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E6581528
F-64
6
=: If control power is not backed up with an external backup device:
Select this setting if an external backup device is not connected to the inverter’s control terminals +SU and CC.
=: If control power is backed up with an external backup device (alarm signal output):
Be sure to select this setting if an external backup device is connected to the inverter’s control terminals +SU and
CC, and if the main power supply is turned on and off endlessly for reasons of sequence, as shown below, in the
event the external power backup device fails.
R/L1
S/L2
T/L3
+SU
CC
FLA
FLB
FLC
MC
RUN
Control power supply
backup option (CPS002Z)
3
φ
MC
RUN
200V
<Example of a situation in which the main power supply is turned on and off endlessly>
In the example of connection shown above, if the control power backup device (optional) fails and becomes incapable
of supplying control power, control power is supplied from the inverter’s main circuit and operation is continued
without interruption. If the inverter is tripped under these circumstances because of a ground fault or overcurrent (and
if is set to ):
(1) The FL relay is triggered and the main power supply is shut off by the MC.
↓
(2) As a result of shutoff by the MC, the voltage in the inverter’s main circuit and control circuit drop.
↓
(3) As a result of a drop in control voltage, the FL relay recovers from a trip.
↓
(4) The release of the FL relay turns the MC back on.
↓
(5) Operation is restarted and if the problem causing the inverter to be tripped is not eliminated, the inverter is tripped
again, the situation in (1) arises again, and thus the above cycle of operation is repeated endlessly.
If is set to , however, the inverter will cut off the power supply, let the motor coast, and raise a alarm
in the event something unusual (voltage drop) occurs with the power supplied through the +SU and CC terminals.
Once the alarm has been raised, the inverter is not reset even if the control voltage returns to its normal level.
To reset the inverter, turn off the main circuit power supply.
This is the way in which this setting (power reset) prevents the power from being turned on and off endlessly by the
mechanism described above.
=: If control power is backed up with an external backup device (trip signal output):
This setting trips the inverter in the event something unusual (voltage drop) occurs with the external control power
backup device. Trip code is displayed.
In the event of this trip, unlike ordinary trips, the inverter is held tripped regardless of the setting of
(inverter trip retention selection). By holding the inverter tripped, this setting prevents the power from being turned
on and off endlessly.
This setting is effective only when the inverter is used in a standard connection shown in Chapter 2.
Note: Even if is set to while control power is backed up, the inverter will cut off the power supply and issue
a alarm in the event the backup device fails during operation.
If the backup device is already faulty when it is turned on, it will not be recognized to be faulty even if this setting
is selected.