CP – Two wire systems
Sigma CP panels are available in two hardware
• K11 series – A conventional “four-wire”
system available with 2, 4, or 8 detection zones. This panel has two conventional
sounder circuits and does not support sounders on the detection zones
T11 series – Also known as a “two-wire” system, which also is
available with 2, 4 or 8 detection zones. In addition to the two conventional
sounder circuits, there is the facility to connect sounders to the same two cables
used for the detection devices. The sounders are connected across these cables
in reverse polarity and the zone voltage is switched to operate the zone sounders.
Therefore these panels provide the option for a sounder circuit for each zone
in addition to the two conventional sounders.
The T11 series panels have
configuration options that allow the two-wire facility to be deselected. These
Option 25 – Enable Sounders on Detection Circuits
This configuration is selected by default on the T11 two-wire
panels. When selected, the detection zone voltage will reverse on appropriate
detection zones, ringing the zone sounders in accordance with the selected ringing
pattern (common / zonal or 2-stage).
When this is deselected, the T11 panel operation will be the same
as the K11 series panels.
NOTE: It is not possible to configure K11
series panels for two-wire operation by selecting menu option 25. The
T11 series panels incorporate additional hardware to support the zone sounder
facility, which is not included in the K11 series panels.
C1 to C8 – Enable Two wire operation by zone
These menu options
are used to configure Zone 1 through to Zone 8 (using C1 for Zone 1, C2 for Zone
2 etc) so that individual zones can be configured as conventional or as two-wire,
as required. These will only work on the T11 series panels and
configuration option 25 must also be selected.
ability to deselect a zone from two-wire operation is useful in applications where
zone voltage reversal is not supported by the detection devices, such as beam
units and aspirated detection devices.
The C1-C8 options are only available
on Sigma CP T11 series panels built from September 2006 with
firmware version 2.42 (or later) installed.
This firmware is identified by
a software label on the rear of the Sigma CP circuit board, which printed with
the Sigma CP manual: