E5" Compressor Motor Lock - Daikin R-410A Service Manual

SiBE39-402A

4.17 "E5" Compressor Motor Lock

E5
Remote
Controller
Display
Applicable
AII outdoor unit models
Models
Method of Inverter PC board takes the position signal from UVWN line connected between the inverter and
Malfunction compressor, and detects the position signal pattern.
Detection
Malfunction
The position signal with 3 times cycle as imposed frequency is detected when compressor
Decision motor operates normally, but 2 times cycle when compressor motor locks. When the position
signal in 2 times cycle is detected.
Conditions
! Compressor lock
Supposed
! High differential pressure (0.5MPa or more)
Causes
! Incorrect UVWN wiring
! Faulty inverter PC board
! Stop valve is left in closed.
Troubleshooting
Troubleshooting
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
Troubleshooting by Indication on the Remote Controller
NO
NO
YES
YES
NO
YES
Open the stop valve.
Connect correctly.
Remedy the cause.
Replace the compressor.
Replace the inverter PC
board (A2P).
Replace the compressor.
(V2793)
129