Rapid-Air SERVO FEED GAG FEED: 300 SERIES - Manual (Page 14)

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SERVO INTERFACING EXPLANATION
A. TAUT STOCK INPUT (J55-3)
This is a normally open contact from a switch or device that monitors the loop of
material prior to the servo feed. When the material reaches a point that it trips the
switch, a taut stock has been reached. This input, when received, immediately drops
the automatic which stops the feed in progress. The material should be repositioned in
the die before restarting the automtaic sequence.
This input also could be used as a “No Stock” switch that would monitor whether or not
there is material available to feed.
B. ANTI-BACKUP INPUT (J55-4)
Whether the anti-backup rolls where purchased with the unit or came on the unit
standard, they can be activated to raise in the automatic cycle. The anti-backup rolls,
by design, keep the material from sliding back during the pilot operation. They can
become a hinderance if the material tends to walk to one side or the other during the
feed cycle.
The anti-backup switch was designed in for this reason. If this problem is being
experienced then a switch or a cam switch with a normally open contact can be wired in
from the press. Usually this switch is activated when the press is at 180 degrees or
when the die is closed to be sure that the material is being held in postion. The rolls will
raise for the amount of degrees that the switch is activated, letting the material
reposition itself in line with the die. It is crucial that this switch is not activated for too
long a time as when the die releases the material, the material will slide back which will
cause a misfeed. This feature has to be used in conjunction with the main rolls being
raised or it will not give the desired results as one of the rolls will be holding the
material from moving.
C. ENABLE INPUT (J53-4)
The enable input is shipped from the factory, jumpered, so that the Pac-Sci unit is
ready to work after the initialization procedure is complete.
If it is desired that the servo controls are not functional until other equipment or safety
source is activated before this unit can function then a normally open contact can be
interfaced to this input. If at any time during the feed cycle the input changes state then
the feed will stop at this position. If feeding stock, the reference will be lost and the
stock will have to be manually repositioned to the correct location. The automatic cycle
will be dropped and have to be restarted.