Detection Of Low Voltage (Lvp) - Daikin FTXD60JV1B User Manual

SiBE04-101.book Page 115 Monday, October 15, 2001 3:08 PM
SiBE04-101

4.24 Detection of Low Voltage (LVP)

U2
Remote Controller
Display
Outdoor unit LED 5
A
Display
Method of
Abnormal voltage decrease in the DC section.
Malfunction
Detection
Malfunction When an low voltage signal is sent from the low voltage detection circuit to the microcomputer.
Decision
Conditions
Supposed Causes
Troubleshooting
Service Diagnosis
4 3 3
1 2 3
The system shuts down after low voltage is detected 255 times.
The malfunction counter is reset when there is no operation shutdown due to an malfunction (including
operation halt due to other cause) for 60 minutes (cumulative time) of compressor operation after the
malfunction condition is canceled.
Abnormal power supply voltage
Malfunction of low voltage detection section
Malfunction of PAM control parts or SSR
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check the power supply voltage.
Is the power NO
supply voltage within the
specification?
YES
Does the unit restart YES
when the power switch is
turned back on?
NO
Repeat 2 or 3
times.
Turn off the power switch.
Check the capacity of the main
circuit capacitor.
After making sure that there is
no DC voltage, measure
capacitor voltage.
Turn the power
YES
switch on. Does the capacitor
voltage increase (or
decrease) gradually?
NO
4
4
Correct the power supply.
External factors
l
Noise
l
Voltage distortion
Replace the outdoor unit PCB.
Replace the outdoor unit PCB.
Replace the capacitor.
Troubleshooting
(R1069)
115