LINK Systems System 2500 PLS - Manual (Page 38)

System 2500 Operating & Installation Manual - Revision 07 2-30
Figure 6
Die Protection Lock - Switch Wiring
BYPASS’ indicator on the OIT will flash to alert the operator. In order to change the status from
ON to OFF and vice versa, the keyswitch must first be in the PROGRAM position. (When in the
RUN position, a message is displayed on the right side of the screen and no changes are
allowed.) The upper right portion of the screen will then display a message directing the operator
to press the YES key to bypass the die protection (as seen in Figure 5.) If the die protection is
already off (bypassed), the message will read “Press YES to turn on” and the operator may press
the YES key to return the system to normal monitoring.
The exception to the above is if the Die Protection Lock feature has been enabled and is active;
in this case the upper right portion of the display will read ‘DIE-PROT LOCKED ON’ as shown
in Figure 7 and described in Section 2.8.2.2.
2.8.2.2 Die Protection Lock Status
The bottom line of the Die-Protection On/Off screen displays information regarding the ‘Die
Protection Lock’ feature. This feature provides for the option of using an external switch to force
the unit out of bypass; that is, force it to monitor the die protection inputs for fault conditions.
When the switch is in the lockout position, the operator cannot turn die protection OFF as
described in Section 2.8.2.1.
In order to use the lock feature, an external switch must be wired between Die Protection Input
#32 and ground, as shown in Figure 6. Once the lock feature is activated as described below, the
switch must be closed (input grounded)
and the keyswitch placed in PROGRAM
position in order for the operator to be
allowed to bypass die protection using the
OIT. Conversely, the lock will be on (die
protection forced active) when the switch
is open, that is, when the connection to
ground is broken. (Note that if no switch
is wired to the input after the lock feature
is activated, the operator will be prevented
from bypassing the die protection.)
A good application for using an external
switch to control bypass is when it is
desired that the system allow die
protection bypassing only in certain machine modes. For example, it may be desired that die
protection always be active when the machine is in Continuous mode. In this instance, input #32
on the System 2500 would be wired to ground through contacts on the machine Mode Selector
Switch. The contacts should be open in Continuous mode (forcing die protection to be active)
and closed in all other modes, allowing die protection to be bypassed if desired.