Advertisement
(b)
(c)
Restart
function
after
instantaneous
power
failure
Retry
function
after
tripping
when
instantaneous
power
failure
(IP)
corresponds
to
the
restart
function
after
instantaneous
power
failure.
In other
words,
when
instantaneous
power
failure
occurs
and
it
is
recovered,
operation
is
restarted
automatically.
If the motor
is rotating
in free-run
conditions,
the
frequency
at which
the
motor
is
rotating
is
picked
up,
and
operation
is
restarted
with
nearly
the
same
speed
rpm.
(When "10" of switch selection
F-28 in the
function
mode
is selected)
However,
in
the
following
cases,
operation
may be started
from
the
lowest
frequency
(normally
called
zero
start).
q)
When
the standby
time
for restart
after
instantaneous
power
failure
recovery
(function
mode
F-36,
IPS-R-T)
is
set
to
3 seconds;
D
When
the output
frequency
exceeds
50 Hz;
G)
When
the output
frequency
is less
than 1/2 of the
basic
frequency with
50 Hz max.
setting;
and
©)
When
the motor
induced
voltage
attenuates
earlier
(for
example,
pump
such
that
a motor
decelerates
in
a few seconds,
and load with high ratio
gear).
Specification
of restart
function
after
instantaneous
power
failure
The
allowable
instantaneous
power
failure
time
is
0.3
second.
I
Advertisement
