Power Supply Insufficient Or Instantaneous Abnormality - Daikin VRV EMERION REYQ-AATJA Service Manual

SiUS372201EB

3.66 Power Supply Insufficient or Instantaneous Abnormality

Applicable
All outdoor unit models
Models
U2
Error Code
Method of Error
Detect the voltage of capacitor of the main circuit in the inverter PCB.
Detection
Error Decision
When the voltage in the DC circuit (between diode module and power module) falls below 190 VDC
Conditions (for 208/230 V models) or 380 VDC (for 460 V models).
Supposed
 Abnormal power supply voltage
Causes  Instantaneous power failure
 Open phase
 Defective inverter PCB
 Defective outdoor unit main PCB
 Defective compressor
 Defective main circuit wiring
 Defective fan motor
 Defective connection of signal cable
Troubleshooting
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check for power supply
conditions.
(1) Power supply voltage falls
within ±10% of the rated
voltage?
(2) Any open phase in the
power supply wiring or any
wrong wiring?
(3) Imbalance in the power
supply voltage is
maintained within 12 V?
There are
some defects in the
power supply conditions
aforementioned.
NO
The insulation
resistance of the
compressor is less than
100 k:.
NO
A
Go to the next page.
YES
YES
Troubleshooting by Error Code
Fix the defects.
Replace the compressor.
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