Man-1078_Sigma_CP_AUS_12
Page 14 of 29
13
Aux 24V DC supply
An auxiliary 24V DC supply is provided to enable local signalling or control of ancillary systems such as door
release controllers. The terminals for the Aux 24V supply are labelled Aux 24V and ROV. The ROV terminal
is the negative terminal and is the same terminal that should be used to switch the remote control terminals.
It is possible to make the ROV terminal pulsing so that by connecting it to the AL terminal via a remote volt-
free contact, it can be used to pulse the dedicated sounder circuits in response to a signal from another
system for example to give an alert. See programming code 24.
The supply is fitted with an electronic self-resetting fuse to protect the control panel’s 24V supply in the
event of a wiring fault.
Any standing load on the Aux 24V supply must be taken into account when calculating battery standby times
as standby time will be significantly affected by even modest standing loads. It is recommended that the
Aux24V output is
not
used to power standing loads and not used to supply loads of greater than 300
milliamps.
Where the Aux 24V supply is used to power electromechanical devices such as relays or door retainers it is
imperative that a suppression diode is fitted across the coil of the electromechanical device to prevent the
generation of high voltage transients back to the control panels power supply. The Aux 24V DC Supply is not
suitable for powering Sigma CP sounder boards, a separate power supply should be used for these.
14
Connection to relay contacts
Volt free changeover relay contacts are provided for local control and signalling if required. These contacts
are rated for switching signalling circuits only and the maximum ratings listed in Table 1should not be
exceeded under any circumstances.
Fault relay
The
Fault Relay
is normally energised and will de-energise upon any fault condition including total loss of power.
Local fire relay
The
Local Fire Relay
will energise upon activation of a fire condition on any of the zones or pressing of the
Sound Alarm
Button on the front panel. The relay will remain activated until the alarm is silenced or the
panel is reset. This relay will not operate upon activation of the remote AL input or when a fire condition is
triggered on a zone that is in test mode.
Fire relay
The fire relay will energise upon activation of a fire condition on any of the zones. The relay will remain
activated until the control panel is reset. This relay will
NOT
operate upon activation of the remote AL input.
Individual zones can be configured not to operate the Fire relay by setting configuration options E1 to E8.
15
Connection to Accessory modules
Accessory modules include a Gas Module, Ancillary Relay Module, or an Australian Interface Module.
Accessory modules connect via a 2 core cable to the terminals marked RS485 + and – on the Sigma CP main
control panel PCB. Up to a total of 7 Accessory modules may be connected and each has terminals for the
incoming cables and outgoing cables. All except the last accessory module connected to the cable must
have the jumper links J2 removed.
The address of any accessory modules used within the system must have their address set using the DIP
switch on the module, ensuring that no two modules of the same type share the same address. NOTE: The
Australian Interface Module is fixed at Output unit address 7 and cannot be changed.
Apply power to main panel first and then all accessory modules. Turn ON the
Enable Control
keyswitch and
set the
Write Enable
switch to ON then briefly press the
Processor Reset
button on the main panel. Wait for
a few seconds and the main panel will show the addresses of the modules that were found on the display for
instance “r1” indicates that a module at address 1 has been found.
Turn the
Write Enable
switch OFF, then ON again and then press the
Enter
button to accept each module
that has been found. When all modules have been added, set the main panel
Write Enable
switch to OFF.
Press the
Watchdog Reset
switch on the main panel.
All modules are now configured and the main control panel will report a fault if any module, that has been
accepted, becomes faulty or goes off-line.
