LINK Systems System 2500 PLS - Manual (Page 26)

System 2500 Operating & Installation Manual - Revision 07 2-18
To remove a PLS channel from the list the operator must press the REMOVE key, then move the
cursor to the channel number desired using the arrow keys. The CLEAR key must then be
pressed to remove the restriction from the chosen channel.
2.5.6 OFFSET
The offset is a value that the System 2500 PLS will add to its resolver reading to make up for the
difference between machine zero position and resolver zero position. The offset value is limited
to + or - 10 degrees. If an offset of greater than + or - 10 degrees is necessary, mechanical
adjustments to the coupling of the resolver to the machine must be made. To adjust the offset the
operator is required to place the machine at its zero position (this position is usually top dead
center). The operator will be instructed to press the CLEAR key and then the '0' key. The
System 2500 PLS will calculate and display the necessary offset. If the offset is out of range, the
System 2500 PLS will retain the previous offset value.
2.5.7 PLS OUTPUT SPEED ADVANCE
In many applications it will be advantageous to have the on/off setpoints of a PLS channel to
advance (occur earlier in the stroke) as the speed increases. For example, an air blowoff for parts
may need to actuate earlier in the stroke as the machine speed increases. In order for setpoints
which are advanced in this way to operate properly, the PLS Output Speed Advance
configuration data must be programmed. The two data values required are the setpoint angle
which activates the desired output properly at minimum machine speed and the setpoint angle
which activates the output properly at maximum speed. This information must be determined
beforehand by the operator using the procedure to be described, and then entered in the PLS
Output Speed Advance selection of the Configure Menu (labeled OUTPUT ADVAN). If no PLS
outputs are to be programmed as Advanced, it is not necessary to program the PLS Output Speed
Advance data.
For example, if the operator wishes to speed advance the 'On' setpoint of a PLS output, he must
first run the machine at maximum speed and adjust the 'On' setpoint of that output until the
desired action occurs at the proper point in the stroke. This adjustment can be made by stopping
the machine and editing the setpoint (see Section 2.4.1.3) or by using the Increment feature to
change the setpoint (see Section 2.4.1.6). Once the correct setpoint for maximum speed has been
found and recorded, repeat the test for minimum speed. Then leave the setpoint at the minimum
speed setting but edit the setpoint to be an Advanced setpoint (see Section 2.4.1.5). The operator
can now go to the PLS Output Speed Advance selection of the Configuration Menu to enter the
two recorded setpoint angles.
Choosing OUTPUT ADVAN from the Configure Menu gives the operator access to two data
screens on which the setpoints found for minimum and maximum press speed can be entered.