ERL L-PRO 4000, User Manual

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6 Offliner Settings Software
6-26 L-PRO 4000 User Manual D02706R02.30
and set a pickup and dropout delay. Start with input A by selecting any of the
relay functions using the list for up to 5 possible inputs. Put these inputs into
AND, NAND, OR, NOR, XOR, NXOR and LATCH logics by clicking on the
gate. Invert the input by clicking on the input line.
The output of ProLogic 1 can be nested into ProLogic 2 and so forth. If de-
scribed, the user can illuminate the front target LED on operation of this func-
tion by enabling this feature. The operation of the ProLogic statements are
recorded in the events logs.
The above is an example of a ProLogic application where an output is
produced if either of the line breakers is slow to open following a line
fault.
In this example current through the main and aux line breaker is present
as measured by the 50LS Main and the 50LS Aux functions after a
protection line trip as by Output Contact 14 and after the 0.50 ms (3
cycles) ProLogic 1 pickup time delay.
Group Logic
The 16 Group Logic statements reside in a slower processing thread within the
relay protection algorithms. The processing cycle happens once every half sec-
ond (0.5 s). When using ProLogic statements the user must keep in mind that
a latch or dropout timer should be used if the initiating condition does not last
at least 0.5 seconds.