LINK Systems System 2500 PLS - Manual (Page 45)

System 2500 Operating & Installation Manual - Revision 07 2-37
2.8.4.4 AUTO SS ON/OFF
When this choice is made, the information which was present on the Auto SS status and access
code screen will be redisplayed on the left side of this screen. On the right side will be the menu
for turning Auto Single Stroke 'ON' or 'OFF'. In order for the Automatic Single Stroke option to
be functional, the operator MUST turn Auto SS 'ON' in this screen. This is done by using the
arrow keys to move the cursor to the 'ON' label, then pressing the ENTER key. The status label
for AUTO SS will then display the 'ON' status.
The Automatic Single Stroke function reserves PLS outputs 7 and 8 for its own use, turning them
on and off as conditions require. Because of this, there can be no setpoints programmed on either
of these output channels (see Section 2.4.1). Output channels 7 and 8 cannot be Restricted (see
Section 2.5.5). In addition, neither of these channels can be tied to the counted outputs counter
(Section 2.4.3) and neither can be used as the special fault output for Cyclic mode of die
protection (Section 2.9.2). If any of these conditions are present on PLS output channels 7 or 8, a
warning message will be displayed and the Auto Single Stroke function cannot be turned 'ON'.
The Auto SS ON/OFF status is fixed regardless of the setup being used. That is, once Auto SS is
turned 'ON', output channels 7 and 8 will remain reserved regardless of the setup that is recalled
from backup memory. This means that if a setup is recalled that has on/off setpoints
programmed for output channels 7 or 8, an error will occur.
Use of the Auto Single Stroke function requires that at least one of the die protection inputs be
programmed to some mode other than static mode (see Section 2.8.4.1 above). If the die
protection is not programmed in this way an error will be generated when the Auto Single Stroke
is turned on.
If Automatic Single Stroke is not to be used, it should be turned 'OFF' in this screen.
2.8.4.5 MIN DELAY TIME
Selection of this menu item from the Auto SS Menu allows the operator to set the minimum time
between strokes for automatic single stroke mode. During automatic operation, at the
completion of each press stroke the system will generate a delay before the next stroke is
initiated, regardless of the status of the die protection inputs. This feature is useful when using a
brake monitor (stop time monitor) that will not allow a new stroke to be initiated during the
brake timing interval. For example, a press can stop within 300 ms, but the brake monitor is set
for 400 ms. If there were no Auto Single Stroke minimum delay time and the die protection was
satisfied during the brake timing interval of 400 ms, then the System 2500 would immediately
initiate a new stroke, causing a fault. However, if the Auto SS minimum delay time is set to 500
ms the System 2500 will wait until after the brake timing interval to initiate the stroke, and thus
avoid causing a fault.