Siemens SIPROTEC 7UT613 series Manual page 342

3 Mounting and Commissioning
Trip Circuit Super-
vision
342
The control signals must be continuously present in order that the selected setting
group remains active.
The following table shows the relationship between binary inputs and the setting
groups A to D. Principal connection diagrams for the two binary inputs are illustrated
in the figure below. The figure illustrates an example in which Set Group Bit 1 and Set
Group Bit 2 are configured to be controlled (actuated) when the associated binary
input is energized (high).
Table 3-1 Changing setting groups with binary inputs
Binary Input
>Set Group Bit 1 >Set Group Bit 2
no no
yes no
no yes
yes yes
1)
no = not activated
2)
yes = activated
Figure 3-1 Connection diagram for setting group switching with binary inputs (example)
Please note that two binary inputs or one binary input and one bypass resistor R must
be connected in series. The pickup threshold of the binary inputs must therefore be
substantially below half the rated control DC voltage.
If two binary inputs are used for the trip circuit supervision, these binary inputs must
be isolated, i.o.w. not be communed with each other or with another binary input.
If one binary input is used, a bypass resistor R must be employed. This resistor R is
connected in series with the second circuit breaker auxiliary contact (Aux2). The value
of this resistor must be such that in the circuit breaker open condition (therefore Aux1
is open and Aux2 is closed) the circuit breaker trip coil (TC) is no longer picked up and
binary input (BI1) is still picked up if the command relay contact is open.
Active Group
Group A
Group B
Group C
Group D
7UT613/63x Manual
C53000-G1176-C160-2