Ramp Function Generator - Lenze 8400 StateLine C Reference Manual

8400 StateLine C | Reference manual
Function library
Function blocks | L_PCTRL_1
16.1.39.2

Ramp function generator

The PID output is led via a ramp function generator with linear characteristic. This serves
to transfer setpoint step-changes at the PID output into a ramp which should be as steep
as possible.
w1, w2 = change of the main setpoint as a function of t
RFG-OUT = output of the ramp function generator
[16-19] Acceleration and deceleration times
 t and t
ir if
 The ramps for acceleration and deceleration can be set individually.
– C00227: Acceleration time t
– C00228: Deceleration time t
 The t /t
ir if
formula:
 The ramp function generator is immediately set to "0" by setting bInAct to TRUE.
16.1.39.3 Operating range of the PID process controller
The value range of the input signal nSet_a and thus the operating range of the PID process
controller can be limited with the following parameters:
 C00231/1: Pos. maximum (default setting: 199.99 %)
 C00231/2: Pos. minimum (default setting: 0.00 %)
 C00231/3: Neg. minimum (default setting: 0.00 %)
 C00231/4: Neg. maximum (default setting: 199.99 %)
842
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RFG-OUT
100 %
w2
w1 t
ir
0 %
T
ir
are the desired times for changing between w1 and w2.
ir
if
values are converted into the required Ti times according to the following
100 %
T t ⋅
----------------------
=
ir ir
w2 w1
–
L
t
ir
T
ir
and t
ir if
T t ⋅
=
if if
Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
t
100 %
----------------------
w2 w1
–