Selection Of A Restart Condition For The Motor Stopped With A Mechanical Brake; Protection Against A Failure Of The Control Power Backup Device (Optional Cps002Z - Toshiba TOSVERT VF-AS1 Instruction Manual

6.33.23 Selection of a restart condition for the motor stopped with a mechanical brake


• Function
With this function, the motor can be restarted immediately after a stop if it is operated at a frequency of more
than 10Hz (20Hz or less) and stopped with a mechanical brake.
Use this function only when a mechanical brake is used to stop the motor. Using this function for a motor
without a mechanical brake, the inverter may be tripped or fail.
Title

The timing chart in the figure below shows how the motor is operated and stopped with a mechanical brake.
By default, restart waiting time is set to prevent the inverter from being tripped because of the immediate restart of the
motor which started coasting at a frequency of more than 10Hz and stopped (ST signal OFF).
This waiting time, however, is not necessary if a mechanical brake is used to stop the motor more reliably. When using
a mechanical brake to stop the motor, set this parameter  to  to allow the motor to restart immediately after a
stop if it started coasting at a frequency of 20Hz or less and stopped.
Ex. When parameter  is set to .
Output frequency [Hz]
6
Note 1: By default, the restart waiting time shown in the figure is set, and the restart of the motor is delayed by the time
indicated by the dashed line.
Note 2: If the motor started coasting at a frequency of more than 20Hz, it will restart after the expiration of the waiting
time.

6.33.24 Protection against a failure of the control power backup device (optional CPS002Z)


• Function
If the control power backup device (optional CPS002Z) fails to supply power for some reason or other, the
inverter will put out an alarm signal or a trip signal, depending on the setting of this parameter.
Leaving this parameter disabled may cause the main power supply to be turned on and off endlessly if
something unusual occurs, depending on your sequence etc., so you should set this parameter  properly
when using the optional power backup device.
Title

: Brake-equipped motor restart condition selection
Function
Brake-equipped motor restart
condition selection
20Hz
10Hz
0
Starting signal
(ST and F)
Mechanical brake
Starting waiting time
: Control power supply backup option failure monitoring
Function
Control power supply backup
option failure monitoring
Adjustment range
: Default (no waiting time for
frequencies of 10Hz and less)
: Conditional (no waiting time for
frequencies of 20Hz and less)
[ ]
Note1
Adjustment range
: Control power supply not backed up
: Control power supply backed up
(alarm in the event of a failure)
: Control power supply backed up
(tripping in the event of a failure)
F-66
E6581445
Default setting

Time [s]
Starting waiting time
Default setting
