SJ300 Inverter
Oper
ati
ons
and Monitor
ing
4–51
Instantaneous
Power Failure /
Under-voltage
Signal
An instantaneous power failure (complete loss) or under-voltage condition (partial loss) of
inverter input voltage can occur without warning. SJ300 Series inverters can be configured to
respond to these conditions in different ways. You can select whether the inverter trips or retries
(restart attempt) when an instantaneous power failure or under-voltage condition occurs. You
can select the retry function with parameter B001.
When enabled, the Retry Function operates in the following ways:
•
Under-voltage conditions
– When an instantaneous power failure or under-voltage condi-
tion occurs, the inverter will attempt to restart up to 16 times. A trip condition will occur on
the 17th attempt, which must be cleared with the Stop/Reset key.
•
Over-current/voltage conditions
– When retry function is selected and an over-current or
an over-voltage condition occurs, a restart is attempted 3 times. A trip will occur on the 4th
failed restart attempt. Use parameter B004 to select the trip and alarm response to instanta-
neous power failure and under-voltage conditions. The following table shows the related
parameters to these power fault conditions, and timing diagrams are on the next page.
Code
Function
Data or Range
Description
B001
Selection of
automatic restart
mode
00
Alarm output after trip, automatic
restart disabled
01
Restart at 0 Hz
02
Retry with frequency matching to
present motor speed
03
Retry with frequency matching
followed by deceleration to stop—
then trip alarm
B002
Allowable under-
voltage power failure
time
0.3 to 1.0 sec.
The amount of time a power input
under-voltage can occur without
tripping the power failure alarm. If
under-voltage exists longer than this
time, the inverter trips, even if the
restart mode is selected. If it exists
less than this time retry will be
attempted.
B003
Retry wait time
before motor restart
0.3 to 100 sec.
Time delay after a trip condition goes
away before the inverter restarts the
motor
B004
Instantaneous power
failure / voltage trip
alarm enable
00
Disable
01
Enable
02
Disable during stop and ramp to stop
B005
Number of restarts
on power failure /
under-voltage trip
events
00
Restart up to 16 times on instanta-
neous power failure or under-voltage
01
Always restart on instantaneous
power failure or an under-voltage
condition
B007
Restart frequency
threshold
0.00 to 400.0 Hz
When frequency of the motor is less
than this value, the inverter will
restart at 0 Hz
Содержание SJ300 Series
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Страница 213: ...Inverter System Accessories In This Chapter page Introduction 2 Component Descriptions 3 Dynamic Braking 6 5 ...
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