Rockwell Automation 1771-PM , D17716.5.18 U MNL 1771-PM CLUTCH/BRAKE MOD - Manual (Page 38)

PC Ladder Programming
Chapter 4
4Ć15
You should now be familiar with required and optional PLC ladder
programming needed to configure and monitor your clutch/brake
controller. Complete your ladder diagram programming addresses after
you have wired your press system as described in chapter 6. Clutch/brake
controller functions (Table 4.B) are summarized on the next page.
Table 4.B
Summary of Clutch/Brake Controller Functions
Function or Command Operating Mode Description
Ć Off Clutch/brake controller locks out press motion
Ć Inch The operator can jog the press through a complete cycle by
pressing and releasing the pair of INCH buttons. If INCH
buttons are held, the press will stop at the top of its stroke.
Ć MicroĆinch This mode of operation lets you run your press at low speeds
(1 to 5spm) for setting up dies and making trial runs. You must
supply a separate drive and clutch/brake assembly to drive the
shaft with full tonnage capacity at low press speeds, byĆpassing
the flywheel.
Ć SingleĆstroke
[ 1 ]
The press completes one cycle and then stops on top, provided
the operator holds both RUN buttons until completion of the
down stroke.
Ć Continuous
[ 1 ]
Operators must assert the ARM CONTINUOUS switch and all
station RUN buttons within five seconds, and then hold the RUN
buttons for half a stroke (or 1 1/2 strokes) if so configured to
start the press in continuous mode. Thereafter, the press runs
until stopped by a stopĆonĆtop command, or when a fault is
detected.
StopĆonĆtop
(cycle stop)
Continuous This command, from a switch wired to the clutch/brake
controller or from the PLC, stops the press at a predetermined
point.
OnĆtheĆhop SingleĆstroke Releasing and pressing both RUN buttons during a specific
portion of the upstroke causes the press to continue running
onto the next stroke without stopping. This is a configurable
option.
HalfĆstroke or
StrokeĆandĆaĆhalf
Continuous The operator must press both RUN buttons for 1/2 or 1 1/2
press cycles before the press can run on its own. This is a
configurable option. Run buttons must be held until RunĆon
(takeĆover) Cams are made.
[ 1 ] Cam limit switches must indicate that the press is in the nearĆtop position before motion can start in
single or continuous mode.
Summary of Clutch/Brake
Controller Functions