Rapid-Air SERVO FEED: 200T & TX - Manual (Page 13)

12
SERVO INTERFACING EXPLANATION
A. TAUT STOCK INPUT (J52)TBI-6)
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, as the progression was lost when the
taut stock occurred.
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 (J52)TBI-8)
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 tend to walk to one side or the other during the
feed cycle.
The anti-backup switch can be used as a solution. If the material walking 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 position.
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 (J4-Pin 5 & 6))
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 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.