L5" Outdoor Unit: Inverter Compressor Abnormal - Daikin R-410A Service Manual

SiBE39-402A

4.29 "L5" Outdoor Unit: Inverter Compressor Abnormal

L5
Remote
Controller
Display
Applicable
AII outdoor unit models
Models
Method of Malfunction is detected from current flowing in the power transistor.
Malfunction
Detection
Malfunction
When an excessive current flows in the power transistor.
Decision (Instantaneous overcurrent also causes activation.)
Conditions
! Defect of compressor coil (disconnected, defective insulation)
Supposed
! Compressor start-up malfunction (mechanical lock)
Causes
! Defect of inverter PC board
Troubleshooting
Higher voltage than actual is displayed when the inverter output voltage is checked by tester.
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Compressor inspection
The compressor's
coil is disconnected or the
insulation is
defective.
NO
Disconnect the connection
between the compressor and
inverter. Make the power
transistor check mode setting
ON by service mode.
Inverter output
voltage check
Inverter output
voltage is not balanced.
(Normal if within ±5V Must
be measured when
frequency is stable.
NO
There is
instantenious power
drop.
NO
Troubleshooting by Indication on the Remote Controller
YES
YES
YES
Replace the compressor.
Replace the inverter unit.
Correct power supply.
Compressor inspection
Inspect according to the diagnosis
procedure for odd noises, vibration
and operating status of the
compressor.
(V2812)
143