Daikin VRV II RXYQ5MATL, Service Manual

Page: 218 / 331

Si39-504 Troubleshooting by Indication on the Remote Controller
Troubleshooting 207
3.33
“
L5
”
Outdoor Unit: Inverter Compressor Abnormal
Remote
Controller
Display
L5
Applicable
Models RXYQ5MA~48MA
Method of
Malfunction
Detection Malfunction is detected from current flowing in the power transistor.
Malfunction
Decision
Conditions When an excessive current flows in the power transistor.
(Instantaneous overcurrent also causes activation.)
Supposed
Causes
„
Defect of compressor coil (disconnected, defective insulation)
„
Compressor start-up malfunction (mechanical lock)
„
Defect of inverter PC board
Troubleshooting
Compressor inspection
Higher voltage than actual is displayed when the inverter output voltage is checked by tester.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Inverter
output
voltage check
Inverter output
voltage is not balanced.
(Normal if within 380
±
10V
(YL) or 220
±
5V(TL))
Must be measured
when frequency
is stable.
Replace the compressor.
Compressor inspection
Inspect according to the diagnosis
procedure for odd noises, vibration
and operating status of the
compressor.
NO
Replace the inverter unit.
YES
YES
Correct power supply.
YES
The compressor's
coil is disconnected or the
insulation is
defective.
NO
NO
Disconnect the connection
between the compressor and
inverter. Make the power
transistor check mode setting
ON by service mode.
There is
instantenious power
drop.