Daikin VRV II-Q RQYQ8-48PY1B Service Manual page 156

Troubleshooting by Remote Controller
Troubleshooting
Note:
*1. Measure voltage at the X1M power supply terminal block.
*2. Measure voltage at terminals R, S and T of the diode module inside the inverter PCB while
146
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Imbalance in
supplied voltage is
in excess of 6 V.
(*1)
NO
Is the voltage
imbalance applied
to the inverter in
excess of 6 V?
(*2)
NO
<When voltage monitoring is possible:>
Using a device capable of
constant recording of power
supply voltage record power
supply voltage between 3
phases (R-S, S-T, R-T) for
about one continuous week.
Power supply voltage imbalance.
No abnormalities are
Even if the power supply voltage is not
observed in the power
unbalanced when measuring it, there are
supply, but the imbalance
many cases where it gets unbalanced during
in voltage recurs.
night-time (around 6:00PM to 10:00PM).
Explanation for users ∗ In accordance with "notification of inspection results" accompanying spare parts.
Give the user a copy of "notification of inspection results" and leave
it up to him to improve the imbalance.
the compressor is running.
YES
Open phase?
NO
YES
measure
SiBE341027
YES
Open phase
Normalize field cause.
Fix power supply voltage
imbalance.
Part or wiring defect
After turning the power supply
OFF, check and repair the
main circuit wiring or parts.
(1) Loose or disconnected
wiring between power
supply and inverter
(2) K2M contact disposition,
fusion or contact is poor.
(3) Loose or disconnected
noise filter
Replace the inverter PCB.
Be sure to explain to the user that
there is a "power supply imbalance"
for which DAIKIN is not responsible.
Service Diagnosis