Basler Electric BE1-851 - Manual (Page 77)

An alarm variable is provided in the programmable alarms function that can be used to indicate an alarm
condition when the breaker failure protection trips. See Section 6, Reporting and Alarms, Alarms
Function, for more details on the alarm reporting function.
BESTlogic™ Settings for Breaker Failure Protection
BESTlogic settings are made from the BESTlogic Function Element screen in BESTCOMS. Figure 4-19
illustrates the BESTCOMS screen used to select BESTlogic settings for the breaker failure element. To
open the BESTlogic Function Element screen for Breaker Failure, select Breaker Failure from the
Screens pull-down menu. Then select the BESTlogic button. Alternately, settings may be made using the
SL-BF ASCII command.
Figure 4-19. BESTlogic Function Element Screen, Breaker Failure
At the top center of the BESTlogic Function Element screen is a pull-down menu labeled Logic. This
menu allows viewing of the BESTlogic settings for each preprogrammed logic scheme. User or custom
logic must be selected on this menu in order to allow changes to the mode and inputs of the
function/element.
Enable the setting group control function by selecting its mode of operation from the Mode pull-down
menu. To connect the elements inputs, select the button for the corresponding input in the BESTlogic
Function Element screen. The BESTlogic Expression Builder screen will open. Select the expression type
to be used. Then, select the BESTlogic variable or series of variables to be connected to the input. Select
Save when finished to return to the BESTlogic Function Element screen. These settings will enable the
function block by attaching it to one of the CT input circuits and provide initiate and blocking control as
determined by the logic expressions assigned to those inputs. For details on the BESTlogic Expression
Builder, see Section 7, BESTlogic Programmable Logic. Select Done when the settings have been
completely edited.
Table 4-11 summarizes the BESTlogic settings for Breaker Failure Protection.
Table 4-11. BESTlogic Settings for Breaker Failure Protection
Setting Range/Purpose Default
Mode 0 = Disabled, 1 = Enabled 0
Initiate Logic expression that enables function when TRUE. 0
Block Logic expression that disables function when TRUE. 0
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