
4-8
4.4 Drive control
F
UNCTIONAL
D
ESCRIPTIONS
8310/8610-8
4.4.2 Positioning characteristic
The characteristic of the positioning curve (e.g. soft start) is determined by the
jerk parameter, i.e., the jerking time (refer to storage location 3/39).
The larger the jerking time is programmed, the smaller is the jerk, i.e., the
softer the drive runs during starting and stopping. The following diagram illus-
trates these relations by the example of 3 different jerking times (t
j
):
s [DispU]
speed
position
nom.
t
2
t
1
t
3
: example 1 for t
: example 2 for t
: example 3 for t
j1
j2
j3
t < t < t
j1
j2
j3
v [DispU/sec]
jerk
accelerating,
braking
a
1
2
j
j
3
j
+
b+
j [DispU/sec ]
3
a, b [DispU/sec ]
2
v
(max)
t
j2
(jerk > jerk > jerk )
1
2
3
t
E180016B
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