9328900990 Rev L BE1-951 Protection and Control 4-51
Figure 4-42. 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 4-30 summarizes the BESTlogic settings for Breaker Failure.
Table 4-30. BESTlogic Settings for Breaker Failure
Function 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
Example 1. Make the following BESTlogic settings to the Breaker Failure element. Refer to
Figure 4-42.
Mode: Enable
Initiate: IN4
Block: 0
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