Siemens siprotec 7SA522 User Manual page 463

Changing Setting
Groups with Binary
Inputs
Trip Circuit Super-
vision
7SA522 Manual
C53000-G1176-C119-2
If binary inputs are used to switch setting groups, note:
• Two binary inputs must be dedicated to the purpose of changing setting groups
when four groups are to be switched. One binary input must be set for
"!6HW *URXS %LW", the other input for "!6HW *URXS %LW". If either of these
input functions is not assigned, then it is considered as not controlled.
• To control two setting groups, one binary input set for "!6HW *URXS %LW" is suf-
ficient since the binary input "!6HW *URXS %LW", which is not assigned, is con-
sidered to be not controlled.
• The status of the signals controlling the binary inputs to activate a particular setting
group must remain constant as long as that particular group is to remain active.
Table 8-1 shows the relationship between "!6HW *URXS %LW",
"!6HW *URXS %LW", and the setting groups A to D. Principal connection diagrams
for the two binary inputs are illustrated in Figure 8-5. The figure illustrates an example
in which both Set Group Bits 0 and 1 are configured to be controlled (actuated) when
the associated binary input is energized (high).
Table 8-1 Setting group selection with binary inputs — example
Binary Input Events
!6HW *URXS %LW  !6HW *URXS %LW 
no
yes
no
yes
no = not energized
yes = energized
Selector switch for
setting group
A
B
V+
C
D
A
B
V+
C
D
Figure 8-5 Connection diagram (example) for setting group switching with binary inputs
It must be noted that two binary inputs or one binary input and one bypass resistor R
must be connected in series. The pick-up threshold of the binary inputs must therefore
be substantially below half the rated control DC voltage.
Installation and Commissioning
Active Group
no Group A
no Group B
yes Group C
yes Group D
Binary input set for:
3Tr‡ÃB…‚ˆƒÃ7v‡Ã
"
Binary input set for:
3Tr‡ÃB…‚ˆƒÃ7v‡Ã
"
V–
&Ã
", High
V–
'Ã
", High
8-7