Siemens IP-Module Manual Pagina 66

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IP 266 Fundamentals of Positioning
4.3.3 Relationships Between a
(t)
, v
(t)
and s
(t)
In order to position to a defined target, the drive must be moved at a specific speed.
The IP 266 computes the acceleration and deceleration rates from the machine
data. The result is the basic characteristic of a positioning operation.
Figure 4-7. Relationships Between a
(t)
, v
(t)
and s
(t)
(Characteristic
of a Positioning Operation)
v
(t)
s
(t)
Accele-
ration
Constant speed
t
t
Decele-
ration
a
(t)
0
t
The slope of the speed ramp is a measure of the acceleration rate. It is specified in
the unit [m/s
2
], and is generally obtained from the following equation:
v
a=
t
EWA 4NEB 812 6057-02
4-7
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