LINK Systems System 2500 PLS - Manual (Page 20)

System 2500 Operating & Installation Manual - Revision 07 2-12
Figure 2
Desired Location of Count Angle
change the ACTIVE COUNT, use the arrow keys to move the cursor to the ACTIVE COUNT
value then key in a new value and press ENTER. For example, if the outputs tied to the counter
should only be active every five strokes (make four strokes with these outputs OFF then one
stroke where the outputs switch normally), enter the number 5 for ACTIVE COUNT. If the
outputs should be active every eight strokes, enter the number 8 for ACTIVE COUNT. The
maximum ACTIVE COUNT value that can be entered is 255.
Remember also that the correct stroke in the cycle that the machine is presently on should be
entered beside COUNT on this screen (see Section 2.4.3.4). This must be done to insure that the
sequencing is correct.
2.4.3.6 COUNT ANGLE
The count angle is the crankshaft angle where the counter will change. To change the count
angle move the cursor to COUNT ANGLE using the arrow keys then key in a new angle (0 to
359 degrees) and press ENTER. In most cases this angle can be set at zero degrees (top of
stroke). However, if the die setup is such that a PLS output must be ON through zero degrees
during the active stroke, the count angle can be set to another value. The reason for this is that it
is not desirable to have the count angle change while the PLS outputs are programmed to be ON.
If this occurs, as soon as the count changes to the active count all PLS outputs tied to the counter
will immediately turn on. Likewise, when the count changes from the active count back to 1, all
PLS outputs tied to the counter will immediately turn off. It is more desirable to have the counter
change at a point in the stroke where all PLS outputs tied to the counter are programmed to be off
so that the change in count will not immediately affect those outputs.
Example: (See Figure 2) PLS output
channels 1 and 5 are tied to the counter.
During the active stroke, channel 1 is to turn
on at 350 degrees and turn off at 10 degrees.
Channel 5 is to turn on at 160 degrees and
turn off at 270 degrees. In this case it would
be better to change the COUNT ANGLE
from 0 degrees to 300 degrees, since at this
point in the stroke channels 1 and 5 are both
off. In this way, the count will change to the
active count at 300 degrees; both output
channels can turn on and off properly at their
programmed setpoints; then when 300
degrees is reached again the counter will
recycle to 1 and the outputs will become
inactive.