User Manual

Chapter 7 Explanation of Functions
7 - 51
7.7 Functions about restarting
7.7.1 Retry (Under Voltage , Over Current / Over Voltage)
(1) Retry (restart) after under voltage / Over Current / Over Voltage
You can select tripping or retrying (restarting) the motor operation as the inverter operation to be
performed at the occurrence of 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 a under Voltage, 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 a 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
Selection of restart mode
for under voltage trip
(*3) (*5)
b001
00 Tripping
01 Restarting the motor with 0 Hz at retry
02
Starting the motor with an active matching frequency at
retry. (See example 1.) (*2)
03
Starting the motor with an active matching frequency at
retry. The inverter trips after decelerating and stopping the
motor. (*1) (*2)
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 for under
voltage trip
b003 0.3 to 100. (s) Time to wait until restarting the motor
the selection of a trip after
undervoltage in the stopped
state (*3)
b004
00 Disabling the inverter from tripping
01 Enabling the inverter to trip
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
Number of restarts on
under-voltage trip events
b005
00
Retrying the motor operation up to 16 times after
instantaneous power failure
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.)
Trip/retry selection for over
voltage / over current
b008
00 Tripping
01 Restarting the motor with 0 Hz at retry
02
Starting the motor with an active matching frequency at
retry.
03
Starting the motor with an active matching frequency at
retry.The inverter trips after decelerating and stopping the
motor.
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 (*4)
Retry wait time after
overvoltage or overcurrent
b011 0.3 to 100. (s) Time to wait until restarting the motor
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 0.1 to 3000.0 (s)
Duration of frequency lowering when restarting with active
matching frequency
Active frequency matching,
restart frequency select
b030
00 Frequency set when the inverter output has been shut off
01 Maximum frequency
02 Newly set frequency