Daikin VRVIII-S, Service Manual

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SiENBE34-703 Troubleshooting by Indication on the remote control
Troubleshooting 143
3.17 “
E5
” Inverter Compressor Motor Lock
remote control
Display
E5
Applicable
Models RXYSQ4~6P
Method of
Malfunction
Detection Inverter PC board takes the position signal from UVW line connected between the inverter and
compressor, and the malfunction is detected when any abnormality is observed in the phase-
current waveform.
Malfunction
Decision
Conditions This malfunction will be output when the inverter compressor motor does not start up even in
forced startup mode.
Supposed
Causes ! Compressor lock
! High differential pressure (0.5MPa or more)
!
Incorrect UVW wiring
! Faulty inverter PC board
! Stop valve is left in closed.
Troubleshooting
Check the installation
conditions.
Is the stop valve open?
Is the UVW wiring normal?
Is high differential
pressure starting?
(0.5MPa or more)
Check and see
whether compressor
is short-circuited or
ground.
Are inverter output
voltages the same for
3 phases?
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Does low or high
pressure vary even
instantaneously
when restarting
compressor?
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Open the stop valve.
Connect correctly.
Remedy the cause.
Replace the compressor.
Replace the inverter PC
board Assy (A2P).
Replace the compressor.
(V2793)
NO