Setting Of Actuating Time In K-Controllers (S2 = 0); Adaptation Of The S-Controller To The Actuating Drive; S-Controller With Internal Feedback - Siemens SIPART DR21 Manual

Manual
6.2

Setting of actuating time in K-controllers (S2 = 0)

D Actuating time tP, tM
Set the actuating time tP (open) or tM (closed) to the actuating time of the following actuator. If
the control circuit is to be settled additionally, e.g. to avoid hard impact on the actuating drive,
tP, tM can be further increased in Automatic operation.
The value of tP is usually set identical to the value of tM.
6.3

Adaptation of the S-controller to the actuating drive

Output Two-position controller for heating/cooling (S2 = 1)
D
The setting range y can be divided into two sections. The offline-parameters Y1 and Y2 and
the online-parameters YA and YE determine tehse sections(see fig. 3-24, page 98.)
The period duration and the shortest turn-on- and turn-off duration are determined in the
cooling branch (section [YA, Y1]) by the online-parameters tM and tA and in the heating
branch (section [Y2, YE]) by the online parameters tP and tE.
The period durations tP and tM should be chosen as great as possible, whereby the follow-
ing should be observed:
- Great values of tP and tM result in low wear of the internal and external switchgear.
- Large values cause a periodic fluctuation of the controlled variable x which is greater the
faster the controlled system is.
D S-controller with internal feedback (S2 = 2)
Set the actuating time of the actuating drive (e.g. 60 s) with the online-parameters tP, tM (0.1
to 1000 s).
NOTICE
The factory setting is 1 s!
The online-parameter tE (minimum turn-on duration) should be selected at least great
enough that the actuating drive starts moving reliably under consideration of the power
switches connected before it. The greater the value of tE, the more resistant to wear and
more gently the switching and drive elements connected after the controller operate. Large
values of tE require a greater dead band AH in which the controller cannot control defined
because the resolution of the controlled variable diminishes with increasing turn-on duration.
The factory setting for tE is 200 ms. This corresponds to a y-resolution in a 60-s-actuating
drive of:
100 % · tE
Δy =
tP (or tM)
SIPART DR21
C73000-B7476-C143-08
100 % · 200 ms
=
60 s
6.2 Setting of actuating time in K-controllers (S2 = 0)
= 0.33 %
6 Commissioning
183