LINK Systems System 2500 PLS - Manual (Page 24)

System 2500 Operating & Installation Manual - Revision 07 2-16
2.5.4 TOPSTOP SPEED ADVANCE
For variable speed machines the operator may program the stopping angle to advance (occur
earlier in the stroke) as the speed increases. For functions which result in a top stop this will
insure that the machine will continue to stop on top as the machine speed increases. In order for
a speed advanced stopping angle to operate properly, the Topstop Speed Advance configuration
data must be programmed (found under the TOPSTP ADVAN selection of the Configuration
Menu). The data values required are the minimum press speed and the stopping angle of the
machine at four different machine speeds. (The stopping angle is the crankshaft angle where a
stop signal must be given in order for the machine to stop at the top of the stroke). This
information must be determined beforehand by the operator using the procedure to be described,
and then entered in the TOPSTP ADVAN selection of the Configure Menu. If the stopping angle
is not to be speed advanced, the operator may skip programming of the Topstop Speed Advance
data.
The stopping angles for the machine can be found using the Topstop function of the Configure
Menu (see Section 2.5.3 for instructions on using Topstop). The System 2500 performs the top
stop function by opening the E-Stop relay at the proper point in the stroke to top stop the press.
By adjusting the angle entered in the TOPSTOP data screen, the machine can be made to stop on
top at the particular press speed chosen. For determining the speed advance constants, the
machine must be run at four different speeds and the correct angle for initiating a top stop must
be found for each speed and then recorded. The four speeds are:
1. Minimum machine speed.
2. Minimum speed plus one-third of the difference between maximum speed and
minimum speed.
3. Minimum speed plus two-thirds of the difference between maximum speed and
minimum speed.
4. Maximum machine speed.
Once the correct angles for initiating a stop at these four speeds have been recorded, the operator
can return to the TOPSTP ADVAN selection of the Configuration Menu to enter the angles.
Choosing TOPSTP ADVAN from the Configure Menu gives the operator access to several data
screens on which the minimum press speed and stopping angles can be entered. The operator can
use the cursor to select a data value, then key in the proper value and press ENTER. When a
'down arrow' symbol is displayed as the last character on the bottom line of the display, this
indicates that another data line is available to the operator by pressing the down arrow key while
the cursor is on the bottom line. In the same way, an 'up arrow' symbol displayed as the last
character on the top line indicates that another data line is available by pressing the up arrow key