Schweitzer Engineering Laboratories SEL-321 - Front-Panel Reset; Target Reset; Default Display; Target Command

Date Code 20011026 Communications 3-35
SEL-321/321-1 Instruction Manual
Command Buttons
See
Table Format Application
Minimum
Access
Level
QUI Return to Access Level 1
FAULT FAULT 3.16 FAULT View event history information 1
METER METER None METER View voltage and current inputs 1
STATUS STATUS 3.17 STATUS Display self-test status 1
GROUP GROUP 3.18 GROUP
GROUP
View group variable
Change group variable
1
B
Front-Panel Reset
If no buttons are pressed on the front panel, the relay waits a time period specified in the
FP_TIMEOUT setting and then takes the following actions:
• The front-panel LCD display resets to the default target display.
• The front-panel access level reverts to Access Level 1.
• The LCD back lighting is turned off.
• Any routine being executed via a front-panel command is interrupted.
• The target LEDs revert to the default targets.
FP_TIMEOUT is set to 5 minutes at the factory and can be set from 0 to 30 minutes using the
SET G command.
Target Reset
The left-most button is dedicated to the TARGET RESET function. Pressing TARGET RESET
causes the front-panel LEDs to illuminate for a one-second lamp test then all target LEDs are
cleared except for the LED labeled EN, which is illuminated. It clears trips (TPA, TPB, and TPC
elements) if the trip condition has gone away. It clears automatic diagnostic messages from the
front-panel LCD display.
Default Display
If no other display modes are selected, the first line of the LCD display shows the trip target
string and the second line contains fault information.
Target Command
Press the TARGET button to display contents of the target registers. Push the Up and Down
Arrow (↑ and ↓) buttons to change the target number and view the LEDs. Push the EXIT button
or CANCEL button to return to the default display. While the target command is selected, the
bottom row of LEDs and value in the LCD display follows the target values as they are updated,
thus allowing a monitor function of the targets. Table 3.15 shows a typical TARGET command
dialog. The last target row is 40 for a relay with one I/O board, and is 43 for a relay with two I/O
boards.