Low-Voltage Detection Or Over-Voltage Detection - Daikin D-Series Service Manual

Si12-619A
5.27 Low-voltage Detection
U2
Remote
Controller
Display
Outdoor Unit LED A
Display
Method of An abnormal voltage rise or drop is detected by checking the detection circuit or DC voltage
detection circuit.
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
Troubleshooting
Service Diagnosis
1 2 3 4
5 4 1 1
An over-voltage signal is fed from the over-voltage detection circuit to the microcomputer, or
the voltage being detected by the DC voltage detection circuit is judged to be below 150 V
for 0.1 second.
The system will be shut down if the error occurs 16 times.
Clearing condition: Continuous run for about 60 minutes (normal)
Supply voltage not as specified
Over-voltage detector or DC voltage detection circuit defective
PAM control part(s) defective
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Check the supply voltage.
Supply voltage as
specified?
YES
Turn on the
power again.
System restarted?
NO
Repeat a
couple of times.
or Over-voltage Detection
4
NO
(Precaution before turning on the power again)
Make sure the power has been off for
at least 30 seconds.
YES
Disturbance factors
∗ Noise ∗ Power supply distortion
Troubleshooting
Correct the power supply.
Check for such factors for a
long term.
∗ Try to get restarted a
couple of times.
Replace the SPM or PM1.
(Replace the outdoor unit
PCB.)
(R2854)
257