S2 = 1: Three-Position Step (S) -Controller With Internal Feedback - Siemens SIPART DR22 Manual

1 Technical Description
1.5 Functional description of the structure switches
1.5.6 Controller output structures (S2, S61 to S68)
1.5.6.2 S2 = 1:
To control I-acting motorized actuating drives.
In S-controllers with internal feedback the K-controller is followed by an internal position
controller. The positioning control circuit consists of a comparator with following three-position
switch with hysteresis and an integrator in the feedback. The I-function of the actuator is
simulated by the integrator with adjustable floating time tY (parameterization mode onPA) which
replaces the position feedback. To ensure the internal integrator and the K-controller output do
not drift apart or into saturation in time, both are set back rhythmically by the same amount
(synchronized). The y-output is only a relative manipulated variable (y'). It is therefore not
possible to perform a manipulated variable limiting of ya and an absolute value preset of y
ys. The safety manipulated variable ys is preset as a direction-dependent continuous contact.
At YS 50 % (oFPA), --Δy switches, at YS ≥ 50 %, +Δy switches to continuous contact so that
<
the end positions represent the safety position. The position controller has an adjustable
minimum pulse length (tE) and pause (tA) with which the response threshold of the position
controller is set indirectly:
-- Switching on
A
ee
-- Switching off
A
ea
-- Hysteresis
A -- A
ee
100 % ⋅ tA
-- Pause
A =
a
-- tY set floating time (parameterization mode onPA)
After a pulse pause A
ee
length tE is output. A
ea
A can be set up after an actuating pulse as a deviation until an actuating pulse is output in the
a
same or opposite direction. When time tA has expired, the position controller reacts accordingly
to the set tE.
Setting criteria of tA and tE, see chapter 4.3, page 218.
The position feedback y
lers with internal feedback. If it is not connected, S67 is set to 0, the y-display (14) is then dark.
104
Three-position step (S) -controller with internal feedback
100 % ⋅ tE
= 2
tY
100 % ⋅ tE
=
tY
100 % ⋅ tE
=
ea
tY
tY
must be set up at least as a deviation until an actuating pulse with
can remain as a constant control error of the position control circuit.
via FE6 is only used to display the manipulated variable in S-control-
R
Manual
and
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SIPART DR22 6DR2210
C79000-G7476-C154-03