ABB ACS580 Firmware Manual page 219

No. Name/Value
23.28 Variable slope
Off
On
23.29 Variable slope rate
2...30000 ms
Description
Activates the variable slope function, which controls the slope
of the speed ramp during a speed reference change. This
allows for a constantly variable ramp rate to be generated,
instead of just the standard two ramps normally available.
If the update interval of the signal from an external control
system and the variable slope rate
are equal, speed reference
a straight line.
Speed reference
Speed
reference
t
A
t = update interval of signal from an external control system
A = speed reference change during t
This function is only active in remote control.
Variable slope disabled.
Variable slope enabled (not available in local control).
Defines the rate of the speed reference change when variable
slope is enabled by parameter
For the best result, enter the reference update interval into
this parameter.
Variable slope rate.
(23.29 Variable slope
(23.02 Speed ref ramp
23.02 Speed ref ramp output
23.28 Variable slope.
Parameters 215
Def/FbEq16
Off
rate)
output) is
Time
0
1
50 ms
1 = 1 ms