5-24
Restar
)
The inver
tion that DC link
bus volta
load of th
short,
the voltag
ot be great enough for a momentary power failure to be recognized,
estart mode (after a
er is restored, the
in
hrough a
charging stage and enters
-run state. When a
mome
y pow
s, the p
sequen
circuit
as t
situation, the inv
s
ready-to-run state. If a run command i
restart processing in accordance with t
ction). If no run command has
been
ed w
wait p
recovery from m
ilu
starting frequen
e th
recovery of power, or install a mechani
When run commands are entered via t
the mode (F02 = 0) in which the rotatio
FWD
or
REV
. In the modes where the
fixed (F02 = 2 or 3), it is retained
inside the invert
start wil
state.
t mode after momentary power failure (Basic operation
ter recognizes a momentary power failure upon detecting the condi
ge goes below the undervoltage detection level, while the inverter is running. If the
e motor is light and the duration of the momentary power failure is extremely
e drop may n
and the motor may continue to run uninterrupted.
Upon recognizing a momentary power failure, the inverter enters the r
recovery from momentary power failure) and prepares for restart. When pow
verter goes t
n initial
the ready-to
ntar
ce
er failure occur
s may also drop so
rter waits 2 second
ower supply voltage for external circuits such as relay
o turn the run command off. In consideration of such a
for a run command input after the inverter enters a
s received within 2 seconds, the inverter begins the
he F14 data (Mode sele
e
receiv
ithin 2-second
omentary power fa
cy. Therefore, ensur
eriod, the inverter cancels the restart mode (after a
re) and needs to be started again from the ordinary
at a run command is entered within 2 seconds after a
cal latch relay.
he keypad, the above operation is also necessary for
nal direction is determined by the terminal command,
rotational direction is
er so that the re
l begin as soon as the inverter enters the ready-to-run
• When the power is restore
seconds for input of a run
• If the "Coast to a stop" terminal command
BX
is entered during the power failure,
the inverter gets out of the restart mode and enters the normal running mode. If a
d, the inverter will wait 2
command. However, if the allowable momentary power failure time (H16) elapses
after the power failure was recognized, even within the 2 seconds, the restart time
for a run command is canceled. The inverter will start operation in the normal
starting sequence.
run command is entered with power supply applied, the inverter will start from the
normal starting frequency.
