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38
48
Ramp Function
Digital set points are integrated according to the ramp function generator. For each change in direction the ramp
time can be independently set from 0 to 39.5 sec (0.01 sec resolution).
The ramp characteristics are as follows:
r1.01
0 to negative values
r1.02
negative values to 0
r1.03
0 to positive values
r1.04
positive values to 0
Time t
r1.01
r1.02
r1.03
r1.04
0
+U
-U
Fig. 4: Explanation of Ramp Parameters
E08 = 0
effects only digital set points, constant time base and linear
E08 = 1
effects all set points, constant rise rate and linear
E08 = 2
not used
The ramp function generator can be immediately set to 0 with a “high” signal at the terminal 18 z.
a)
0
2
4
6
8
10
0
1
2
3
4
Time t
S1.01 = 2.00 V, r1.03 = 4.00 s
S1.01 = 8.00 V, r1.03 = 4.00 s
s
V
b)
0
2
4
6
8
10
0
1
2
3
4
Time t
S1.01 = 2.00 V, r1.03 = 4.00 s
S1.01 = 8.00 V, r1.03 = 4.00 s
s
V
Fig. 5: Ramp function: a) E08 = 0, constant time base, b) E08 = 1, constant rise rate
Controller Structure
Fig. 6 shows the complete controller structure for a proportional valve adjustment displacement
control. It also gives information about the definition and mode of action for the controller parameters.
