Toshiba VF-AS1 DC voltage Rush current suppression relay, Refer to 5.19 for details

E6581301

DC voltage

￿￿￿￿￿

Rush current suppression relay

ON

6.33.21 Motor thermal protection

￿￿￿￿￿~

￿￿￿￿￿: PTC thermal selection

￿For details, refer to Instruction Manual (E6581339) specified in Section 6.42.

6.33.22Braking resistance overload curve

￿￿￿￿￿: Braking resistance overload time

￿Refer to 5.19 for details.

6.33.23Selection 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.!

6

Title	Function	Adjustment range	Default setting
	Brake-equipped	￿: Default (no waiting time for frequencies of 10Hz and less)
￿￿￿￿￿	motor restart	￿: Conditional (no waiting time for frequencies of 20Hz and	￿￿
	condition selection	less)

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]

20Hz

10Hz			[Note1]
0
					Time [s]!
Starting signal
(S3 and F)!
Mechanical brake
	Starting	waiting			Starting	waiting
				!
!

!!

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).

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.

F-67