ABB SACE Tmax XT2 - Page 72

1SDH002031A1002 ECN000092998 Rev. B SACE Tmax XT2 – XT4 | 72
D Zone selectivity
[2]
Characteristics
Ekip Touch has five selectivity links:
Name
Type
Description
Name for D
Szi
Input
Selectivity input in Forward direction
DFin
Szo
Output
Selectivity output in Forward direction
DFout
Gzi
Input
Selectivity input in Backward direction
Dbin
Gzo
Output
Selectivity output in Backward direction
Dbout
Szc
Municipality
Municipality of selectivity network
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
the same direction on the device immediately following (example: DFout).
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
Condition
DFin
Dbin
DFout
Dbout
Tripping
time
Comments
Forward
If < I7 Fw
0
x
0
x
No TRIP
The device is not in alarm
status
Backward
If < I7 Bw
x
0
x
0
Forward
If < I7 Fw
1
x
1
x
No TRIP
The device is not in alarm
status but transmits the
selectivity signal received on
the output of the reference
direction
Backward
If < I7 Bw
x
1
x
1
Forward
If > I7 Fw
0
x
1
x
t7 Fw sel
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
Backward
If > I7 Bw
x
0
x
1
t7 Bw sel
Forward
If > I7 Fw
1
x
1
x
t7 Fw
The device is in alarm status
but is not the first to detect the
fault: trips in the time t7 Fw (or
t7 Bw)
Backward
If > I7 Bw
x
1
x
1
t7 Bw
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).