Super Systems 9205 Series - Manual (Page 67)

Series 9205 Operations Manual Rev A 66
Types of Maintenance Items
The following types of maintenance items can be programmed: Timed Event, Conditional Timer,
Conditional Counter, and Totalizer.
•
Timed Event. A timed event is a maintenance event
that is based on intervals of time. For example,
assume a plant has burners that need to be inspected
once per week. The Timed Event can be programmed
to remind operators to perform this maintenance
check. In the example shown, a Timed Event called
“Burners” has been created. The Interval is Weekly,
and the number of Weeks for which the maintenance
item will remain active is 20. The message that will
appear on the main 9205 touch screen is “Check
condition of burners”.
• Conditional Timer. The conditional timer maintenance
event is based on the status of a selected controller
register over a defined period of time. For example, a
maintenance task may need to be performed when a
register value is above a certain threshold for 1 hour.
If the register value is above that threshold for 1 hour,
a maintenance message will be displayed on the main
9205 screen.
In the example shown, when the value for Register
25007 (Temperature PV) is greater (>) than 500.00
(than field) for 5 minutes (Target), a “Check Alloy”
message will be displayed on the main screen for the
9205 touch screen.
The Expression option allows you to program a scaled
value that will be compared to the value entered in
the than field. In the example shown at right, the
value of the register will be multiplied by 0.1 (scaled
to 10% of the original value) before it is compared to
the value in the than column.