Set Value Generators; Ramp Function Generator - Baumuller b maXX BM3000 Operating Manual

Description of the Software Modules and Parameters
4.6

Set Value Generators

4.6.1

Ramp function generator

The ramp function generator is used to generate rising or falling ramps in the Speed Pre-
set 1
modes. Additionally, it is used for controlling braking procedures (Quick Stop, Drive Shut-
down, Inhibit Drive).
The ramp function generator has an input with separately adjustable ramp-up and ramp-
down times. Furthermore the ramp-down time for the Quick Stop function is separately
adjustable.
The input and output values for the ramp function generator are relative quantities
(±100 %) and are referred to the Maximum drive speed parameter (Z110.13–).
The ramp slope for the acceleration and braking procedures is defined by the ramp-up
and ramp-down times. The times correspond to a 100 % change in the set value.
For additional rounding of the ramp-up or ramp-down ramps, a PT
with adjustable time constant is connected after the ramp function generator.
The ramp function generator provides the following control options via the control word
(Z108.1–):
m Inhibit ramp generator (set output permanently to 0, ramp-down at the current limit)
m Stop ramp generator (freeze output value)
m Inhibit ramp generator set value (set input internally to 0, ramp-down on the ramp-down
The following options can additionally be selected via Ramp Generator Mode Z110.2–:
m Selection between a 16-bit parameter (Z110.5–) or a 32-bit parameter (Z110.4–) as
m Blocking of positive or negative set values.
m Reversal of set value sign. The internal processing sequence is inhibit before sign re-
m Switch-off of speed set value synchronization when activating the ramp function gen-
m Adjustment of ramp shape:
m Task selection to process the set values: 
m Speed profile in zero-crossing at change of direction with or without rounding-off.
m The set quick stop time
m The set SS1 stop time
(Z109.1– = 2) and Speed Control
ramp)
input value for the ramp function generator.
versal.
erator.
n Trapezoidal speed profile; stepped acceleration. 
There is a possibility of smoothing the speed by means of a PT
n S-Curve with quadratic speed profile; trapezoidal acceleration.
The set values of the ramp function generator can either be calculated in the RT1 task
(1 ms; default) or in the fieldbus task. The setting is made by bit 16 of the
mode.
n change of set value from 100% to 0%
n change of set value from actual set value at ramp function generator output
to 0%. This causes a constant braking time from all speeds at ramp function gener-
ator output.
Z110.21–
(Z109.1–
Z110.8–
applies to
applies to
Parameter manual b maXX BM3000
Document no.: 5.12001.07
= -3) speed-controlled operating
element (smoothing)
1
element.
1
4
Z110.2–
Z110.3–
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