U.4.18
SEL-421 Relay User’s Guide Date Code 20090715
Basic Relay Operations
Making Simple Settings Changes
Step 4. Set the date format:
The SEL-421 reports dates in three formats: MDY, YMD, and
DMY (where M = month, D = date, and Y = year).
a. For this procedure type YMD <Enter>.
At each setting in turn, the relay presents the settings
prompt, name, present value, and action prompt.
Note that SEL
OGIC control equation settings, such as
FAULT in Figure 4.12, appear on multiple lines.
b. If you make a mistake or want to go backward through
the settings, type the ^ character (on most computer
keyboards, this is a shifted numeral 6) and <Enter>.
Refer to Table 4.6 for this and other navigational aids.
Step 5. End the settings session.
a. Type END <Enter> at the FAULT action prompt.
(The FAULT SEL
OGIC control equation remains
unchanged.)
The relay next scrolls a readback of all the Global
settings, eventually displaying the following prompt:
Save settings (Y,N) ? prompt
(In Figure 4.12, a vertical ellipsis represents the relay
information during readback.)
b. Examine the settings readback to verify your new
settings.
c. Answer Y <Enter> to save your new settings.
The TERSE Option
You can avoid viewing the entire class settings summary the relay displays
when you type END <Enter> midway through a settings class or instance.
On slow data speed links, waiting for the complete settings readback can clog
your automation control system or take too much of your time for a few
settings changes. Eliminate the settings readback by appending TERSE to the
SET command.
Text-Edit Mode Line Editing
Some SEL-421 settings present multiple input lines to your terminal; you use
basic line text editing commands to construct the setting. For display, the relay
references each line of the setting by line number, not by the setting name. See
Making Text-Edit Mode Settings Changes on page U.4.19 for an example of a
text-edit mode setting.
While in the text-edit mode, you see a prompt consisting of the line number
and the present setting for that line. You can keep the setting, enter a new
setting, or delete the setting. Table 4.7 lists the commands for text-edit mode.
Courtesy of NationalSwitchgear.com
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