Compressor Motor Lock - Daikin E-Series Service Manual

Troubleshooting for Outdoor Unit
7.4

Compressor Motor Lock

E5
Remote Control
Display
Applicable
AII outdoor unit models
Models
Method of Inverter PCB takes the position signal from UVW line connected between the inverter and
Malfunction compressor, and the malfunction is detected when any abnormality is observed in the phase-
current waveform.
Detection
Malfunction
This malfunction will be output when the inverter compressor motor does not start up even in
Decision forced startup mode.
Conditions
" Compressor lock
Supposed
" High differential pressure (0.5MPa or more)
Causes
" Incorrect UVW wiring
" Faulty inverter PCB
" Stop valve is left in closed.
Troubleshooting
312
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check the installation
conditions.
Is the stop valve open?
YES
Is the UVW wiring
normal?
YES
Is high
differential pressure starting?
(0.5MPa or more)
NO
Check and see
whether compressor is
short-circuited or
ground.
NO
Are inverter
output voltages the same
for 3 phases?
YES
Does low or
high pressure vary
even instantaneously when
restarting
compressor?
NO
NO
NO
YES
YES
NO
YES
SiENBE18-621
Open the stop valve.
Connect correctly.
Remedy the cause.
Replace the compressor.
Replace the inverter PC
board (A1P).
Replace the compressor.
(V2793)
Troubleshooting