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Chapter 4 Explanation of Functions
4 - 33
4.2.27 Retry or trip after instantaneous power failure
(1) Retry (restart) after instantaneous power failure
You can select tripping or retrying (restarting) the motor
operation as the inverter operation to be performed at the
occurrence of instantaneous power failure or undervoltage.
If you specify a retry operation for the selection of restart mode
(b001), the inverter will retry the motor operation for the number
of times set as "b005" after an instantaneous power failure or
the number of times set as "b009" after overvoltage
respectively, and then trip if all retries fail. (The inverter will not
trip if you specify an unlimited number of retries.)
With function "b004" you can select whether to make the inverter trip when an instantaneous power failure
or undervoltage occur while the inverter is in a stopped state.
When selecting a retry operation, also set the retry conditions listed below according to the system to be
driven by the inverter.
Even during a retry operation, the inverter will trip with error code "E09" (undervoltage) displayed if the
undervoltage status continues for 40 seconds.
Item Function code
Data or range of
data
Description
00 Tripping
01 Restarting the motor with 0 Hz at retry
02
Starting the motor with a matching frequency at retry
(See example 1.) (*3)
03
Starting the motor with a matching frequency at retry
The inverter trips after decelerating and stopping the
motor. (*1) (*3)
Selection of restart mode
(*4) (*6)
b001
04
Restarting the motor with an input frequency at retry
(See example 1.) (*3)
Allowable under-voltage
power failure time
b002 0.3 to 25.0 (s)
Restarting the motor when the power failure duration does
not exceed the specified time (See example 1.)
Tripping when the power failure duration exceeds the
specified time (See example 2.)
Retry wait time before
motor restart
b003 0.3 to 100. (s) Time to wait until restarting the motor
00 Disabling the inverter from tripping
01 Enabling the inverter to trip
Instantaneous power
failure/under-voltage trip
alarm enable (*2) (*4)
b004
02
Disabling the inverter from tripping when the inverter is
stopped or while the motor is being decelerated or
stopped after the operation command has been turned off
00
Retrying the motor operation up to 16 times after
instantaneous power failure
Number of restarts on
power failure/under-voltage
trip events
b005
01
Retrying the motor operation an unlimited number of times
after instantaneous power failure
Restart frequency threshold b007 0.00 to 400.0 (Hz)
Restarting the motor with 0 Hz if the frequency becomes
less than the frequency set here during motor free-running
(See examples 3 and 4.)
00 Tripping
01 Restarting the motor with 0 Hz at retry
02 Starting the motor with a matching frequency at retry
03
Starting the motor with a matching frequency at retry
The inverter trips after decelerating and stopping the
motor.
Trip/retry selection b008
04 Restarting the motor with an input frequency at retry
00
Retrying the motor operation up to 16 times after
undervoltage
Selection of retry count
after undervoltage
b009
01
Retrying the motor operation an unlimited number of times
after undervoltage
Selection of retry count
after overvoltage or
overcurrent
b010 1 to 3 (times)
Number of retries to be made after the occurrence of
overvoltage or overcurrent (*5)
Retry wait time after
overvoltage or overcurrent
b011 0.3 to 100. (s) Time to wait until restarting the motor
00 Frequency set when the inverter output has been shut off
01 Maximum frequency
Active frequency matching,
restart frequency select
b030
02 Newly set frequency
Active frequency matching,
scan start frequency
b028
"0.20 x rated
current" to "2.00 x
rated current"
Current limit for restarting with active matching frequency
Active frequency matching,
scan-time constant
b029 0.10 to 30.00 (s)
Duration of frequency lowering when restarting with active
matching frequency
b001: Selection of restart mode
b002: Allowable under-voltage power failure time
b003: Retry wait time before motor restart
b004: Instantaneous power failure/under-voltage
trip alarm enable
b005: Number of restarts on power
failure/under-voltage trip events
b007: Restart frequency threshold
b008: Selection of retry count after undervoltage
C021 to C025: Terminal [11] to [15] functions
C026: Alarm relay terminal function
Related code