Schweitzer Engineering Laboratories SEL-421-4, Instruction Manual

Page: 922 / 1518

4.26
SEL-400 Series Relays Instruction Manual Date Code 20171006
Front-Panel Operations
Front-Panel Menus and Screens
Figure 4.29 shows an example of entering the SEL-451 setting CTRW (Terminal
W CT ratio) from the front panel. At the
MAIN MENU
, select the
SET/SHOW
item and
press
ENT
. The LCD screen displays the
SET/SHOW
screen as shown in
Figure 4.29 . You can use the navigation pushbuttons to select the relay settings
class (
PORT
,
GROUP
, and
GLOBAL
) or to change the
ACTIVE GROUP
or the
DATE/
TIME
. For this example, select the
GROUP
class.
Next, select the particular instance of the settings class. For the
PORT
settings
class, the instances are
PORT 1
,
PORT 2
,
PORT 3
,
PORT F
, and
PORT 5
. For the
GROUP
class, the instances are the numbered groups from 1 through 6 and M, the
breaker monitor (see the
GROUP
screen in Figure 4.29 ). The class
GLOBAL
, the set-
ting
ACTIVE GROUP = n
(where n is a number from 1 to 6), and the settings for
DATE/TIME
have no settings instance screens. In the
GROUP
screen, move the high-
light box to 3 and press ENT .
Proceed to selecting the settings category. The
GROUP
submenu in Figure 4.29 is
an example of settings Group 3 categories. Once you have highlighted the set-
tings category, pressing
ENT causes the relay to display the particular settings in
that category. The
LINE CONFIGURATION
screen in Figure 4.29 shows the settings
that you can set in the line configuration settings category.
To edit or examine a setting, use the
Up Arrow
and
Down Arrow
pushbuttons to
highlight that setting, then press ENT . The relay displays a settings entry screen
with the existing setting value (see the
SET CTRW
screen in Figure 4.29 ). If the
prompt for the selected setting does not fit on the line, the relay scrolls the setting
prompt across the screen.
Enter the setting name using a method similar to the method described in Relay
Elements (Relay Word Bits) on page 4.19 . Place characters in the element name
field (with the block cursor) using the navigation pushbuttons.
If the data you entered are valid (within settings range checks), the front-panel
display returns to the settings category screen that shows each setting and corre-
sponding present value (see the
LINE CONFIGURATION
screen of Figure 4.29 ). If
the data you entered are invalid, the relay displays an error message screen, then
returns to the particular settings entry screen so you can attempt a valid settings
entry (see the
CTRW
screen of Figure 4.29 ).
When finished entering the new settings data, press ESC . The relay prompts you
with a
Save Settings
screen. Using the navigation pushbuttons, answer
YES
to
make the settings change(s), or
NO
to abort the settings change(s).
ACTIVE GROUP Active settings group number 1–6
DATE/TIME Date and time settings
Table 4.9 Settings Available From the Front Panel (Sheet 2 of 2)
Class/Setting Description