Daikin VRV III REYQ8PY1, Service Manual

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Troubleshooting (OP: Unified ON/OFF Controller) Si37-701
360 Troubleshooting
[Check 15] Concept of inverter-related malfunction codes
32.3A
19.0A
16.1A
260 consecutive sec.
5 consecutive sec.
P4 L1 L4 U2 P1 PJ E5 L9
L5 L8
LC
Inverter compressor lock
(Compressor does not run at all.)
PC board mismatching
When incorrect inverter
PC board is connected
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 400VAC±10%
Radiator fin temperature rise
When the radiator fin
temperature reached
93˚C or more
Faulty fin thermistor
When the fin thermistor resistor detects
an open circuit (-30˚C or less) or a short
circuit (120˚C or more)
Transmission error
Overcurrent of inverter compressor
When transmissions between the
main PC board and the inverter
PC board are not normal
Main (Control) PC board
Weak-current
part
Heavy-current
part (Power
transmission etc.)
Inverter
PC board
Compressor
Power supply
(3 phase, 400VAC)
Current
Time
L5
L8
L8
Instantaneous
overcurrent
Compressor overcurrent
(Electronic thermal 2)
Compressor overcurrent
(Electronic thermal 1)
Max. control
When the heavy current part of
inverter gets faulty (gives no output)
Instantaneous overcurrent of inverter compressor
(When inverter output current exceeds 32.3A
even instantaneously)
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.
Faulty startup of inverter compressor
(Compressor stops running
immediately after it starts up.)
Malfunction codes related
to compressor current
Faulty inverter