9328900990 Rev L BE1-951 Protection and Control 4-37
Figure 4-30. BESTlogic Function Element Screen, Phase (27P)
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. A custom logic
scheme must
be created and selected in the Logic pull-down menu at the top of the screen before
BESTlogic settings can be changed. See Section 7, BESTlogic Programmable Logic.
Enable the element by selecting its mode of operation from the M
ode 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. For more details on the BESTlogic Expression Builder,
see Section 7, BESTlogic Programmable Logic. Select Done when the settings have been completely
edited.
Table 4-21 summarizes the BESTlogic settings for Phase Undervoltage/Overvoltage.
Table 4-21. Undervoltage and Overvoltage Logic Settings
Function Range/Purpose Default
0 = Disabled
1 =
Undervoltage (27) or overvoltage (59) on one (or more) phases causes
pickup.
2 =
Undervoltage (27) or overvoltage (59) on two (or more) phases causes
pickup.
Mode
3 = Undervoltage or overvoltage on all three phases causes pickup.
1
BLK Logic expression that disables function when TRUE. 0
Example 1. Make the following BESTlogic settings to the 27P element. Refer to
Figure 4-30.
Mode: All 3 of 3 Phases
BLK: IN4 + VO6
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