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Troubleshooting by Indication on the Remote Controller
235
Troubleshooting
NO
YES
YES
NO
NO
YES
Is an
imbalance in
voltages applied
to the inverter in
excess of 14V for 460V
units or 6V for
230V units?
(See
∗
2)
Is an
imbalance in
supply voltages in
excess of 14V for 460V
units or 6V for
230V units?
(See
∗
1)
Open phase
Normalize the
field cause.
Parts 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) Magnetic
contact
disposition,
fusion or
contact is
poor.
(3) Loose or
disconnected
noise filter
<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.
No abnormalities are
observed in the power
supply, but the imbalance
in voltage recurs.
Power supply voltage
imbalance
Even if the power supply
voltage is not unbalanced
when measuring it, there
are many cases where it
gets unbalanced during
night-time (around
6:00PM to 10:00PM).
Caution
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
Repair the
power supply
voltage
imbalance.
Open phase?
A
Replace the
inverter PCB.
measure