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Sigma_CP_Australian Interface Module.doc
Page 8 of 9
7
Operation
7.1
Normal condition
Under normal conditions, ancillary boards will have only the green, OK LED lit.
7.2
ACF – Ancillary Control Facility
7.2.1
Outputs
The ACF has a 24V DC monitored output suitable for operating a remote, polarised and suppressed
relay. Monitoring is via an end of line resistor. This output is designated ACF O/P +/-
A clean contact relay rated at 30VDC 1Amp follows the monitored output.
The ACF outputs are activated by a non-silenceable fire signal from the Sigma control panel
section. A red LED indicator is lit when the output is active.
A fault on the ACF outputs is signalled at the Sigma panels as a
General
fault and on the AIM as
ACF
fault.
7.2.2
Configuration:
The ACF can be configured as latching by setting the
LATCH
dipswitch to the ON position.
The ACF can be configured as failsafe (Normally Energised) by setting the
FAIL S.
dipswitch
to the ON position.
7.2.3
Controls – only available at Access Level 2
When the ACF is set to “latching” the
Reset
switch on the AIM module, in order to reset the ACF,
firstly, the Alarm must be reset, and then the ACF can be reset using the ACF Reset switch on the
AIM module.
When the ACF is set to “non-latching”, the ACF output is deactivated when the alarm is reset or
disabled.
The
Isolate
switch on the AIM module allows the ACF output to be disabled and not operate on an
alarm condition. A yellow
ACF Isolated
LED indicates when the ACF is isolated, and signals a
General Disablement to the Sigma control panel section.
7.3
Door Holder Output
The door holder circuit allows magnetic fire doors to be automatically closed in the event of a fire,
thus limiting smoke and fire egress in an emergency situation.
Four terminals are provided:
DH 24V In
A 24V supply to power the magnetic door holders.
Door Holders
The 24V from the “DH 24V In” circuit appears at this output under
“Normal” condition. When an alarm occurs, power is disconnected from the “Door Holder” output.
The maximum output of the Door Holder circuit must be less than 1A.
The status of the door holder output follows that of the ACF output as described in section 7.1 and
is isolated via the ACF Isolate facility. The only exception is when the
DOOR D.
dipswitch is ON,
the Door Holder Output activates after a 30 seconds delay.