S-Shaped Ramp - Lenze 8400 StateLine C Reference Manual

16.1.29.7

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 the bSShapeActive input.
 The corresponding S-ramp time can be set under C00182.
16.1.29.8 Additional setpoint
Use the nNAdd_a input to define an additional value (e.g. a correcting signal) and combine
it arithmetically with the main setpoint nNSet_a.
 First, the additional setpoint is led via a ramp function generator with linear
characteristic. Its Ti times can be set in
(deceleration time).
 When the input bNAddInv is set to TRUE, the additional setpoint can be inverted before
having an effect on the ramp function generator.
 When the input bLoad is set to TRUE, the ramp function generator is set to zero for the
additional setpoint and held there without considering the Ti times. The same applies
when the controller is inhibited.
 The following arithmetic combination of main setpoint and additional setpoint can be
selected in C00190:
Value in C00190
0
1
2
3
4
5
16.1.29.9 Application example for the additional load function
The motor control of the drive is provided with a function for automatically carrying along
ramp function generators for "jerk-free" setpoint connection. For speed-controlled drive
tasks, the
nHlgSetValue_a output (e.g. in case of a pulse inhibit, flying restart, controller inhibit).
 In case of a pulse inhibit, the main setpoint generator must be carried along with the
current actual speed value to ensure jerk-free setpoint transfer.
 The actual speed value is carried along automatically if the following wiring is
provided:
– LS_MotorInterface.nHlgSetValue_a  L_NSet_1.nCInhValue_a
– LS_MotorInterface.bHlgLoad  L_NSet_1.bExternalCINH
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Function
nNOut_a = nNSet_a
nNOut_a = nNSet_a + nNAdd_a
nNOut_a = nNSet_a - nNAdd_a
nNOut_a = (nNSet_a * nNAdd_a) / 100 %
nNOut_a = (nNSet_a * 1 %) / |nNAdd_a|
nNOut_a = (nNSet_a * 100 %) / (100 % - nNAdd_a)
LS_MotorInterface SB outputs the current actual speed value via the
L
8400 StateLine C | Reference manual
Function blocks | L_NSet_1
C00220 (acceleration time) and
Info
The additional setpoint nNAdd_a is
not processed.
Internal scaling:
• 100 % ≡ 16384
• 1 % ≡ 164
Function library
C00221
827