Daikin RXYQ96PYDN Service Manual page 487

Troubleshooting (OP: Unified ON/OFF Controller)
[Check 15] Concept of inverter-related malfunction codes
Power supply
(3 phase, 460VAC)
(3 phase, 230VAC)
U2 P1
Imbalanced power supply voltage
When imbalance in
voltages among three
phases comes to 2%
or more
Power supply voltage error
When the power supply
voltage falls out of the
range of 460VAC±10%
230VAC±10%
Malfunction codes related
to compressor current
472
Main (Control) PC board
LC
Weak-current
part
Heavy-current
part (Power
transmission etc.)
L1 P4
Faulty fin thermistor
When the fin thermistor resistor detects
an open circuit (-22˚F or less) or a short
circuit (248˚F or more)
Faulty inverter
When the heavy current part of
inverter gets faulty (gives no output)
Instantaneous
overcurrent
460V: 32.3A
(230V: 59.1A)
460V: 19.0A
(230V: 33.5A)
5 consecutive sec.
460V: 16.1A
(230V: 27.6A)
Inverter
PC board
L5 L8
L4 PJ
PC board mismatching
When incorrect inverter
PC board is connected
Radiator fin temperature rise
When the radiator fin
temperature reached
199.4˚F or more
L5
Compressor overcurrent
(Electronic thermal 2)
260 consecutive sec.
SiUS34-801A_b
Transmission error
When transmissions between the
main PC board and the inverter
PC board are not normal
Instantaneous overcurrent of inverter compressor
(When inverter output current exceeds 460V units:
32.3A 230V units: 59.1A even instantaneously)
Overcurrent of inverter compressor
For 460V units
An overcurrent of 19.0A or more continues
for a period of 5 consecutive seconds
An overcurrent of 16.1A or more continues
for a period of 260 consecutive seconds.
For 230V units
A current of 33.5A or more continues for a
period of consecutive 5 sec.
A current of 27.6A or more continues for a
period of consecutive 260 sec.
E5 L9
Faulty startup of inverter compressor
(Compressor stops running
immediately after it starts up.)
Inverter compressor lock
(Compressor does not run at all.)
L8
Compressor overcurrent
(Electronic thermal 1)
Max. control
Time
Troubleshooting
L8