FUNCTION CHARACTERISTICS
35
NA016 - Manual - 05 - 2022
Circuit breaker supervision
Preface
By means 52a and 52b auxiliary contacts, the CB position is acquired. Depending on such information
the Open and/or Close commands can be safely issued by user.
The wrong congruity of the auxiliary contact is detected in run time mode (52a and 52b), by means of
two binary inputs; any failure is detect and stored inside the 100 events (Data Logger).
Operation and settings
52a is the auxiliary contact in the breaker that is in the same position as the breaker (52a open = CB
open). It must be assigned to the IN2 binary input.
52b is the auxiliary contact in the breaker that is in the opposite position as the breaker (52b open =
CB closed)). It must be assigned to the IN1 binary input.
Fun-CB-position.ai
TRIPPING MATRIX
(LED)
52a ON/OFF
t
mask
0T
t
mask
CB monitoring
52b ON/OFF
52a
52
52b
+UAUX
-UAUX
IN2
IN1
=1
Logic diagram concerning the Circuit Breaker monitoring
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