Siemens siprotec 7SA522, User Manual

Page: 463 / 628

Installation and Commissioning
8-7
7SA522 Manual
C53000-G1176-C119-2
Changing Setting
Groups with Binary
Inputs 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).
no = not energized
yes = energized
Figure 8-5 Connection diagram (example) for setting group switching with binary inputs
Trip Circuit Super-
vision 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.
Table 8-1 Setting group selection with binary inputs — example
Binary Input Events
Active Group
!6HW*URXS%LW !6HW*URXS%LW
no no Group A
yes no Group B
no yes Group C
yes yes Group D
A
B
C
D
V–
V+
Selector switch for
setting group
Binary input set for:
“
!6HW*URXS%LW
”, High
A
B
C
D
V–
V+
Binary input set for:
”
!6HW*URXS%LW
”, High