Motor Thermal Protection; Braking Resistance Overload Curve; Selection Of A Restart Condition For The Motor Stopped With A Mechanical Brake - Toshiba Tosvert VF-AS1 Instruction Manual

DC voltage
Rush current
suppression relay

6.33.21 Motor thermal protection

 ~  : PTC thermal selection
 For details, refer to Instruction Manual (E6581339) specified in Section 6.42.

6.33.22 Braking resistance overload curve

 : Braking resistance overload time
 Refer to 5.19 for details.

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.

ON
: 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).
F-67
Adjustment range
[ ]
Note1
E6581442
Default setting

Time [s]
Starting waiting time
6