LINK Systems System 2500 PLS - Manual (Page 22)

System 2500 Operating & Installation Manual - Revision 07 2-14
The motion detector is used as a check by the System 2500 PLS to insure that the resolver is
properly wired, the input circuits are functioning, and the resolver is coupled to the machine
crankshaft. The operator must enter three values into the motion detector configuration. These
values are:
C THRESHOLD - This is the crankshaft speed at which the System 2500 will
recognize that the machine is in motion. The speed entered here should be 75% of
the machine's slowest operating speed.
C CLUTCH TIME - This is the time required after the machine control gives the run
signal before crankshaft motion begins (i.e., clutch engagement time). The range
of values that can be entered is 2 to 998 milliseconds. This time should be set to
as small a value as possible.
C
MAX SPM - This the maximum machine speed in strokes per minute (SPM).
All data requested by the motion configuration must be entered for the unit to operate properly.
To enter or change any value move the cursor to the desired value, key in the new data and press
ENTER. The System 2500 will accept only even numbers for this data; entry of odd values will
be rounded up to the next even value. Note that if the value entered for MAX SPM is less than
the value entered for THRESHOLD, an error will be generated. To clear the error correct values
must first be entered and then the CLEAR key pressed. Additionally, an error will be generated
if the value entered for MAX SPM is less than the value entered for MINIMUM PRESS SPEED
in the Speed Advance data screen. In this case either the MAX SPM or MINIMUM PRESS
SPEED must be corrected to its proper value before pressing the CLEAR key.
The Motion Detector data is used in the following way: When the machine 'RUN' signal
becomes active (terminals 34 and 35) the System 2500 is alerted that the machine has been
commanded to stroke. The unit then expects machine motion (i.e., resolver motion) to occur
within the time limit programmed in CLUTCH TIME. Machine motion is recognized when the
machine crankshaft is turning faster than the speed programmed as THRESHOLD. If the System
2500 PLS does not detect motion at a speed greater than THRESHOLD within the time limit
programmed as CLUTCH TIME, it assumes that a fault has occurred and de-energizes the E-
Stop relay. The MAX SPM data entered is used in other resolver related checks and also in
calculating Speed Advance constants (see Sections 2.5.4 and 2.5.7).
2.5.3 TOPSTOP
Certain functions of the System 2500 can be programmed so that stop conditions will allow the
machine to stop at the top of its stroke rather than cause an immediate stop. The System 2500
accomplishes this by opening the E-Stop relay at the proper angle in the stroke so that the