Compressor Motor Lock; E5" Compressor Motor Lock - Daikin RXYQ5-48MAY1 Service Manual

Troubleshooting by Indication on the Remote Controller
3.16 " E5 "

Compressor Motor Lock

E5
Remote
Controller
Display
Applicable RXYQ5MA~48MA
Models
Method of Inverter PC board takes the position signal from UVWN line connected between the inverter and
compressor, and detects the position signal pattern.
Malfunction
Detection
Malfunction The position signal with 3 times cycle as imposed frequency is detected when compressor
motor operates normally, but 2 times cycle when compressor motor locks. When the position
Decision
signal in 2 times cycle is detected.
Conditions
Supposed
Causes
Troubleshooting
200
Compressor lock
High differential pressure (0.5MPa or more)
Incorrect UVWN 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 UVWN 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
Si39-407
Open the stop valve.
Connect correctly.
Remedy the cause.
Replace the compressor.
Replace the inverter PC
board (A2P).
Replace the compressor.
(V2793)
Troubleshooting