Mitsubishi Electric PQRY-P200YEM-A Service Handbook page 98

(2) Treatment of Inverter Output Related Troubles
Check item
[1] Perform the following:
1Disconnect INV board
Check the
INV board CNDR2. After removing, turn
error on the outdoor unit and check
detection the error status. (The
circuit. compressor does not operate
because CNDR2, which
carries the IPM drive signal,
has been disconnected.)
[2] Disconnect the compressor wir-
Check for ing, and check the compressor
compressor Meg, and coil resistance.
ground fault
or coil error.
[3] Perform the following:
1Reconnect the connector re-
Check to see
if the inverter moved at item [1].
2Disconnect the compressor
is damaged.
Perform this wiring.
3Turn on SW1-1 on the INV
check if an
error occurs board. Operate the outdoor
immediately unit after above steps. Check
before or the inverter output voltage.
after turning It is recommend to use the
on the com- tester used to determine the
pressor. [1] (5) 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 Check the inverter output volt-
if the inverter age.
is damaged. It is recommend to use the
Perform this tester used to determine the
check if an [1] (5) 5) IPM troubleshooting
error occurs when checking the inverter
during output voltage.
steady op- Measure when the inverter out-
eration. put frequency is stable.
Phenomena
1 IPM/overcurrent error. (4250)
2 ACCT sensor circuit error.
(5301 detailed No. 6)
3 ACCT sensor circuit error.
(5301 detailed No. 13)
1 Compressor Meg failure
Error if less than 1MΩ.
When no refrigerant is
accumulated in the compressor.
2 Compressor coil resistance failure
Coil resistance value of 0.48Ω
(20°C)
1 IPM/overcurrent error.
(4250)
2 There is a high possibility of an
inverter circuit error if the voltage
unbalance across all wiring is
greater than the larger of the
values represented by 5% or 5V.
3 No voltage unbalance across all
¶
wiring
1 There is a high possibility of an
inverter circuit error if the voltage
unbalance across all wiring is
greater than the larger of the
values represented by 5% or 5V.
¶
2 No voltage unbalance across all
wiring
–97–
Treatment
• Replace INV board.
¶
See to [1] (5) 4)
"Current Sensor ACCT"
Check the resistance and replace if
erroneous. Replace the INV board if the
ACCT status is normal.
• INV board error detection circuit is normal.
Because IPM can not drive, if the CNDR2
is disconnected.
• Replace compressor
Check whether the refrigerant is accumu-
lating 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 compressor 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 compressor if
there is no problem at [5].