Sel 421 - Page 158

U.4.20
SEL-421 Relay User’s Guide Date Code 20090715
Basic Relay Operations
Making Simple Settings Changes
Step 2. Access the display point settings.
a. Type SET F <Enter> to modify the front-panel
settings.
b. Advance through the front-panel settings (repeatedly
type > and then <Enter>) until you reach the Display
Points and Aliases category.
Figure 4.13 shows a representative terminal screen. The
relay displays the first line that you can edit. For the
case of display points, the line number is the display
point number.
Step 3. At the Line 1 settings
? prompt, type the following to create
Display Point 1:
IN101,CB1,CLOSED,OPEN <Enter>
The relay verifies that this is a valid entry, then responds with
the next line prompt
2: followed by the settings ? prompt (see
Figure 4.14).
Step 4. At the Line 2 settings
? prompt, type the following to create
Display Point 2:
IN102,CB2,CLOSED,OPEN <Enter>
The relay verifies that this is a valid entry, then responds with
the next line prompt
3: followed by the settings ? prompt (see
Figure 4.14).
Step 5. At the Display Points and Aliases prompt, use the text-edit
mode line editing commands to list the active display points.
Type the following:
LIST <Enter>.
After showing the active display points, the relay returns to
line
3: followed by the settings ? prompt.
Step 6. Type the following to create Display Point 3:
IN105,“5 MVA XFMR Fans”,ON,OFF <Enter>
The relay verifies that this is a valid entry, then responds with
the next line prompt
4: followed by the settings ? prompt (see
Figure 4.13).
Step 7. Type END <Enter> to end the editing session.
The relay scrolls a readback of all the Front-Panel settings,
eventually displaying the
Save settings (Y,N) ? prompt. (A
vertical ellipsis in Figure 4.13 represents the readback.)
At the end of the readback information, just before the
Save
settings (Y,N) ?
prompt, you can verify the new display
point information.
Step 8. Answer Y <Enter> to save the new settings.
NOTE: Use quotation marks when
entering alias strings that contain
spaces or punctuation marks, as
shown in the IN105 example, Step 6.
Courtesy of NationalSwitchgear.com