Section 3: Supervision Functions; Cb Fail (50Bf) - Siemens 7SR242 Duobias Technical Manual

Section 3: Supervision Functions

3.1

CB Fail (50BF)

Voltage Inputs:
Current Inputs:
Disable:
Map Pickup LED:
The circuit breaker fail protection time delays are initiated either from:
A binary output mapped as Trip Contact in the OUTPUT CONFIG>BINARY OUTPUT CONFIG menu,
or
A binary input mapped as 50BF Ext Trip in the INPUT CONFIG>INPUT MATRIX menu.
Or
A binary input mapped as 50BF Mech Trip in the INPUT CONFIG>INPUT MATRIX menu.
These elements are operated from W1 and W2 current inputs, ensure that current is injected on the correct input
for the element being tested.
©2015 Siemens Protection Devices Limited
Chapter 6) 7SR242 Duobias Commissioning & Maintenance Guide
Figure 3-1 CB Fail
n/a
W1-I (I ), W1-I (I ), W1-I
L1 A L2 B
50BF-n-n - Self Reset
(I ), I or W2-I (I ), W2-I
L3 C G1 L1 A
(I ), W2-I (I ), I
L2 B L3 C G2
Chapter 6 Page 51 of 62