no prob-
lem.)
• Normal
• Replace compressor
Check whether the refrigerant is ac-
cumulating in the compressor again.
• Refer to item [5] for inverter circuit
trouble.
See item [2].
Proceed to item [5] however if there is
no problem at [2]. Replace the com-
pressor if there is no problem at [5].
• Refer to item [5] for inverter circuit
trouble.
See item [2].
Proceed to item [5] however if there is
no problem at [2]. Replace the com-
pressor if there is no problem at [5].