Function Description - ABB Relion Technical Manual

1MRK 502 048-UUS A
14.3
14.3.1
14.3.2
14.3.3
14.3.3.1
Technical manual

Function description

Function description
Limit counter
Limit counter L4UFCNT
Introduction
Limit counter (L4UFCNT) provides a settable counter with four independent limits where
the number of positive and/or negative flanks on the input signal are counted against the
setting values for limits. The output for each limit is activated when the counted value
reaches that limit.
Principle of operation
Limit counter (L4UFCNT) counts the number of positive and/or negative flanks on the
binary input signal depending on the function settings. L4UFCNT also checks if the
accumulated value is equal or greater than any of its four settable limits. The four limit
outputs will be activated relatively on reach of each limit and remain activated until the
reset of the function. Moreover, the content of L4UFCNT is stored in flash memory and
will not be lost at an auxiliary power interruption.
Design
Figure 248 illustrates the general logic diagram of the function.
IEC 61850 IEC 60617
identification identification
L4UFCNT
Section 14
Monitoring
ANSI/IEEE C37.2
device number
-
541