Daikin RMXS-L Series, Руководство по обслуживанию

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Troubleshooting for Outdoor Unit SiUS181305E
211 Troubleshooting
7.25 Power Supply Insufficient or Instantaneous Failure
Error Code
U2
Method of Error
Detection
Detection of voltage of main circuit capacitor built in the inverter and power supply voltage.
Error Decision
Conditions
When the abnormal voltage of main circuit capacitor built in the inverter and abnormal power supply
voltage are detected
Supposed
Causes

Power supply insufficient

Instantaneous power failure

Defective outdoor fan motor

Defective main PCB (A1P)
Troubleshooting
Check No.32
Refer to P.222
Is the power
supply voltage
200~240V ±10%?
Is the P-N
resistance not less
than several hundred
of ohms?
Check
No.32
Is the resistance
between each pin of the fan
motor above
standard
value?
Is the
measured voltage 220 -
240 VDC or
more?
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Correct the power supply.
Field factors
Replace the main PCB
(A1P).
(R19139)
YES
YES
YES
NO
NO
Replace the fan motor.
NO
Monitor the voltage
(Instantaneous voltage
drop)
YES
NO
When the compressor is
running, measure the voltage
b and - of
electrolytic capacitor (C+, C-).