Siemens SIMODRIVE 611 universal Function Manual page 379

01.99
! not 611ue !
Speed For speed pre–control, in addition a speed/velocity setpoint can be di-
pre–control rectly entered at the speed controller input. This additional setpoint can
P0203 be weighed with a factor.
P0204:8
The speed pre–control improves the control characteristics of the posi-
P0205:8
tion control loop in so much that for a constant velocity, the following
P0206:8
error is almost completely reduced, i.e. to almost zero.
n
set
pre–control
P0204:8
P0210:8
Inter–
polator
x
P0205:8 P0206:8
set
Fig. 6-15 Speed pre–control
Setting the speed The following prerequisites must be fulfilled to set the speed pre–con-
pre–control trol:
S
After that, the speed pre–control can be set as follows:
1. Set P0203 = 1 ––> this activates speed pre–control
2. Set P0204:8 to 100 % (this is the standard value)
3. P0206:8 =
4. P0205:8 = determine the value
E Siemens AG 2005 All Rights Reserved
SIMODRIVE 611 universal Description of Functions (FBU) – 04.05 Edition
6.2 Positioning mode (P0700 = 3, from SW 2.1)
Pre–control
(activated/de–activated
with P0203)
Pos.
cntrller
–
P1012.8
x
act
The current, speed and position control loop must be optimized.
Set the approximate value from the sum of
P1502:8 (time constant, speed setpoint filter 1) and
P1503:8 (time constant, speed setpoint filter 2)
Setting goal is: Positioning without undershoot or overshoot
Recommendation:
Traverse the axis using the traversing blocks, and evaluate position-
ing by plotting the position actual value using the trace function (re-
fer to Chapter 7.4.2).
With the trace function, the approach characteristics of the axis can
be zoomed in using the appropriate scaling and then evaluated.
6 Description of the Functions
Clock cycle adaptation
1st 2nd
speed speed
+
set– set–
point point
filter filter
Speed
control-
ler
6
6-379