Three-Position Step (S) -- Controller With External Feedback - Siemens SIPART DR22 Manual

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1.5.6.3 S2 = 2:

To control I-acting motorized actuating drives.

In S-controllers with external feedback the "internal position control circuit" is replaced by a real

position controller (with the K-controller output y as a setpoint and the position feedback y

FE6 as an actual value). As a result a manipulated variable limiting of ya and an absolute value

preset of y

and ys are now possible.

With the absolute value preset of y

able via the SES as an absolute value y

low-up input y

(FE5), the freely connectable input range (S4=1) must be used because in the

permanently connected input range, FE5 is not available at S2=2 (see fig. 1--14).

Here too the response threshold of the position controller is preset with the parameters tE (mini-

mum turn-on duration) and tA (minimum turn-off duration) in connection with tY (floating time).

-- Switching on

-- Switching off

-- Hysteresis

-- Pause

If a control deviation of xds ≥ A

dently to continuous contact. xds is reduced by the negative follow-up of the position control

circuit until xds <A

time tA pulse of length tE are output with subsequent pause time tA until xds ≤A

+Δy

-Aea-Aee

Aea Aee

-Δy

These single pulses are also output if xds coming from zero does not reach A

pulses which are not fully transformed into the path change (rotational movement) additionally

calm the control circuit, i.e. in theory (without lag) the single pulses would switch off at 0.25 or

0.5 A

. The opposite direction can only occur at appropriate control deviation after the pause

time tA.

The control difference of the position control circuit xds can be measured at assigmment to an

analog output.

Manual adjustment via the front panel is made at S67=2 here too as an incremental adjustment

by overmodulating the three-position switch so that manual adjustment is possible even when

the position feedback is interrupted.

To simplify commissioning of the position control circuit, the manual manipulated variable is

preset absolutely at S67=0 (manipulated variable of the K-controller) so that the setpoint of the

position control circuit is changed continuously in this structure switch position to enable

optimization (see chapter 4.3). It should be taken into account here that the manual

SIPART DR22 6DR2210

C79000-G7476-C154-03