ABB SACE Tmax XT2 User Manual page 72

D Zone selectivity Characteristics
[2] Ekip Touch has five selectivity links:
Name
Szi
Szo
Gzi
Gzo
Szc
Configuration
For a correct configuration of D selectivity in a ring system:
1. Connect the selectivity output of each device (example: DFin) to the selectivity input going
2. Connect all the Szcs of the devices of the same network to each other.
Logical table
The table shows all cases in which – with zone selectivity enabled on the device – there is an
alarm condition or a zone selectivity signal coming from another device.
If the direction of the malfunction is the same as the direction of reference (see page 58 for
details) then the Forward output is activated. If instead the direction is contrary, the Backward
output is activated.
Fault
direction
Forward
Backward
Forward
Backward
Forward
Backward
Forward
Backward
1SDH002031A1002 ECN000092998
Type Description
Input Selectivity input in Forward direction
Output Selectivity output in Forward direction
Input Selectivity input in Backward direction
Output Selectivity output in Backward direction
Municipality Municipality of selectivity network
the same direction on the device immediately following (example: DFout).
Condition DFin
If < I7 Fw 0
If < I7 Bw x
If < I7 Fw 1
If < I7 Bw x
If > I7 Fw 0
If > I7 Bw x
If > I7 Fw 1
If > I7 Bw x
NOTE: with zone selectivity activated, if the direction of the malfunction cannot be
determined the unit intervenes taking into consideration the lowest programmed time
between t7 Fw and t7 Bw, without activating any output (DFout or Dbout).
Rev. B
Tripping
Dbin DFout Dbout
time
x 0 x
No TRIP
0 x 0
x 1 x
No TRIP
1 x 1
x 1 x t7 Fw sel
0 x 1 t7 Bw sel
x 1 x t7 Fw
1 x 1 t7 Bw
Name for D
DFin
DFout
Dbin
Dbout
SZc
Comments
The device is not in alarm
status
The device is not in alarm
status but transmits the
selectivity signal received on
the output of the reference
direction
The device is in alarm status
and is the first to detect the
fault: trips in the time t7 Fw sel
or t7 Bw sel
The device is in alarm status
but is not the first to detect the
fault: trips in the time t7 Fw (or
t7 Bw)
SACE Tmax XT2 – XT4 | 72