Sigma
XT Firmware - New Features
As a result of customer feedback and as part
of our policy of continuous improvement, the
Sigma XT control panel firmware has been updated
to provide the following new features.
This revised firmware will be fitted to all
Sigma XT panels manufactured from December 2007.
Extract Output
The extract output on the Sigma XT could previously
only be operated after the release sequence
had been completed. When activated, the output
would only operate for three minutes and then
automatically timeout.
The mode of operation of the extract output
has now been modified, so that it can be selected
at any time and will remain
operated until either toggled off or the panel
is reset.
The "Ac" user menu facility has
been moved to the end of the user menu list.
On earlier versions of the Sigma XT, this
menu option is the first to be displayed as
soon as the enable control key is selected.
Infinite extinguishing duration
The Sigma XT extinguishing output may be configured
for a selectable duration between 60 seconds
and 300 seconds in five-second steps. In some
exceptional cases, it is desirable to have
the output permanently operated, rather than
switch off after the defined duration.
A new configuration option (menu selection
‘2b’) has been added, which when
selected sets the extinguishing output duration
to infinity. The output will switch off only
when the panel is reset.
NOTE: The panel does not conform to the requirements
of EN12094 part 1 when this configuration
option is selected,
Low-pressure Switch input
Switching a 470-ohm resistance across the
circuit activates the fully monitored low-pressure
switch input. This input therefore relies
upon normally open contacts at the low-pressure
switch.
Many low-pressure switches use normally closed
contacts, which open on low-pressure signal.
This causes problems when trying to connect
to the Sigma XT control panel input.
A new configuration option (menu selection
‘2C’) has been added. When this
configuration option is selected, the low-pressure
switch input is inverted, thus accommodating
normally closed contacts.
‘Manual Release’ and
‘Released’ input monitoring
If either of these inputs are active when
the panel is reset, then following the reset
the panel will redisplay that the appropriate
input is operated.
Earlier firmware version panels did not reinstate
the activated condition.
Detection circuit thresholds optimisation
Small adjustments have been made to the detection
circuit current thresholds for use with intrinsically
safe barriers. These adjustments ensure reliable
operation with wider ranges of I.S. barrier
electrical parameters.
Fire detection system - Reset function
The fire detection element of the Sigma XT
control panel can now be reset at any time.
This accommodates the scenario whereby a
zone has been disabled and a detector on the
zone has gone to a fire condition. It is now
possible to reset the detection device (by
removing power from the zone) before enabling
the detection zone.
The Sigma XT firmware now allows the reset
function to work in the quiescent condition,
rather than just in a fire condition.
Compatibility
These new features are supported on panels
with SIGXT_12 (Version 1.2) or later firmware.
This new firmware Sigma XT control panel
is compatible with any sigma SI status indication
units.
For systems fitted with older Sigma XT ancillary
relay boards, there is the small compatibility
issue. When the extract output is operated
on the Sigma XT panel, this output is not
operated on the ancillary relay board. All
other ancillary relay board Outputs operate
as expected.
Sigma XT Ancillary Relay boards fitted with
XTREM_12 (Version 1.2) or later firmware will
fully support these features.
Download the Sigma
XT manual:
Download the
Sigma XT ancillary board manual:
Download the
Sigma Si status units manual:
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Sigma XT
