Daikin J Series Service Manual Page 250

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SiE18-201 Troubleshooting - Outdoor Unit Related
Service Diagnosis 239
3.3.27 Overvoltage, Low Voltage
Outdoor Unit
Indication
U2
Method of
Malfunction
Detection
Power supply system error is detected using the voltage of inverter DC unit.
Malfunction
Decision
Conditions
When, after starting the compressor, the voltage reached to below 210V over 450V before it
exceeded 320V, or to below 260V or over 450V after it exceeded 320V once.
When a power supply system error is generated 4 times, the system shuts down.
(The 4-time counter resets itself when no outdoor unit abnormality occurs within 60-minute
cumulative time after the error generation.)
Supposed
Causes
Electrolytic capacitor malfunction
PAM module malfunction
Faulty power transistor
Disconnection · Faulty connection of internal wiring
Faulty reactor
Faulty PC board
Instantaneous power failure
Mismatching with power supply of feedback control system
Troubleshooting
Check No.5
Refer to P.251
Check No.11
Refer to P.256
Check No.12
Refer to P.257
YES
Could be causes on site.
Replace if any abnormality.
Replace control PC board,
filter PC board if the voltage
is not within the range.
Replace active module.
As the system will not shut
down, use as it is.
Is the input
voltage within a range of
220-240V±10%?
(MF046)
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check No. 12
Electrolytic capacitor
capacity check
OK
Check No. 13
Voltage check when starting
the compressor
Check No. 5
Main circuit wiring
connection check
Measure the voltage at both
ends of electrolytic capacitor
while the compressor is
operating.
YES
Does the
voltage reach to
approximately 370V within
approximately 2 seconds
after starting the
compressor?
NO
Do a long-term observation
on power supply voltage.
Supposed causes
Instantaneous power failure
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