4-34
Instantaneous power failure / under-voltage
Instantaneous stop and start
(1) You can select whether the inverter trips or retries (restart)
when an instantaneous power failure/under-voltage occurs.
When retry function is selected with b001, and an
instantaneous Stop/under-voltage trip occurs restart is tried
16 times and a trip will occur after 17 times.
And when retry function is selected, and an over-current or
an over-voltage occurs, restart is tried 3 times and a trip will
occur on the forth time.
When an instantaneous power failure/under-voltage occurs,
you can select execution of trip with b004.
To select a retry function with b001, set the following retry mode correspondent to each system.
Set item
Function code
Data
Description
00
Trip.
01
Restart from 0Hz on retry.
02
Start equaling frequency on retry. (Example 1)
Retry selection
b001
03
Start f-equaling and stop decelerating on retry.
After stop, start trip. (Note 1)
Allowable under-
voltage power failure
time
b002
0.3-1.0
Units : second
If the instantaneous power failure time is shorter than the set
time, a restart will occur. (Example 1) If the instantaneous
stop time is longer than set time, trip. (Example2)
Retry wait time
b003
0.3-100.
Units : second
Delay before motor restart time.
00
Invalid
Trip isn’t caused and alarm isn’t output.
01
Valid
Trip is cause and alarm is output.
Instantaneous power
failure/under-voltage
trip during stop
(Note 2)
b004
02
Invalid
Trip isn’t caused and alarm isn’t output during stop and
deceleration by stop command.
00
Restart to 16 times on instantaneous stop under-voltage.
Instantaneous power
failure/under-voltage
retry time selection
b005
01
Restart freely on instantaneous stop under-voltage.
Frequency setting to
match
b007
0.00-
400.0
Units : Hz
When the frequency of the motor during free-run is less than
this set frequency, restart with 0Hz is caused. (Example 3,4)
(Note 1) When trip of the over voltage or over current etc. occurs in the deceleration midway an instantaneous
power failure error (E16) is displayed and operates free-run. In this case make the deceleration time
of long
(Note 2) When using control power supply terminal R0-T0 and connecting DC voltage (P-N) to R0-T0, an
under-voltage may be detected at power off and give trip signal. If this may cause any problem to your
system, set data in 00 or 02.
F-equaling start: The inverter reads the motor r/m and direction and restarts the inverter to match these
readings.
Chapter 4 Explanation of function
b001
:Retry selection
b002 :Allowable under-voltage power failure time
b003
:Retry delay time
b004
:Instantaneous power failure under-voltage
trip during stop
b005 :Instantaneous power failure under-voltage
retry time time selection
b007
:frequency setting to match
C021-C022 :Intelligent output terminal
C026 :Alarm relay output
Relation code
