Sigma CP and Sigma XT+ control
panels – Additional features added
As part of our policy of continuous
product improvement, the Sigma CP has undergone
a hardware and firmware revision.
The hardware revision is transparent
to the user, but involves a significant revision
to the power supply – in particular to the
battery monitoring circuit.
The internal impedance of the batteries and the
connecting leads is now monitored, to ensure that
there is not an unexpected volt drop from the
batteries when a load current is drawn from the
Earlier battery monitoring techniques only measure
the battery voltage under no load, and therefore
would not report a fault for high impedance in
This improvement to the battery monitoring ensures
robust and reliable panel operation is assured
when running the panel from the batteries and
will notify the user if there is a significant
degradation to the batteries. However local codes
of practice regarding the servicing of the fire
system and the battery manufacturers guidelines
regarding the useful life of the batteries should
continue to be adhered to.
In addition to the hardware
revision, two additional facilities have been
included in the panel firmware:
Point Fire indication –
it is now possible to configure the panel to distinguish
call point fire events from detection device fire
events. For this facility to be enabled configuration
menu Option 28 needs to be selected AND the call
point devices need to be configured to apply a
270-ohm resistance to the detection circuit.
When the call point is operated, the Zone Fire
indicator will flash and “Pu” will
be shown in the 7-segment display.
When a detection device is operated the Zone Fire
indicator will be illuminated with a steady indication
and there is no additional indication in the panel
Resound operation – when
there is a fire condition on a zone, then the
panel sounders are silenced, by default the sounders
will re-activate automatically from a fire event
from a different zone.
When configuration Option 29 is selected, the
previously silenced sounders will not re-sound
for any additional fire events from other zones.
These operational revisions
also will apply to the Sigma XT+ series control
panels, which use the Sigma CP as the fire detection
The revised power supply operation
will only apply to Sigma XT+ single area and two
area variants at present.
If updating or replacing the older Sigma CP /
Sigma XT+ hardware with this new version, there
is a possibility that the original batteries may
generate a fault and may need to be replaced as
result of this new battery impedance monitoring
Download Sigma CP Manual:
Sigma XT+ Manual: