Close Circuit Supervision Connections - Siemens 7SR105 Rho User Manual

Scheme 3 (Comprehensive)
+
R
R
Scheme 3 provides full Trip supervision with the circuit breaker Open or Closed.
4.6.2

Close Circuit Supervision Connections

+
R
Close circuit supervision with the circuit breaker Open or Closed.
NOTE:
To achieve higher isolation, in the dual TCS application, it is recommended to maintain one Binary Input channel
should not be connected between 110 V DC and 230 V AC control supply.
NOTE:
Use the correct threshold voltages for BI when using TCS with 2 BI.
NOTE:
It is recommended to use Resistor (R), when the low voltage BI is used in the high voltage application. For e.g:
BI44 is used 220 V DC application.
With use of Resistor(R) mentioned above, BI threshold will increase due to voltage drop across external resistor.
©2018 Siemens Protection Devices
BO
TRIP CCT n FAIL
BI
+ve -ve
BI
+ve -ve
BO 1 BO n
Remote
Alarm
Figure 4-5 Trip Circuit Supervision Scheme 3 (H7)
BO
CLOSE CCT n FAIL
BI
+ve -ve
BO 1 BO n
Remote
Alarm
Figure 4-6 Close Circuit Supervision Scheme
7SR105 Rho and 7SR17 Rho Applications Guide
52a
TRIP COIL
Circuit
Breaker
52b
H7 Scheme Notes:
BI = 44V (110, 220V AC/DC supply)
R = 3K3 typical
52a
CLOSE
COIL
Circuit
R
Breaker
52b
H5 Scheme Notes:
BI = 44V (110, 220V AC/DC supply)
R = 3K3 typical
Chapter 7 Page 26 of 31
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