Siemens 7SR105 Rho - Close Circuit Supervision Connections

7SR105 Rho and 7SR17 Rho Applications Guide
©2018 Siemens Protection Devices Chapter 7 Page 26 of 31
Scheme 3 (Comprehensive)
BI
+ve -ve
BO
BI
+ve -ve
TRIP COIL
52a
52b
-
Circuit
Breaker
TRIP CCT n FAIL
BO 1 BO n
Remote
Alarm
+
R
R
H7 Scheme Notes:
BI = 44V (110, 220V AC/DC supply)
R = 3K3 typical
Figure 4-5 Trip Circuit Supervision Scheme 3 (H7)
Scheme 3 provides full Trip supervision with the circuit breaker Open or Closed.
4.6.2 Close Circuit Supervision Connections
R
BI
+ve -ve
+
BO 1 BO n
Remote
Alarm
BO
R
CLOSE
COIL
52a
52b
-
Circuit
Breaker
H5 Scheme Notes:
BI = 44V (110, 220V AC/DC supply)
R = 3K3 typical
CLOSE CCT n FAIL
Figure 4-6 Close Circuit Supervision Scheme
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.