Basler BE1-951 User Manual

4-14 BE1-951 Protection and Control 9328900990 Rev L
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 4-4 summarizes the BESTlogic settings for the Phase, Neutral, and Negative-Sequence elements.
Table 4-4. BESTlogic Settings for Instantaneous Overcurrent
Function Range/Purpose Default
Mode
0 = Disabled
1 = Enabled (x50TP and x50TQ)
1 = 3-phase input neutral (x50TN only)
G = Ground input (x50TN only)
1
BLK Logic expression that disables function when TRUE. 0
Example 1. Make the following settings to the 50TN element. Refer to
Figure 4-13.
Mode: 3 Phase Residual
BLK: 0
Operating Settings for Instantaneous Overcurrent
Operating settings for the 50T functions consist of Pickup and Time delay values. The Pickup value
determines the level of current required for the element to start timing toward a trip. Time delays can be
set in milliseconds, seconds, or cycles. The default is milliseconds if no unit of measure is specified.
Minimum timing resolution is to the nearest one-quarter cycle. A time delay setting of zero makes the
element instantaneous with no intentional time delay.
Operating settings are made using BESTCOMS.
Figure 4-13 illustrates the BESTCOMS screen used to
select operational settings for the 50T elements. To open the screen, select Overcurrent Protection from
the S
creens pull-down menu. Then select the 50T tab. Alternately, settings may be made using S<g>-50T
ASCII command or through HMI Screens 5.x.6.1 - 5.x.6.6 where x equals 1 for Setting Group 0, 2 for
Setting Group 1, 3 for Setting Group 2, and 4 for Setting Group 3.
NOTE
If the BE1-951 has 5 ampere phase inputs and a 1 ampere independent ground
input, the valid pickup setting range of the neutral overcurrent functions will
depend on the logic mode setting which designates whether the three-phase
residual or the independent ground input is to be monitored. If changing logic
schemes or settings causes a neutral overcurrent setting to be OUT OF RANGE,
the out of range setting will be forced in-range by multiplying or dividing the
current setting by 5.

Basler BE1-951 Specifications

General

Brand	Basler
Model	BE1-951
Category	Surge Protector
Language	English