Function
Description
Remarks
OVT
Prolong deceleration
(continued)
time (it should be
noted that overheat
of incorporated
brake resistor may
catse activation of
this function) .
Instantaneous
To prevent failure when instantaneous If power is switchec
power failure
power failtre lasting for 15 msec or
on after inverter
protection .
longer (also when inverter input power
output shutoff, the
(IPF)
supply is shut off for 15 . msec or
resultant restart durini
longer) occurs, the instantaneous power
motor coasting may
failure protective function is activated
trip the inverter.
and stops (and hold stopped) inverter
output.
To prevent tripping
In this case, alarm output contact is
of the inverter, use
open (across B and C> .
an automatic restart
prevention circuit.
(If power failure is shorter than
15 msec, operation continues normally.)
Under-voltage
If the inverter input power voltage is
Under voltage may
protection
below the specified mimimum voltage,
occur if capacity of
(UVT)
the inverter cotrol circuit cannot function power transformer ir
normally and the specified motor torque
insufficient, or a
cannot be obtained or overheating may
motor having a
occur.
large capacity
connected to the
When the input ’ power voltage goes -down same power line
below about 150V (about 300V in case of is started.
400V class) , undervoltage protective function Cheer the power line
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