Lenze 8400 motec Series, Software Manual, Page: 324 / 376

8400 motec | Software Manual
Function library
L_NSet_1
324
L
Firmware
≤
02.00 - DMS 2.1 EN - 03/2011
12.2.5 Ramp function generator for the main setpoint
The setpoint is now led via a ramp function generator with linear characteristic. The ramp
function generator converts setpoint step-changes at the input into a ramp.
[12-4] Acceleration and deceleration times

t
ir
and t
if
are the desired times for changing between w1 and w2.

The ramps for acceleration and deceleration can be set individually.
–
C00012 : Acceleration time T
ir
– C00013 : Deceleration time T
if

The t
ir
/t
if
values are converted into the required Ti times according to the following
formula:

When the bRfg0 output is set to TRUE, the ramp function generator brakes to 0 along
its deceleration ramp.
12.2.6 S-shaped ramp
A PT1 element is connected downstream of the linear ramp function generator. This
arrangement implements an S-shaped ramp for a nearly jerk-free acceleration and
deceleration.

The PT1 element can be switched on/off via C00134 .

The corresponding S-ramp time can be set under C00182 .
w1, w2 = change of the main setpoint as a function of t
ir
and t
if
RFG-OUT = output of the ramp function generator
RFG-OUT
100 %
w2
w1
t
0 %
t
ir
t
ir
T
ir
T
ir
T
ir
t
ir
100 %
w2 w1
–
---------------------- ⋅
=
T
if
t
if
100 %
w2 w1
–
---------------------- ⋅
=