Functions About Restarting; Retry (Under Voltage , Over Current / Over Voltage) - Hitachi NES1-004SB Quick Reference Manual

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
Selection of restart mode
for under voltage trip
(*3) (*5)
Allowable under-voltage
power failure time
Retry wait time before
motor restart for under
voltage trip
the selection of a trip after
undervoltage in the stopped
state (*3)
Number of restarts on
under-voltage trip events
Restart frequency threshold
Trip/retry selection for over
voltage / over current
Selection of retry count
after overvoltage or
overcurrent
Retry wait time after
overvoltage or overcurrent
Active frequency matching,
scan start frequency
Active frequency matching,
scan-time constant
Active frequency matching,
restart frequency select
Data or range of
Function code
data
00
01
02
b001
03
b002 0.3 to 25.0 (s)
b003 0.3 to 100. (s)
00
01
b004
02
00
b005
01
b007 0.00 to 400.0 (Hz)
00
01
02
b008
03
b010 1 to 3 (times)
b011 0.3 to 100. (s)
"0.20 x rated
b028 current" to "2.00 x
rated current"
b029 0.1 to 3000.0 (s)
00
b030 01
02
Chapter 7 Explanation of Functions
Tripping
Restarting the motor with 0 Hz at retry
Starting the motor with an active matching frequency at
retry. (See example 1.) (*2)
Starting the motor with an active matching frequency at
retry. The inverter trips after decelerating and stopping the
motor. (*1) (*2)
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.)
Time to wait until restarting the motor
Disabling the inverter from tripping
Enabling the inverter to trip
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
Retrying the motor operation up to 16 times after
instantaneous power failure
Retrying the motor operation an unlimited number of times
after instantaneous power failure
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.)
Tripping
Restarting the motor with 0 Hz at retry
Starting the motor with an active matching frequency at
retry.
Starting the motor with an active matching frequency at
retry.The inverter trips after decelerating and stopping the
motor.
Number of retries to be made after the occurrence of
overvoltage or overcurrent (*4)
Time to wait until restarting the motor
Current limit for restarting with active matching frequency
Duration of frequency lowering when restarting with active
matching frequency
Frequency set when the inverter output has been shut off
Maximum frequency
Newly set frequency
7 - 51
Description