
2015
OPERATIONS
MANUAL
70
SAFETY PLC
WHEN THE MACHINE IS IN ANY E-STOP CONDITION, THE FILM
DRIVE AND JAW DRIVE SERVO CONTROLLERS ARE DISABLED BY
REMOVING THE COMMON FROM THE ENABLE CIRCUIT THROUGH THE
SAFETY PLC.
TO ACTIVATE THE FILM DRIVE SERVO CONTROLLER THE
OPERATOR MUST ACTIVATE (S02) ON THE SAFETY PLC. THIS IS DONE BY
PULLING OUT THE E-STOP BUTTON. (S02) ALSO ACTIVATES A SET OF
MOTOR CONTACTORS THAT MECHANICALLY BREAK THE MOTOR
POWER CABLE FROM THE CONTROLLER POWER SOURCE.
TO ACTIVATE THE JAW DRIVE SERVO CONTROLLER THE
OPERATOR MUST ACTIVATE (S01) ON THE SAFETY PLC. THIS IS DONE BY
PRESSING THE RESET/START BUTTON. IF THE SAFETY PLC IS SATISFIED IT
WILL ENABLE THE MCR RELAY ALLOWING THE JAW DRIVE SERVO
CONTROLLER ENABLE TO REACH THE CONTROLLER. (S01) ALSO
ACTIVATES A SET OF MOTOR CONTACTORS THAT MECHANICALLY
BREAK THE MOTOR CABLE FROM THE CONTROLLER POWER SOURCE
TO SATISFY THE SAFETY PLC THE FRONT AND BACK DOOR (9500)
SENSORS MUST BE MADE. THE PLC SEND A CHECK TO ENSURE THAT
THE FRONT AND BACK SENSORS, AND THE MCR RELAY HAVE NOT
BEEN ELCTRICALLY BYPASSED. WHEN THE RESET/START BUTTON IS
PRESSED, IF ALL IS SATISFIED ON THE SAFETY PLC, THE MACHINE WILL BE
ALLOWED TO RESET.
IN CLOSING, WHILE THE E-STOP BUTTOM IS PRESSED (S01 AND
S02) ON THE SAFETY PLC ARE BOTH IN A FAULTED STATE. THIS CAUSES
BOTH THE FILM DRIVE AND JAW DRIVE SERVO CONTROLLERS TO LOSE
THEIR ENABLE CIRCUIT THAT PASSES THROUGH THE SAFETY PLC,
MECHANICALLY BREAKING THE MOTOR FROM THEIR POWER SOURCE
AND DISABLES THE MCR, EXAUSTING OUT ALL AIR.