Mitsubishi Electric PUMY-P125VMA1 Technical & Service Manual page 44

Display
Meaning and detecting method
4220
PUMY-P125YMA
PUMY-P125YMA
1
Shortage abnormality of inverter bus-bar
voltage
1 When direct current bus-bar voltage
reduces extremely during the compressor
operation, the compressor stops and
restarts operation in 3minutes.
2
It is being delay to stop abnormally for 30
minutes after the compressor stop. Then,
when SW1 is set, the outdoor unit address
No. and check code <4320> blinks
alternately on the 4 digit digital display.
SW1 setting
1 3 4 5 6 7 8 2
on
3
When detecting abnormality of direct bus-
bar voltage decrease again during being
delay abnormality, it performs the same
action as 1. Also, when the abnormality is
not detected, it operates normally.
Hereafter, action 1 is repeated until 5th
abnormal detection.
4
When the 6th voltage decrease of direct
bus bar is detected during being delay
abnormality, it stops abnormally. In this
time, the outdoor unit address No. and
check code <4220> blinks alternately on
the 4 digit digital display.
4230 Radiator panel shield temperature
1
When the radiator panel temperature
thermistor (THHS(A/B)) detects abnormality
(1w detection) stops the outdoor unit once
and restarts operation in 3minutes.
2
It is being delay to stop abnormally for
30minutes after the compressor stop.
(PUMY-P125VMA PUMY-P125VMA
10 minutes) Then, when SW1 is set,
outdoor unit address No. and check delay
code <4330> blinks alternately on the 4
digit digital display.
on
SW1 setting
3 When the radiation shield temperature
thermistor (THHS(A/B)) detects abnormality
again (2nd detection) during delay
abnormality, perform the same action as 1.
4
When the radiation shield temperature
thermistor (THHS(A/B)) detects abnormality
on 3rd time during delay abnormality, it
stops abnormally. (PUMY-P125VMA
PUMY-P125VMA
1
outdoor unit address No. check code
<4230> blinks alternately on the 4 digit
digital display.
Abnormality detecting temperature in
radiation shield temperature thermistor
Type Abnormal temperature (;)
125VMA/VMA
1
125YMA/YMA
1
1) Power supply terminal voltage is low.
2) Power supply L2,L3-phase is
opened.
3) Diode stack (Diode module)
defective.
4) Connector lead wire disconnection,
contact failure.
Power supply board connecting
connector (CND)-Between smoothing
capacitor (CB1 and CB2).
Power supply board connecting
connector (52C)-Between electron-
magnetic contactor (52C)
5) Connector (CN2) disconnection,
contact failure.
6) Instant power failure
7) Lightening serge, single interruption
by external noise.
8) Direct bus-bar voltage shortage
detecting circuit failure in power supply
board
1) Outdoor fan motor lock
2) Outdoor fan motor trouble
3) Block of duct which cooled air
passes
:
1
4) Surrounding temperature-rise
1 3 4 5 6 7 8 2
5) Thermistor failure
6) Thermistor input circuit failure in the
multi controller board
: 5 minutes) Then, the
85
84
Causes
1
2
44
Check points
Measure the terminal voltage, and
check whether the voltage decreases
or not.
Check the power supply is opened.
Check the resistance of diode stack.
Check the defective points.
Check the connector insertion.
It happens by accident, and does not
have the possibility to happen again.
It happens by accident, and does not
have the possibility to happen again.
Replace the power supply board.
Check the outdoor fan motor.
Check the outdoor fan motor.
Check whether the air duct for cooling
is opened.
Check whether there is a heat source
in surroundings of the outdoor unit.
(Surroundings temperature upper limit
is 46;)
Check the resistance of thermistor.
(Use tester)
1 3 4 5 6 7 8 2
on
Change the SW1 to
check the temperature in radiation
shield temperature thermistor.
When there is a big difference between
the detected temp. and thermistor
temp. replace the multi controller
board.
and