Siemens SIPART DR22 Manual page 43

Manual
0 to 100%. At the same time, tS presets the floating time for 0 to 100% change in incremen-
tal setpoint adjustment via the control signals
to 1.
With the setpoint ramp, setpoint switchings can be effected to non-followed-up variables SH
and wi, w , w at S52 = 1 and w
EΔ ES
not suddenly but with the set ramp.
w
w
E
Δw
μ
S
H
tw
safe
external
Setpoint
Setpoint
Figure 1-18 Setpoint switching with ramp
With the control signals tS and tSII the set setpoint ramps can be switched off.
-- Setpoint limits SA, SE
(accordingly SAII, SEII at S1 = 12)
With the parameters SA and SE (oFPA) the effective setpoint w can be limited to minimum
value (SA) and maximum value (SE) in the range from -10 to 110 %.
Exception: Ratio controller (S1 = 4) and ratio cascade, commanded ratio controller (S1 = 6)
-- Follow-up of the ineffective setpoint to the active setpoint (S52)
(accordingly S235 at S1 = 12)
Normally the ineffective setpoint is followed up to the effective setpoint so that the setpoint
switching is bumpless. The internal setpoint (wi), the external setpoint incrementally
adjustable via Δw (w
The safety setpoint SH cannot be followed up. The external setpoint w
inputs can only be followed up indirectly by following up the supplying device on the output
side. To do this the effective w is used as a follow-up variable, assigned to an analog output
and as a follow--up control signal the OR-operation H∨N∨Si, assigned to a digital output.
At S52 = 1 the follow-up is suppressed. This switch setting is always required especially in
follow-up controllers if the internal setpoint represents a kind of safety function or if multiple
setpoint operation is to be run in follow-up controller (S1 = 3).
-- x-tracking (S50)
(accordingly S233 at S1 = 12)
With the structure switch S50 = 1, x-tracking (ratio controller xv-tracking) can be switched
on. This means that the setpoint is followed up to the actual value or the nominal ratio is
followed up to the actual ratio and therefore a control difference xd is reset to 0. The follow
up always takes place when there is no automatic operation (A). This is the case in manual
mode (H), follow-up mode (N), DDC mode and in operation with safety manipulated variable
(Si): A = H∨N∨Si
SIPART DR22 6DR2210
C79000-G7476-C154-03
if the supplying controller has not been followed up
EA ,
tan α = 100 %
tS
Δw · tS
t =
w
100 %
t
) and the external setpoint via the SES (w
EΔ
1.5 Functional description of the structure switches
1.5.4 Controller types (S1, S49 to S53)
Δw. At tS = oFF the adjustment speed goes

= Δw
tw
ES
1 Technical Description
) can be followed up.
via the analog
EA
41