Element Blocking - Siemens 7SR12 Argus Manual

50BF Setting (xIn) Test Current
(110%).............
(90%)...............
50BF CB Faulty
50BF-I4 Setting Test Current
(xIn)
(110%).............
(90%)...............
50BF CB Faulty
If the circuit breaker can also receive a trip signal from a protection function where there is no increase in current,
this trip input should be mapped to 50BF Mech Trip in the INPUT CONFIG>INPUT MATRIX menu.
Initiate this binary input and simulate the circuit breaker remaining closed by ensuring the CB Closed binary Input
is energised and ensure operation of the 50BF-1 and 50BF-2 outputs after their programmed delays.
50BF Mech Trip
CB Closed
CB Open
3.1.1

Element Blocking

The CB Fail function can be blocked by Binary Input Inhibit. This functionality should be checked.
©2017 Siemens Protection Devices Limited
50BF-1 Delay...............
No Operation
Operation No Delay □
50BF-1 Delay...............
No Operation
Operation No Delay □
50BF-1 Delay...............
No Operation
Element
50BF
7SR11 & 7SR12 Commissioning and Maintenance Guide
50BF-2 Delay...................
□ No Operation
Operation No Delay □
50BF-2 Delay...................
□ No Operation
Operation No Delay □
50BF-2 Delay...................
□ No Operation
□
□
□
BI Inhibits
Chapter 6 Page 61 of 72