Siemens simovert masterdrives - Page 695

Technology Option F01 08.2012
6SE7087-6QX70 (Version AN) Siemens AG
9-4 Compendium Motion Control SIMOVERT MASTERDRIVES
♦ Rotary axis (rotating infinitely, without fixed stops, with specification
of the direction or direction of the "shortest path"). A rotary table is
an example of a rotary axis:
360° / 0°
Rotary table
Fig. 9-3 Rotary axis
♦ Roll feed (infinitely rotating rotary axis with "cut-to-length" function).
The figure shows the roll feed as used in a cutting device:
+
-
M
Feed length Outgoing conveyor
Cutting device
+
+
Fig. 9-4 Roll feed
♦ Either the internal motor encoder (resolver, optical encoder,
absolute encoder, incremental encoder) or an external machine
encoder (incremental or SSI absolute encoder) connected to the
machine tool can be used as the position encoder [230..270].
♦ A sophisticated precontrol strategy is implemented in the Motion
Control software: the position ramp-function generator adjusts the
speed and accelerating torque continuously, bypassing the position
controller, in order to achieve an optimum dynamic response and a
negligible following error.
♦ The wear on the mechanical equipment is low, even if the full
dynamic response is utilized, thanks to the position ramp-function
generator with its flexible jerk limitation and acceleration adjustment.