3.64
SEL-400 Series Relays Instruction Manual Date Code 20171006
Basic Relay Operations
Operating the Relay Inputs and Outputs
Step 6. Command the relay to pulse the control output.
a. Press the Up Arrow and Down Arrow navigation pushbuttons to
highlight
OUT104 as shown in Figure 3.56(c).
b. Press the Right Arrow navigation pushbutton to highlight
YES
under
PULSE OUTPUT?
c. Press the ENT pushbutton.
The relay detects your request for a function at an access level for
which you do not yet have authorization. Whenever this
condition occurs, the relay displays the password access screen
as shown in Figure 3.57.
Step 7. Input a password and pulse the output.
a. Enter a valid Access Level B, P, A, O, or 2 password.
(The front panel is always at Access Level 1, so you do not enter
the Access Level 1 password.)
Enter a valid password by using the navigation pushbuttons to
select, in sequence, the alphanumeric characters that correspond
to your password.
b. Press the ENT pushbutton at each password character.
(If you make a mistake, highlight the
BACKSPACE option and press
ENT to reenter a character or characters.)
c. After entering all password characters, press the Up Arrow or Down
Arrow pushbuttons to highlight
ACCEPT, and press ENT.
The relay pulses the output, and you will see the indicating
device turn on for a second and then turn off.
Controlling a Relay Control Output With a Local Bit in the Terminal
In this example, you set Local Bit 3 to start the transformer cooling fans near the
breaker bay where you have installed the SEL-451. Thus, you can use the LCD
screen and navigation pushbuttons to toggle relay Local Bit 3 to control the state
of the cooling fans. Relay Word bit LB_SP03 provides supervision for Local Bit 3.
Relay Word bit LB_SP03 must be asserted for successful Local Bit 3 operations.
For more information on local bits, see Local Control Bits on page 4.22.
The procedure in the following steps proposes connecting the transformer bank
fan control to relay output OUT105. You can choose any relay output that conforms
to your requirements.
This example assumes that you have successfully established communication
with the relay (see Making an EIA-232 Serial Port Connection on page 3.4). In
addition, you must be familiar with relay access levels and passwords (see
Changing the Default Passwords in the Terminal on page 3.10 to change the
default access level passwords).
Figure 3.57 Password Entry Screen
A B C D E F G H
I J K L M N O P
Q R S T U V W X
Y Z a b c d e f
g h i j k l m n
o p q r s t u v
w x y z 0 1 2 3
4 5 6 7 8 9 _ .
ACCEPT BACKSPACE
PASSWORD REQUIRED
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