Inverter Compressor Motor Lock; E5" Inverter Compressor Motor Lock - Panasonic U-4..6ML5XPQ Service Manual

Troubleshooting by Indication on the Remote Controller
E5
3.21 " "

Inverter Compressor Motor Lock

E5
Remote
Controller
Display
Applicable U-4..6ML5DPQ, U-4..6ML5XPQ
Models
Method of 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-
Malfunction
current waveform.
Detection
Malfunction This malfunction will be output when the inverter compressor motor does not start up even in
forced startup mode.
Decision
Conditions
Supposed
Causes
Troubleshooting
168
Compressor lock
High differential pressure (0.5MPa or more)
Incorrect UVW wiring
Faulty inverter PC board
Stop valve is left in closed.
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
Urban Multi ML5 · Mini UM · Heat Pump
Open the stop valve.
Connect correctly.
Remedy the cause.
Replace the compressor.
Replace the inverter PC
board Assy (A2P).
Replace the compressor.
(V2793)
Troubleshooting