U.4.19
Date Code 20090715 User’s Guide SEL-421 Relay
Basic Relay Operations
Making Simple Settings Changes
Use commas to separate the items in a text-edit mode setting when you are
entering multiple items per line. After you enter each line, the relay checks the
validity of the setting. If the entered setting is invalid, the relay responds with
an error message and prompts you again for the setting.
Making Text-Edit Mode Settings Changes
The procedure in the following steps familiarizes you with basic text-edit
mode line editing. You set Display Point 1 through Display Point 3 to show
the status of Circuit Breaker 1, Circuit Breaker 2, and the operational state (on
or off) of the transformer cooling fans near the circuit breaker bay where you
have installed the SEL-421. See Display Points on page U.5.10 for
information on programming display points.
For this example, use inputs IN101, IN102, and IN105. You can use other
inputs for your particular application. See Control Inputs on page U.2.5 for
more information on control inputs.
This procedure assumes that you have successfully established
communication with the relay (see Making an EIA-232 Serial Port
Connection on page U.4.5) In addition, you must be familiar with relay access
levels and passwords (see Changing the Default Passwords: Terminal on
page U.4.9) to change the default access level passwords.
Step 1. Prepare to control the relay at Access Level 2.
a. Using a communications terminal, type ACC <Enter>.
b. Type the Access Level 1 password and press <Enter>.
You will see the Access Level 1 => prompt.
c. Type the 2AC <Enter> command.
d. Type the correct password to go to Access Level 2.
You will see the Access Level 2 =>> prompt.
Table 4.7 Actions at Text-Edit Mode Prompts
Action Relay Response
<Enter> Accept the setting and move to the next line; if at the last line
or at a blank line, exit settings.
>n <Enter> Move to line n. If this is beyond the end of the list, move to a
blank line following the last line.
^ <Enter> Move to the previous line; if at the first line, stay at the
present line.
< <Enter> Move to the first line.
> <Enter> Move to a blank line following the last line.
LIST <Enter> List all settings and return to the present action prompt.
DELETE [n] <Enter> Delete the present line and subsequent lines for a total of n
lines; n = 1 if not provided. Lines after deletion shift upward
by the number of lines deleted.
INSERT <Enter> Insert a blank line at the present location; the present line and
subsequent lines shift downward.
END <Enter> Go to the end of the present settings session. Prepare to exit
settings via the “Save settings (Y,N) ?” prompt.
<Ctrl+X> Abort editing session without saving changes.
Courtesy of NationalSwitchgear.com
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