Sel 551 - Table 5.7 SEL-551 Control Subcommands

5.23
Date Code 20110408 Instruction Manual SEL-551 Relay
Serial Port Communications and Commands
Command Explanations
See Remote Control Switches on page 3.7 for more information.
OPE Command (Open)
The OPE (Open) command asserts the TRIP Relay Word bit, which can be
programmed to an output contact to trip circuit breakers. See Figure 3.13.
To issue the OPE command, enter the following:
=>>OPE <Enter>
Open Breaker (Y/N) ? Y <Enter>
Are you sure (Y/N) ? Y <Enter>
=>>
Typing N <Enter> after either of the above prompts will abort the command.
The OPE command is supervised by main board jumper JMP24. If the jumper
is not in place (jumper JMP24 = off), the relay does not execute the OPE
command and responds:
Aborted: No Breaker Jumper
PAS Command (Password)
The factory default passwords for Access Levels 1 and 2 are:
The PAS (Password) command allows you to change existing Level 1, and 2
passwords at Access Level 2 and allows you to change the Level C password
from Level C. To change passwords, enter PAS x, where x is the access level
of the password being changed. The relay will prompt for the old password,
new password, and a confirmation of the new password.
To change the password for Access Level 1, enter the following:
=>>PAS 1 <Enter>
Old Password: *******
New Password: ********
Confirm New Password: ********
Password Changed
Similarly, PAS 2 can be used to change the Level 2 password.
Table 5.7 SEL-551 Control Subcommands
Subcommand Description
SRB n Set Remote Bit n (“ON” position)
CRB n Clear Remote Bit n (“OFF” position)
PRB n Pulse Remote Bit n for one processing interval
(1/8 cycle; “MOMENTARY” position)
NOTE: If the OPE command is
executed (and SEL
OGIC control
equation setting 79RI = TRIP + . . .),
the relay goes directly to the Lockout
State. [Early SEL-551 firmware
versions do not have this feature (see
Appendix A: Firmware and Manual
Versions). To effectively incorporate
this feature into these firmware
versions, set SEL
OGIC control equation
setting 79DTL = OC + . . . (and 79RI =
TRIP + . . .). Relay Word bit OC asserts
to logical 1 for 1/8 cycle when the OPE
command is executed (see Table 4 .5
and Ta ble 4 .6 ). See Figure 3.15 and
Table 3 .5 and accompanying text in
Section 3: Relay Elements and Logic.]
Access Level Factory Default Password
1 OTTER
2TAIL
CCLARKE
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