Daikin VRV II RXYQ5MATL, Service Manual, Page: 199 / 331

Troubleshooting by Indication on the Remote Controller Si39-504
188 Troubleshooting
3.16
“
E5
”
Outdoor Unit: Compressor Motor Lock
Remote
Controller
Display
E5
Applicable
Models RXYQ5MA~48MA
Method of
Malfunction
Detection Inverter PC board takes the position signal from UVWN line connected between the inverter and
compressor, and detects the position signal pattern.
Malfunction
Decision
Conditions 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
signal in 2 times cycle is detected.
Supposed
Causes
„
Compressor lock
„
High differential pressure (0.5MPa or more)
„
Incorrect UVWN wiring
„
Faulty inverter PC board
„
Stop valve is left in closed.
Troubleshooting
Check the installation
conditions.
Is the stop valve open?
NO
Is the UVWN wiring
normal?
NO
NO
NO
NO
Is high
differential pressure
starting? (0.5MPa
or more)
YES
YES
YES
Check and see
whether compressor is
short-circuited or
ground.
YES
YES
Are inverter
output voltages the same
for 3 phases?
Does low or
high pressure vary
even instantaneously when
restarting
compressor?
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Open the stop valve.
Connect correctly.
Remedy the cause.
Replace the compressor.
Replace the inverter PC
board (A2P).
Replace the compressor.
(V2793)
NO