Sel 751A, Instruction Manual

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7.33
Date Code 20100129 Instruction Manual SEL-751A Relay
Communications
SEL ASCII Protocol and Commands
OPEN Command (Open Breaker)
The OPE (OPEN) command asserts Relay Word bit OC for 1/4 cycle when it
is executed. Relay Word bit OC can then be programmed into the TR
SEL
OGIC
control equation to assert the TRIP Relay Word bit, which in turn
asserts an output contact (e.g., OUT103 = TRIP) to open a circuit breaker (see
Table 4.25 and Figure 4.29 for factory default setting TR and trip logic).
To issue the OPE command, enter the following.
=>>
OPE <Enter>
Open Breaker (Y,N)?
Y <Enter>
=>>
Typing N <Enter> after the above prompt will abort the command.
The OPE command is supervised by the main board Breaker jumper (see
Table 2.13 ). If the Breaker jumper is not in place (Breaker jumper = OFF), the
relay does not execute the OPE command and responds with the following.
=>>
OPE <Enter>
Command Aborted: No BRKR Jumper
=>>
PASSWORD Command (Change Passwords)
Use the PAS command (see Table 7.31 and Table 7.32 ) to change existing
passwords.
The factory default passwords are as shown in Table 7.33 .
To change the password for Access Level 1 to #Ot3579!ijd7, enter the
following command sequence:
=>>
PAS 1 <Enter>
Old PW: ?
***** <Enter>
New PW: ?
*********** <Enter>
Confirm PW: ?
*********** <Enter>
Password Changed
=>>
Similarly, use PAS 2 to change Level 2 passwords.
Table 7.31 PASSWORD Command
Command Description Access Level
PAS level Change password for Access Level level . 2
Table 7.32 PAS Command Format
Parameter Description
level Parameter level represents the relay Access Levels 1 or 2.
Table 7.33 Factory Default Passwords for Access Levels 1 and 2
Access Level Factory Default Password
1 OTTER
2 TAIL
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