12
ELECTRICAL SEQUENCE, MCD MACHINES WITH OPERATORLESS INTERLOCK
1. GENERAL
Start by moving "E-Stop" to the "ON" position (pull out).
2. FEED CYCLE
Momentarily depress F.S. (6) to energize feed relay 1CR (6) through 1TR timed contact (6) 21-24 and 1TR
instantaneous (6) 17-18.
!
1CR (7) 19-17 closes to maintain 1CR (6) energized.
!
1CR (4) 21-4 closes to energize feed starter F(3) 6-7, through LS2 feed limit switch (3) and T contact
(3) 5-6.
3. TENSION CYCLE
2LS immediately:
!
Opens (3) 4-5 to de-energize feed starter F (3) 6-7.
!
Closes (4) 4-12 to energize tension starter T (4) 13-7, and energize grip solenoid (5) 11-2 through
1TR (5) 12-11.
!
T closes (5) 14-12 to maintain itself through F (4) 12-13 and 1 CR (6) 3-14.
Motor runs in a tension direction resetting 2LS, contacts (3) closing and (4) opening.
4. WELD CYCLE
Motor continues to run in the tension direction to de-actuate 1LS (9), 3-15 which energizes 1TR (9).
!
1TR (5) 12-11 opens to de-energize the grip solenoid (5) 11-2.
!
1TR (5) 3-14 closes to maintain T (4) through contacts F (4) 12-13, and T (5) 14-12.
!
1TR (6) 17-18 opens to de-energize 1CR (6).
!
1TR timed contact (3) 3-4 closes, anticipating pre-feeding at the end of the weld cycle.
!
1TR timed contact (6) 16-17 opens to prevent another cycle until after pre-feed has taken place.
5. PRE-FEED CYCLE
At the end of the weld cycle, 1LS (9) is actuated, de-energizing 1TR (9) 15-2.
!
1TR (5) 3-14 opens to de-energize T (4).
!
1TR (6) 17-18 closes to allow 1CR (6) to get ready for another cycle.
!
1TR (3) 3-4 timed contact will open,
de-energizing F (3), ending the pre-feed. 1TR should be set to feed strap 3/4 around chute.
!
1TR (6) 16-17 timed contact will close, allowing 1CR (6) to be energized for another cycle, after pre-
feed, through the actuation of the footswitch FS (6) 3-16.
Machine is ready for next strapping cycle.
6. OPERATORLESS CONTACTS (OPTIONAL)
Contacts supplied by purchaser:
!
(1PC) N.C. contact on conveyor motor starter that opens whenever conveyor is running. This
prevents the tension cycle from being started if conveyor is running.
!
(2PC) N.O. contact in conveyor package sensing circuit closes when conveyor has stopped and the
package is in position and ready to receive strap. This signal must be held closed approximately
one second then signal must be removed.
Contacts supplied by Signode, circuit between terminals A and B:
!
(4-5, A&B) N.C. circuit from Signode machine to be wired into conveyor run circuit. This circuit will
open when strapping cycle begins and close after strap has been applied.
NOTES: 2TR timer monitors the strapping cycle. If a malfunction occurs, 2TR times out, stopping the
motor. E-Stop must be pushed OFF to reset the timer.
Approximate 2TR Timer Setting: Pre-feed timer setting plus final feed time plus take-up time for minimum
package size plus 2 seconds.
For Parts & Service 1-877-862-6699
To Next Page
Loading...
