Schweitzer Engineering Laboratories SEL-787, Instruction Manual, Page: 325 / 564

8.7
Date Code 20081022 Instruction Manual SEL-787 Relay
Front-Panel Operations
Human-Machine Interface
Assume the math variables are not enabled. In response to a request for math
variable data (selecting
Math Variables
), the device displays the message as
shown in Figure 8.10 .
Figure 8.10 Relay Response When No Math Variables Enabled
Events Menu
Select the
Events
menu item from the
MAIN
menu as shown in Figure 8.11 .
EVENTS
menu has
Display
and
Clear
as menu items. Select
Display
to view
events and
Clear
to delete all the events data.
Figure 8.11 MAIN Menu and EVENTS Submenu
Figure 8.12 shows the
DISPLAY
menu when
Display
is selected from the
EVENTS
menu with events in the order of occurrence starting with the most
recent. You can select an event from the
DISPLAY
menu and navigate through
the event data.
Figure 8.12 EVENTS Menu and DISPLAY Submenu
When
Display
is selected and no event data are available, the relay displays as
shown in Figure 8.13 .
Figure 8.13 Relay Response When No Event Data Available
When
Clear
is selected from the
EVENTS
menu and confirming the selection,
the relay displays as shown in Figure 8.14 after clearing the events data.
Figure 8.14 Relay Response When Events Are Cleared
No Math
Variables
Enabled (see EMV
Setting)
MAIN
Meter
Events
Targets
Control
Set/Show
Status
EVENTS
Display
Clear
(Events Selected)
DISPLAY
03/25/2007 11:56:51.158
03/25/2007 11:54:31.158
.
.
EVENTS
Display
Clear
(Display Selected)
No Data
Available
Clearing
Complete