Method of Troubleshooting Si30-408
90 Troubleshooting
3.8 Diagnosis on Malfunction Code of Inverter System
3.8.1 Understanding of Malfunction Code
In case of 3 phase, 200~220V class model
When DC exceeds 70 A even instantaneously.
(Instantaneous / Overcurrent) AC, DC
(Instantaneous / Overcurrent) AC, DC
Compressor rocked.
Power transistor short-circuited.
Differential pressure
Liquid return
Oil shortage
(Stall prevention)
When exceeds for a
period of 5 seconds.
(30 Hz or less)
Overload
(Electronic thermal detector) (54 A detected in some cases)
Main causes
In normal operation
Control PC board Inverter PC board Power unit
Detect signal of power unit
with inverter PC board
Compressor
Signal
Transmission malfunction
Malfunction of transmission
between external control
PC board and inverter PC
board.
Safety device of inverter
system actuated in inverter
microcomputer
The radiation fin temperature is 90˚C or more during
compressor stop, and does not lower to 80˚C or less
within 30 minutes.
When the radiation fin
temperature is 90˚C or
more
(Fin thermal sensor actuated)
Radiation fin
temperature
Malfunction
code
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