Daikin VRVIII-S Service Manual page 178

SiENBE34-703
Troubleshooting
When the compressor is running,
measure the voltage between
+ and - of electrolytic capacitor
(C+, C-).
∗1: Inverter's Power Transistors Check : Refer to information on P.228, 229.
∗
Check No.3
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Have the
power supply
voltages between L1 and L2,
L2 and L3, and L1 and L3 fallen within
the range of 380 to 415V±10% (50 Hz) and
between L and N within the range
of 220 to 240V±10%
(50 Hz)?
YES
Check the inverter power
transistor. ∗1
Is the power transistor
faulty?
NO
∗
Check No.3
Is the resistance above
standard value?
YES
Is the measured voltage
220 VDC or more?
NO
: Refer to information on P.195.
Troubleshooting by Indication on the remote control
NO
YES
NO
YES
Correct the power supply
voltages.
If L2 or Phase N is open,
replace the switch box.
Replace the inverter PC board
assy (A2P).
Check for the PC board
conditions.
In case of significant failure,
the PC board may have got
faulty due to faulty
compressor. Consequently,
even if the PC board is
replaced, it may get faulty
again. To avoid that, recheck
the compressor for
grounding and for any
broken wires. Furthermore,
even after replacing the PC
board, carry out inspections
on the compressor.
Replace the fan motor
Monitor the voltage
(Instantaneous voltage drop)
Replace the inverter PC board
(A1P).
(S2605)
167