Toshiba VF-AS1 Increasing starting torque, Manually setting acceleration/deceleration time

E6581301

5.2.2 Manually setting acceleration/deceleration time

Set acceleration time from 0 (Hz) operation frequency to maximum frequency ￿￿ and deceleration time as the time when operation frequency goes from maximum frequency ￿￿ to 0 (Hz).

Output frequency [Hz]

￿￿￿

0

￿￿￿=￿ (Manual setting)

Time [s]

￿￿￿￿￿￿￿￿

[Parameter setting]

Title	Function	Adjustment range	Default setting
￿￿￿￿	Acceleration time 1	￿￿[Note]~￿￿￿￿ sec.	According to model
			￿ Refer to page K-48.
￿￿￿￿	Deceleration time 1	￿￿[Note]~￿￿￿￿ sec.	According to model
			￿ Refer to page K-48.

Note:The minimum setting of acceleration and deceleration times have been set respectively at 0.1 sec. by default, but they can be changed within a range of 0.01 sec. (setting range:0.01~600.0 sec.) by changing the setting of the parameter ￿￿￿ (default setting).

￿ For details, refer to Section 5.20.5 !When using a setting of ￿￿=￿,￿,￿,￿ or ￿ the drive may not operate normally without a motor connected. ,It will

be able to run normally by connecting the motor.

!If the programmed value is shorter than the optimum acceleration/deceleration time determined by load conditions, overcurrent stall or overvoltage stall function may make the acceleration/deceleration time longer than the programmed time. If an even shorter acceleration/deceleration time is programmed, there may be an overcurrent trip or overvoltage trip for inverter protection.

￿For details, refer to Section 13.1.

5.3Increasing starting torque

￿￿￿￿￿: Automatic torque boost

•Function

Simultaneously switches inverter output V/f control and programs motor constants automatically (auto-tuning function 1) to improve torque generated by the motor. This parameter integrates the setting of special V/f control selection such as automatic torque boost or vector control.

￿Constant torque characteristics (default setting)

￿Automatic torque boost+auto-tuning 1

￿Sensorless vector control 1+auto-tuning 1

Note: Square reduction torque control, sensor vector control (optional), etc. can be selected using the V/f control mode selection parameter ￿￿.

￿For details, refer to Section 5.6.

[Parameter setting]

Title	Function	Adjustment range	Default setting
		￿: Disabled (Always ￿ is displayed.)
￿￿￿￿	Automatic torque boost	￿: Automatic torque boost+auto-tuning 1	￿
		￿: Sensorless vector control 1+auto-tuning 1

Note: Parameter displays on the right always return to ￿ after resetting. The previous setting is displayed on the left.

Ex. ￿ ￿

E-3