Daikin RTSQ20PY1 Service Manual page 300

Troubleshooting by Indication on the Remote Controller
Troubleshooting
289
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 14 V
(Y1). ∗1
NO
Is the voltage
imbalance applied
to the inverter in
excess of 14 V
(Y1)? ∗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 (L1 ~ L2, L2 ~ L3,
L3 ~ L1) 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.
nighttime (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.
YES
Open phase?
NO
YES
∗1. Measure voltage at the X1M power supply
terminal block.
∗2. Measure voltage at connector R · S · T pins of
the diode module inside the inverter PCB while
the compressor is running.
measure
SiBE31-801_C
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) K2 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.
Troubleshooting