LINK Systems OmniLink II Press Automation Control - Manual (Page 73)

August 30, 2002 Manual Version 1.0 4.24
It is IMPORTANT TO NOTE that the OmniLink II cannot provide Auto Top Stop Compensation for
top stop signals that it does not initiate to the press clutch/brake control in automatic modes. Top stop
signals from auxiliary equipment or top stop operator controls that are wired directly to the clutch/brake
control cannot be compensated. Exception! If the anti-repeat cams used for single stroke are also the
cams used to provide top stop in automatic modes, the PLS outputs used to auto top stop compensate the
anti-repeat function in single stroke will also compensate top stop signals from auxiliary equipment and
top stop operator controls in automatic modes. If approved by Link engineers, Link Systems SS501
controls with at least 4 mechanical cam switches available for use with the anti-repeat function may be
augmented with PLS outputs from the OmniLink II Press Automation Control to provide auto top stop
compensation from all top stop sources.
Section 4.2.3.2.2 Calibration Procedure for Variable Speed Presses
The suggested auto top stop calibration procedure for variable speed presses is as follows.
1. Go to the Speed Adjusted Top Stop Compensation screen. Turn the Run/Program Switch to
Program. Enter a setting equal to the lowest strokes/min for the variable speed press for the Low
Speed SPM. Enter a setting equal to the highest strokes/min for the variable speed press for the High
Speed SPM. Enter settings of 0
0 for both the Low Speed Degrees Before Top Dead Center and High
Speed Degrees Before Top Dead Center. With both Low Speed and High Speed Degrees Before
Top Dead Center set to the same value, the press control will not calculate a stopping angle based on
speed but will use the programmed setting (0
0
) to generate a stop signal at all speeds.
2. Turn the Run/Program switch to Run, select the Continuous mode of operation on the press control,
and set the speed of the press to the value entered for Low Speed SPM. If your system has the
optional analog input/output card and it is set up to control stroking speed, press the Motor Speed
Softkey in the lower left corner of the operator terminal and enter a speed setting equal to Low
Speed SPM. If not, use the speed pot or other speed setting device for your variable speed drive to
adjust stroking speed to the value entered for Low Speed SPM. Initiate Continuous stroking. After a
few strokes, press the TOP STOP softkey on the Speed Adjusted Top Stop screen (do not top stop
the press using any top stop button that may be provided with the press control). Since both Low
Speed and High Speed Degrees Before Top Dead Center were set to 0 in step 1, the OmniLink
operator terminal will initiate a stop signal at Top Dead Center (0
0 ), and the press will travel into the
downstroke before stopping. Look at the operator terminal angle display in the upper left corner of
the display to read the angle at which the press slide comes to a stop. Since the stop angles (Low
and High Speed Degrees before Top Dead Center) entered in step 1 were both 0, the reading on the
angle display is the number of degrees the press took to stop.
3. Turn the Run/Program switch back to Program. Enter the number shown on the Operator Terminal
angle display into both the Low Speed and High Speed Degrees Before Top Dead Center as an
approximate setting.
4. Return the Run/Program switch back to Run and initiate Continuous stroking again. Press the Top
Stop softkey on the Speed Adjusted Top Stop screen after a few strokes, read the measured SPM
displayed by the Speed At Stop Initiation on the Operator Terminal display and compare this number
to the number you entered for Low Speed SPM. It is normal for speed to vary slightly throughout a
stroke, and the measured SPM at the point the stop was initiated may be a few strokes/min different
than the value set for Low Speed SPM. If so, change the number for Low Speed SPM to be the
same as the measured Speed At Stop Initiation value.