Acceleration And Deceleration Ramps; Settings - ABB ACS800 Firmware Manual

Acceleration and deceleration ramps

Two user-selectable acceleration and deceleration ramps are available. It is possible
to adjust the acceleration/deceleration times and the ramp shape. Switching
between the two ramps can be controlled via a digital input.
The available ramp shape alternatives are Linear
and S-curve.
Linear: Suitable for drives requiring steady or slow
acceleration/deceleration.
S-curve: Ideal for conveyors carrying fragile loads,
or other applications where a smooth transition is
required when changing the speed.
The default setting for Par.
is ACC/DEC DIR for crane control. In this selection, acceleration time 1 and
deceleration time 1 is used when the motor is running in the forward direction, while
acceleration time 2 and deceleration time 2 is used when the motor is running in the
reverse direction. The following figure shows how the acceleration and deceleration
times are used according to the direction of the motor.
Max speed
0
Min speed

Settings

Parameter group
a1
d1
a2
22 ACCEL/DECEL.
22.01 ACCEL/DECEL acceleration/deceleration selection
Motor running
in fwd direction
d2
Motor running
in rev direction
speed
Motor
Linear
a1 = Acceleration time1
Par. 22.02
d1 = Deceleration time1
Par. 22.03
a2 = Acceleration time2
Par. 22.04
t (s)
d2 = Deceleration time2
22.05
Par.
Program features
69
S-curve
t (s)
2