Mitsubishi Electric PURY-EP200 Service Handbook page 291

[ IX Troubleshooting ]
[3] (1)
Check wheth-
er the inverter
is damaged.
(No load)
(2)
(3)
[4] Put the outdoor unit into opera-
Check wheth- tion.
er the inverter Check the inverter output volt-
is damaged. age after the inverter output fre-
(During com- quency has stabilized.
pressor opera-
tion)
[5] Remove the wire for the out-
Check the fan door fan motor, and check the
motor ground fan motor megger and the
fault or the winding resistance.
winding.
HWE0713A
Items to be checked
Disconnect the inverter
output wire from the termi-
nals of the inverter board
(SC-U, SC-V, SC-W).
Disconnect the short-cir-
cuit connector from CN6
on the inverter board.
Put the outdoor unit into
operation.
Check the inverter output
voltage after the inverter
output frequency has sta-
bilized.
Phenomena
1) Inverter-related problems are de-
tected.
2) Inverter voltage is not output at the
terminals (SC-U, SC-V, and SC-W)
3) There is an voltage imbalance be-
tween the wires.
Greater than 5% imbalance or 5V
4) There is no voltage imbalance be-
tween the wires.
1) Overcurrent-related problems occur
immediately after compressor start-
up.
Error code: 4250
Detail code: 101, 106, 107
2) There is an voltage imbalance be-
tween the wires.
Greater than 5% imbalance or 5V
1) Fan motor megger failure
Failure when the megger is 1Mohm
or less.
2) Fan motor disconnection
Standard: The winding resistance is
approximately several ohm.
(It varies depending on the temper-
ature, or while the inner thermo is
operating, it will be ohm)
- 282 -
Remedy
Connect the short-circuit
connector to CN6, and go to
section [1].
Replace the INV board.
Replace the INV board.
Normal
*Reconnect the short-circuit
connector to CN6 after
checking the voltage.
a. Check items [1] through
[3] for problems.
b. Check that high and low
pressures are bal-
anced.
c. Check that no liquid re-
frigerant is present in
the compressor.
Go to "d." when the
problem persists after
compressor startup was
repeated several times.
If normal operation is
restored, check the
crankcase heater for
problems.
d. Check that there is a
pressure difference be-
tween high and low
pressures after com-
pressor startup.
Check the high pres-
sure with LED monitor
for changes.
Replace the compres-
sor if there is no pres-
sure difference. (the
compressor may be
locked.)
Replace the INV board if
there is a voltage imbalance.
Check the crankcase heater
for problems if there is no
voltage imbalance.
When the error occurred, liq-
uid refrigerant may have
been present in the com-
pressor.
Replace the fan motor.
GB