GS-C200 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
GS-C200 Datasheet PDF : 31 Pages
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GS-C200 / GS-C200S
COMPLEX MOVEMENTS SYNCHRONIZATION
In many applications the synchronization of several
movements is quite often required and the GS-C
allows this function to be easily implemented either
by using the Step Enable input or the User in-
put/output pins. In fig.13A and fig.13B the block
diagrams relative to the two solutions are reported.
The solution A is the simplest but it has some
limitations, i.e. it can be used only when the whole
system has to move synchronously. The solution B
is more complex but also more flexible and it allows
the program to control where and when the syn-
chronization must be implemented.
Figure 14. Start-Stop Characteristic.
THE START-STOP SPEED (S command)
SELE CTI O N
A typical Start-Stop curve (as shown on Fig. 14),
shows that for a given driving voltage and phase
current, the highest drive frequency allowed at the
start (Pull-In Rate) is much lower than the one
allowed for the stop (Pull-Out Rate) and that both
are influenced by the load value. Of course the
higher the current level the higher is the available
torque, and the system can be started at a greater
speed. Asignificant increase of the start-stop speed
is obtained when the supply voltage is increased
but in both cases the problem related to the me-
chanical resonance must be considered. It is advis-
able to maintain a significant safety margin against
the system torque limit in order to avoid any prob-
lem due to the friction variation. A commonly ac-
cepted rule fixes the Start-Stop speed equal to the
50% of the maximum theoretical value reported on
the motor data sheet; this takes into account fric-
tion, load inertia variations as well as motor pa-
rameter differences and power supply fluctuations.
Figure 13. Complex Movements Synchronization
SLEW SPEED (T command) SELECTION
The Slew speed is roughly determined by the load
and it can be evaluated by using the following
relation:
F⋅L T⋅N
⋅ 6000
=
t
10
where
F = Strength in Pounds
T = Torque in Ounce/Inch
L = Length in Inches
N = Speed in turn/min.
t = Time in seconds
A
B
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