Lenze E84AVHC Series - 14.1.118.2 Ramp function generator; 14.1.118.3 Operating range of the PID process controller; 14.1.118.4 Evaluation of the output signal

Firmware ≤ 05.00 - DMS 4.2 EN - 02/2010 L 1039
8400 HighLine | Parameter setting & configuration
Function library
Function blocks | L_PCTRL_1
14.1.118.2 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.
[14-39] 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.
– C00227
: Acceleration time t
ir
– C00228
: Deceleration time t
if
 The t
ir
/t
if
values are converted into the required Ti times according to the following
formula:
 The ramp function generator is immediately set to "0" by setting bInAct to TRUE.
14.1.118.3 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 %)
14.1.118.4 Evaluation of the output signal
After the limitation, the output signal is evaluated with the influencing factor nInflu_a.
The evaluation is activated/suppressed along a ramp when the input bActivateRamp is set
to TRUE. The ramp times are set with the parameters "Influence acceleration time"
(C00243
) and "Influence deceleration time" (C00244).
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 w
1
–
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-
⋅=
T
if
t
if
100 %
w2 w
1
–
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-
⋅=
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