P.10.8
SEL-411L Relay Protection Manual Date Code 20151029
Basic Relay Operations
Changing the Default Passwords
ACCESS Command
Enter the ACCESS (ACC) command to change to Access Level 1. Passwords
are case sensitive; you must enter a password exactly as set.
NOTE: You can shorten relay
commands to the first three letters of
the full command. See Section 15:
ASCII Command Reference for more
information.
If you enter the password correctly, the relay moves to Access Level 1 and the
Access Level 1 => prompt appears. If you are at a higher access level (B, P, A,
O, and 2), you can reduce the access level to Access Level 1 by entering the
ACC command. The relay performs no password validation to reduce the
present access level.
Higher Access Level Commands
Enter the commands in Table 10.3 to enter access levels above Access Level 1.
For example, enter the 2ACCESS (2AC) command to change to Access
Level 2.
If you are presently at Access Level 1, B, P, A, or O, typing 2AC <Enter>
causes the relay to prompt you to type the Access Level 2 password. If the
present level is Access Level 0, the relay 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 relay 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 2: SEL
Communications Protocols in the Communications Manual and Section 4:
DNP3 Communications in the Communications Manual.
If your connection to the relay has an inactivity time-out (in the SET P port
settings), the relay 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.
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.
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