Manual

9
Installation and Maintenance Manual
Chapter 3: Programming
on a scale factor corresponding to the 360-degree rotation of the resolver. Example: In the foregoing
example, with a 360 scale factor, a dwell on of 0 and a dwell off of 100 would look like this:
0
100 359
0 20 80 100 180 200 270 359
The shaded area represents the area where the selected limit output relay is energized. Programmable
limit switch outputs offer a unique function which normal rotating cam limits cannot, namely, the ability to
turn a limit on or off more than once in a 360-degree cycle. Multiple dwells allow several dwell on
and dwell off values to be programmed for a particular limit. Example: Dwell on settings of 20,
100, 200, and dwell off settings of 80, 180, 270 would look like the following:
Another feature of programmable limits is the ability of programming a dwell on or a dwell off only.
If only a dwell on setting is programmed, the output will activate at the dwell on setting and remain
on to 359 degrees. Example: Dwell on setting of 180 and dwell off not programmed will result in
the following:
0 180
359
Conversely, if only a dwell off setting is programmed, the output will activate from 0 degrees to the
dwell off setting. Example: Dwell on not programmed, dwell off set at 180 degrees will result in
the following:
0 180 359
The programmable limits also have the ability to shift the dwells to turn on sooner. This can be done
to compensate for mechanical lag in the devices they are controlling as the machine speed increases.
(See Section 3.17: Linear Speed Offset for more details). Limits can also be programmed to turn off
based on timed settings.