U.4.9
Date Code 20090715 User’s Guide SEL-421 Relay
Basic Relay Operations
Changing the Default Passwords
If you are presently at Access Level 1, B, P, A, or O, typing 2AC <Enter>
causes the SEL-421 to prompt you to type the Access Level 2 password. If the
present level is Access Level 0, the SEL-421 responds with
Invalid Access
Level
. The relay asserts alarm Relay Word bit SALARM when entering
Access Level B, P, A, O, and 2 from a lower access level.
If you are unable to enter the correct password after the third failed attempt,
the SEL-421 asserts the BADPASS and SALARM Relay Word bits for one
second and displays on a communications terminal screen the following error
message:
WARNING: ACCESS BY UNAUTHORIZED PERSONS STRICTLY PROHIBITED
In addition, you cannot make further access level entry attempts for 30
seconds. The relay terminates the communications connection after the third
failed attempt when you use Ethernet via an Ethernet card, DNP3 (Distributed
Network Protocol Version 3.0), and M
IRRORED BITS
®
communications virtual
terminal mode. For more information on these protocols, see Section 5: SEL
Communications Protocols in the Reference Manual and Section 6: DNP3
Communications in the Reference Manual.
If your connection to the SEL-421 has an inactivity time-out (in the SET P
port settings), the SEL-421 automatically closes the communications
connection and changes to Access Level 0 when the time-out occurs.
Passwords
Valid passwords are character sequences of as many as twelve characters.
Valid password characters are any printable ASCII character. HMI password
entry is limited to upper- and lower-case letters, numbers, underscore, and
period, so you must limit your password to these characters if you need to do
privileged operations from the front panel. Passwords are case sensitive.
It is important that you change all of the passwords from their default values.
This will protect you from unauthorized access.
Use strong passwords. Strong passwords contain a mix of the valid password
characters in a combination that does not spell common words in any portion
of the password.
Changing the Default Passwords: Terminal
Step 1. Confirm that the relay is operating (see Connecting and
Applying Power on page U.4.3).
Step 2. Establish communication with the SEL-421 (see Making an
EIA-232 Serial Port Connection on page U.4.5 to learn how to
use a terminal to communicate with the relay).
Step 3. Enter Access Level C (level 2 is sufficient except when
changing the level C password).
a. Using a communications terminal, type ACC <Enter>.
b. Type the Access Level 1 password OTTER and press
<Enter>.
You will see the Access Level 1 => prompt.
c. Type 2AC <Enter>.
d. At the password prompt, type TAIL <Enter>.
e. Type CAL <Enter>.
f. At the password prompt, type Sel-1 <Enter>.
You will see the Access Level C ==>> prompt.
This device is shipped with default
passwords. Default passwords should
be changed to private passwords at
installation. Failure to change each
default password to a private
password may allow unauthorized
access. SEL shall not be responsible
for any damage resulting from
unauthorized access.
!
WARNING
NOTE: Passwords are case sensitive;
you must enter passwords exactly as
set.
Courtesy of NationalSwitchgear.com
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