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


: Brake-equipped motor restart condition selection
• 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 Function
Brake-equipped
motor restart

condition selection
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 (when the ST function is assigned to
the S3 terminal, S3 signal is cut 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]
Starting signal
(S3 and F)
Mechanical brake
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)


: Control power supply backup option failure monitoring
• 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
Control power supply backup

option failure monitoring
: Default (no waiting time for frequencies of 10Hz and less)
: Conditional (no waiting time for frequencies of 20Hz and
less)
20Hz
10Hz
0
Starting waiting time
When assigning the ST function to the S3 terminal,
Set  to  (to cancel its factory default setting:  = ST always active), and
Set  to  (to assign the ST function to the S3 terminal).
Function
: Control power supply not backed up
: Control power supply backed up
: Control power supply backed up
F-63
Adjustment range
[ ]
Note1
Adjustment range
(alarm in the event of a failure)
(tripping in the event of a failure)
E6581528
Default setting

Time [s]
Starting waiting time
Default setting

6