Eaton SDR-WEXT, Installation Manual

Page: 7 / 12

Page 7
TF
The SDR-WEXT-G3 has a TF (Tamper
Feed) terminal, which should be used only
if a Tmp Feed link is not fitted. TF and TR
go open circuit on a tamper condition; the
normal state is open circuit.
PCB Jumper Details
SCB/SAB
In SAB (Self-Activating Bell)
mode, which is the typical
choice, the siren draws all its
power from the control
unit/expander. The internal
battery is used only if power
from the control unit/expander
is disconnected.
In SCB (Self-Contained Bell)
mode, all power to operate the
siren when in a non-alarm state
is drawn from the control
unit/expander. When in an
alarm state, the siren sources
power from its own internal
battery. Typically, SCB mode is
used if the control
unit/expander is not able to
provide sufficient power (e.g. if
multiple sirens are used).
Trig Mon
The SDR-WEXT-G3 has a Trig Mon
(Trigger Monitor) jumper. Fitting a link
allows the siren to monitor the BELL input
for tamper conditions (e,g, caused by the
wire being cut). If a BELL tamper condition
is detected, the sounder and TR output
activate.
The output at the control unit/expander
end of the cable requires a 4k7 pull-up
resistor (between the output and 12Vdc ).
This is provided by default if you are using
an open-collector transistor output from an
i-on, Menvier or Scantronic control
unit/expander (such as provided by the
BELL output). If a relay-type output is used,
you need to add the resistor yourself. If you
are using an open-collector output from
another type of control unit and want to
check for the presence of a 4k7 pull-up,
temporarily connect a separate 4k7 resistor
between the output and 0V; if a 4k7 resistor
is present, the voltage at the output should
be half of the supply voltage to the siren
(typically 6.9Vdc).
The jumper setting is read when power is
applied or the lid is opened.
Tone Slct
Fit a link across Tone Slct (Tone Select) or
leave it disconnected to choose one of two
tones from the sounder. You may want to
use this feature if, for example, you want to
be able to distinguish two sounders that are
in close proximity.
Time
The Time (Cut-Off Timer) jumper
configures the maximum length of time the
sounder operates following an alarm (even
if the BELL input is still active). Choose 5
seconds, 3 minutes or leave the link
disconnected for a default cut-off time of 15
minutes.
Note: To reactivate the sounder, the BELL
input must be taken to 12V for at least two
seconds before 0V is reapplied.
The jumper setting is read when power is
applied or the lid is opened.
LED En
Fit a link across LED En (LED Enable) to
enable the comfort LEDs. The jumper
setting is read when power is applied or the
lid is opened.
During normal operation, the comfort LEDs
flash alternately when the siren has power
connected to give a visual indication that
the system is operational.
When installer mode is activated, both
comfort LEDs switch on continuously for a
few minutes. The comfort LEDs also switch
on continuously during the silent startup
period between connecting the battery and
10 seconds after closing the lid.