ABB RED615 Technical Manual page 579

1YHT530004D05 D
615 series
Technical Manual
A051097 V4 EN
Figure 305: Operating principle of the trip-circuit supervision with an external
resistor. The TCSSCBR blocking switch is not required since the
external resistor is used.
If TCS is required only in a closed position, the external shunt resistance can be
omitted. When the circuit breaker is in the open position, TCS sees the situation as
a faulty circuit. One way to avoid TCS operation in this situation would be to block
the supervision function whenever the circuit breaker is open.
A051906 V2 EN
Figure 306: Operating principle of the trip-circuit supervision without an
external resistor. The circuit breaker open indication is set to block
TCSSCBR when the circuit breaker is open.
Section 6
Supervision functions
573