LINK Systems OmniLink II Press Automation Control User Manual
Page 88
August 30, 2002 Manual Version 1.0
5.5
on where in the stroking cycle the fault occurs and how many degrees the press crankshaft will travel
after the stop is applied. Figure 5.3 illustrates the Intellistop function.
a. Intellistop at Lower SPM
b. Intellistop at Higher SPM
Figure 5,3 Illustration of Speed Advanced Intellistop Function
The terms used to describe various angles in Figure 5.3 and the way they may be determined are as
follows.
1. Critical Angle. The critical angle for a given die in a given press is the greatest downstroke angle
that can occur without upper die parts closing on material or lower die parts. The top of the press
stroke occurs at the 0
0
position of crank or eccentric shaft and the bottom at the180
0
position as
shown in Figure 5.3. The downstroke angle at which the upper die closes on material depends on the
die design. Draw Dies may close on material at a downstroke crank angle of as little as 100
0
, i.e.,
several inches above the bottom of the stroke. Blanking dies may not close on material till the
downstroke crank angle is 170
0
or more, i.e., only a fraction of an inch above bottom of stroke. Any
stop signal that results in stopping beyond the critical angle increases risk of sticking the press on
bottom. Any stop signal that causes the press to stop before the critical angle will keep the press
from sticking on bottom and reduce the risk of damaged die or press.
Determine critical angle for a set of dies with the dies in the press and adjusted to their proper
shutheight. Inch the press slide downward until just before dies close on material and then stop the
inching process. Actually, it is preferable to determine where the dies would close on a double
thickness or more of material, since a fault may result from a condition that could cause a double or
greater thickness of material in the die. Once you have inched the slide to the position described in
the preceding sentences, observe the angle display at the upper left of the operator terminal display.
Enter a critical angle setting equal to the angle indicated on the display.
2. Intellistop Angle. The Intellistop angle is the last angle at which a Cycle Stop signal may be given
to stop the press at or before the critical angle. The press crankshaft will turn through an angular arc
that represents angular stopping distance in degrees. The angular stopping distance depends on upper
die weight, counterbalance pressure (when the press has a counterbalance), brake and clutch wear,
and stroking speed if the press is a variable speed press.
INTELLISTOP
ANGLE
CRITICAL
ANGLE
0
0
180
0
TOP STOP
ANGLE
CRITICAL
ANGLE
INTELLISTOP
ANGLE
0
0
180
0
TOP STOP
ANGLE
BLACK ARC - CYCLE STOP
GRAY ARC - TOP STOP
BLACK ARC - CYCLE STOP
GRAY ARC - TOP STOP