Adaptation Of The S-Controller To The Actuating Drive - Siemens SIPART DR22 Manual

4 Commissioning

4.3 Adaptation of the S-controller to the actuating drive

4.3 Adaptation of the S-controller to the actuating drive
D S-controller with internal feedback (S2 = 1)
The floating time of the actuating drive is set with the online parameter tY (1 to 1000 s);
Attention:the factory setting is oFF !
The online parameter tE 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 gentle 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 control-
led variable diminishes with increasing turn-on duration.
The factory setting is 200 ms for tE. This corresponds to a y resolution in a 60 s actuating
drive of:
100 % · tE
Δy = =
tY
The minimum possible resolution is transposed with the system line amplification Ks to the
controlled variable:
Δx = K · Δy
s
The parameter tA (minimum turn-off time) should be chosen at least great enough that the
actuating drive is safely disconnected under consideration of the power switches connected
before it before a new pulse appears (especially in the opposite direction). The greater the
value of tA, the more resistant to wear the switching and drive elements connected after the
controller operate and the greater the dead time of the controller under some circumstances.
The value of tA is usually set identical to the value of tE.
tA = tE = 120 to 240 ms are recommended for 60 s actuating drives. The more restless the
controlled system, the greater the two parameters should be selected if this is reasonably
justified by the controller result.
According to the set tE and the resulting ∆y or ∆x, the response threshold AH I must be set
or for the controller II AH II. The following condition must be satisfied:
AH I or AH II >
Otherwise the controller outputs positioning increments although the control deviation has
reached the smallest possible value due to the finite resolution. For setting of AHI or AHII
see chapter 4.4, page 219.
D S-controller with external feedback (S2 = 2)
The position control circuit is optimized with the online parameter tY. The same relationships
apply as in the S-controller with internal position feedback whereby the dynamic of the posi-
tion control circuit (non-linearities, follow-up) is added to the criteria of the processability of
the positioning increments by the final control element. It will usually be necessary to select
218
100 % · 200 ms
= 0.33 %
60 s
∆x
orAH I or AH II >
2
Ks · tE · 100 %
2 · ty
SIPART DR22 6DR2210
C79000-G7476-C154-03
Manual