EMT-7R Programmable Top Shaft Control
The PLC Control for the top shaft on the EMT-7R is a single program control that
utilizes intervals of air being introduced to the air over oil hydraulic system and wait
times between each burst of air. The control has two different operating modes and they
are explained as follows:
MANUAL:
In manual mode the top shaft is controlled by means of either pushing the
UP
or
DOWN
buttons on the keypad. Very few of the other buttons on the keypad will
function when in manual mode.
AUTOMATIC:
In automatic mode the manual up and down function buttons on the
keypad are not useable. After a program is entered and the home position is set then the
foot pedal is activated and must remain activated until the end of the program. If the foot
pedal is released before the end of the program then the top shaft will return to it home
position and will begin at the start of the program.
PROGRAMMING THE CONTROL:
Each part may vary and must be programmed
with this in mind. Some parts require a full revolution before the top shaft can be fed
down i.e. Spin-In Collar and ½” Flange Rolls. With this in mind you will need to vary
your speed of the rolls to match the settings on the control. This can only be done with a
little bit of trial and error. There are three different settings that make up a program and
they are as follows:
INDEX TIME:
This is the amount of time that air will be introduced to the system
thereby driving the top shaft down with each burst of air. The shorter the time the larger
the number of steps will be required to get to the bottom of the stroke.
NOTE:
There is
less than 1” of stroke required to get from the top of the stroke to the bottom. The
number should never have to be much longer than ½ a second for a simple part like a
bead of a fraction of a second for the spin collar rolls.
WAIT TIME:
This is the amount of time required between the bursts of air. This
number will be set according to the diameter of part and if the part requires a full
revolution or not before the next downward movement of the top shaft.
Summary of Contents for EMT-7R
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