GE DBF, Instructions Manual

Page: 19 / 65

2. OPERATION LOGIC
12 DBF Breaker Failure Protection GEK-106168E
2.4. CONTROL
2.4.1 TABLES OF SETTINGS
The DBF system has two types of settings stored in non-volatile memory (information is kept even when there is
no auxiliary voltage):
•
Generic Settings.
•
Specific Settings.
The
Generic settings are grouped as follows:
GENERAL SETTINGS
BREAKER SETTINGS
ACTIVE TABLE SETTINGS
OSCILLOGRAPHY MASK
FUNCTION PERMISSION
For the
specific settings, the DBF allows to have up to 3 independent setting tables. These specific settings are
grouped as follows:
50BF SETTINGS
INTERNAL ARC SETTINGS
Only one setting table is active at a given time, and this is the table used by the system to run the different
functions included in it.
There is an "ACTIVE TABLE" setting that determines the settings table that is active at a given moment.
The active settings table can be changed by means of up to 2 digital inputs, referred to as "ACTIVE TABLE
SELECT 0" and "ACTIVE TABLE SELECT 1" which allow up to 4 combinations from 0 to 3. To do this it is
necessary to configure (using GE-INTRO software) two inputs to have these meanings. For applications which
require less tables (up to 2) it is possible to use only one input.
The selected combination is obtained from the binary coding of the 2 inputs mentioned (see following table). The
0-0 means selecting the table indicated in the "ACTIVE TABLE" setting, and numbers 0-1 to 1-1 select tables 1 to
3 respectively
Table Selection
INPUT-1
Table Selection
INPUT-0
Active Table
0 0 Selected by setting
0 1 1
1 0 2
1 1 3
NOTE: if the inputs are programmed and used, energizing them, this selection has priority over the "ACTIVE
TABLE" setting and the table which is in fact used is determined by the status of the digital inputs.