ABB REC 561, User Manual

Page: 144 / 643

ABB Network Partner AB
- 9 Page
Function:
WARNING!
Do not set this function in operation before carefully reading these
instructions and configuring the MMI--BLOCKSET functional input
to the selected binary input.
The MMI--BLOCKSET functional input is configurable only to one
of the available binary inputs of a terminal. For this reason, the ter-
minal comes with the default configuration, where the MMI--
BLOCKSET signal is connected to NONE-NOSIGNAL.
1 Application
Setting values of different protection and control parameters and the con-
figuration of different function and logical circuits within the terminal are
important not only for reliable and secure operation of terminal, but also
for the entire power system.
Non-permitted and non-coordinated changes, made by unauthorized per-
sons, can cause severe damages in primary and secondary power circuits.
They can influence the security of people working in close vicinity of the
primary and secondary apparatuses and those using electric energy in eve-
ryday life.
For this reason, all REx 5xx terminals have built in a special feature that,
when activated, blocks the possibility to change the settings or configura-
tion of the terminal on the MMI unit.
All other functions of the local man-machine communication remain
intact. This means that the operator can read all disturbance reports and
other information and setting values for different protection parameters
and the configuration of different logical circuits.
This function permits remote changes of settings and configuration
through the built-in, serial communication ports, when the remote com-
munication option is installed in the terminal and if the setting restrictions,
which can be set only on the local MMI, permit remote changes of set-
tings.
4
Restricted settings via man-
machine interface 1MRK 580 163-XEN
Version 1.0-00
October 1996
Basic