ABB ACS560, Firmware Manual

Page: 43 / 514

Program features 43
Application control

Reference ramping
Acceleration and deceleration ramping times can be set individually for speed, torque
and frequency reference (
Main menu  Motor control ).
With a speed or frequency reference, the ramps are defined as the time it takes for
the drive to accelerate or decelerate between zero speed or frequency and the value
defined by parameter
46.01 Speed scaling or 46.02 Frequency scaling . The user can
switch between two preset ramp sets using a binary source such as a digital input.
For speed reference, the shape of the ramp also can be controlled.
With a torque reference, the ramps are defined as the time it takes for the reference
to change between zero and nominal motor torque (parameter
01.30 Nominal torque
scale ) .
Variable slope
Variable slope controls the slope of the speed ramp during a reference change. With
this feature a constantly variable ramp can be used.
Variable slope is only supported in remote external control.
Settings
Parameters 23.28 Variable slope (page 228 ) and 23.29 Variable slope rate (page
228 ).
Special acceleration/deceleration ramps
The acceleration/deceleration times for the jogging function can be defined
separately; see section
Jogging (page 73 ) .
The change rate of the motor potentiometer function (page 76 ) is adjustable. The
same rate applies in both directions.