Applied Motion STM23R-2ND - Manual (Page 21)

21
STM23R Hardware Manual 920-0056C
5/5/2015
At lower step resolutions such as 200 steps/ rev (full step) and 400 steps/rev (half step),
motors run a little rough and produce more audible noise than when they are micro-
stepped (2000 steps/rev and beyond). The STM23R includes a feature called “mic-
rostep emulation”, also called “step smoothing”, that can provide smooth motion from
coarse command signals. If you set switch 6 to the ON position, this feature is automati-
cally employed to provide the smoothest possible motion from a less than ideal signal
source.
Because a command filter is used as part of the step smoothing process, there will be a
slight delay, or “lag” in the motion. The graph below shows an example of the delay that can occur from using
the step smoothing filter.
Step 5: Step Pulse Type
Most indexers and motion controllers provide motion commands in the “Step and Direction” format. The Step
signal pulses once for each motor step and the direction signal commands direction. However, a few PLCs use
a different type of command signal: one signal pulses once for each desired step in the clockwise direction
(called STEP CW), while a second signal pulses for counterclockwise motion (STEP CCW). The STM23R can
accept this type of signal if you adjust switch 8 as shown in the digram. In STEP CW/STEP CCW mode, the CW
signal should be connected to the STEP input and the CCW signal to the DIR input.
6
ON
6
OFF
SMOOTHING