Toshiba VF-AS1 Setting acceleration/deceleration time, Automatic acceleration/deceleration

E6581301

5.2Setting acceleration/deceleration time

￿￿￿￿￿: Automatic acceleration/deceleration

￿￿￿￿￿: Acceleration time 1

￿￿￿￿￿: Deceleration time 1

•Function

1)For acceleration time 1 ￿￿￿ programs the time that it takes for the inverter output frequency to go from 0Hz to maximum frequency ￿￿.

2)For deceleration time 1 ￿￿￿ programs the time that it takes for the inverter output frequency to got from maximum frequency ￿￿ to 0Hz.

5.2.1Automatic acceleration/deceleration

This automatically adjusts acceleration and deceleration time in line with load size.

￿￿￿=￿

*Adjusts the acceleration/deceleration time automatically within the range of 1/8 to 8 times as long as the time set with the ￿￿￿ or ￿￿￿, depending on the current rating of the inverter.

￿￿￿=￿

*Automatically adjusts speed during acceleration only. During deceleration, speed is not adjusted automatically but reduced at the rate set with ￿￿￿.

5	Output	When load is small		Output
	frequency [Hz]			frequency [Hz]
	￿￿￿			￿￿
	0			0
				Time [s]
		Acceleration	Deceleration

When load is large
	Time [s]
Acceleration	Deceleration

Acceleration/deceleration time → decrease Acceleration/deceleration time → increase

Set ￿￿￿ (automatic acceleration/deceleration) to ￿ or ￿.

[Parameter setting]

Title	Function	Adjustment range	Default setting
		￿:Disabled (Manual setting)
￿￿￿￿	Automatic acceleration/deceleration	￿:Automatic setting	￿
		￿:Automatic setting (during
		acceleration only)

!When automatically setting acceleration/deceleration time, always change the acceleration/deceleration time so that it conforms with the load.

The acceleration/deceleration time changes constantly with load fluctuations.

For inverters that requires a fixed acceleration/deceleration time, use the manual settings (￿￿￿, ￿￿￿).

!When using a braking resistor or braking unit, do not set the ￿￿￿=￿. Or the regenerative braking resistor may be overloaded.

!Use this parameter after actually connecting the motor.

!Setting acceleration/deceleration time (￿￿￿, ￿￿￿) in conformance with mean load allows optimum setting that conforms to further changes in load.

!When the inverter is used with a load that fluctuates considerably, it may fail to adjust the acceleration or deceleration time in time, and therefore may be tripped.

E-2