Doc #: L-2600-1023 Page 48 Rev. 02
3.4.5 Limit Switch Speed Advance Settings Screen
When the channel is in “Normal”, “Timed Off”, or
“Toggle” mode, it can be Speed Advanced.
Press inside the blue bordered speed advance area
(see “c” in Figure 33) and the speed advance setting
screen of Figure 36 will be shown.
Speed advance allows the limit switch output to
adjust its turn on and turn off points based on the
speed of the press and the mechanical reaction time
of what the limit switch is controlling. The result of
this is that things like pilot releases can be made to
actually release at the same point over a range of
press speeds.
For instance, if a feed pilot release takes 85 milliseconds to actually mechanically release the material,
then the “Lead Time” would be set to 85 milliseconds. In our example the “On Angle” for the limit
switch channel is set to 160 degrees (the point where the release is supposed to occur). At 60 SPM the
crank will travel about 31 degrees in 85 milliseconds and so the angle at which the system will actually
turn the limit switch on will be 129 degrees (160-31). This will result in the material being mechanically
released at 160 degrees, as intended. At 150 SPM the crank will travel about 77 degrees in 85
milliseconds and the system will actually turn the limit switch on at 83 degrees (160-77). Again, this
will result in the material being mechanically released at 160 degrees, as intended.
The feed pilot release may take 80 milliseconds to “regrip” the material and so that is set as the trail
time. The system will adjust the “Off Angle” based on this time in a similar manner as described above
so that the mechanical action will occur at the intended angle.
The end result is that the process can be run at a higher speed than would otherwise be attainable.
3.4.5.1 Speed Advance
“Speed Advance” can be “Not Used”, “Leading Edge”, “Trailing Edge” or “Both Edges”.
3.4.5.2 Lead Time
The “Lead Time” is the mechanical reaction time when the limit switch turns on.
3.4.5.3 Trail Time
The trail time is the mechanical reaction time when the limit switch turns off.
359
TOP
Stroke Speed
0
SPM
ACC
Espanol
Exit
Limit
Switch
Speed
Advance
PLS Channel 2
Lead
Time
15 ms
Both Edges
Trail
Time
10 ms
Mode:
Production
Figure 36: Limit Switch Speed Advance Screen
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