Product Manuals/Man-1088_Sigma XT_26 Page 18 of 40
11. Connection to remote control terminals
Some functions of the control panel can be controlled externally from the panel if required. The
external equipment operating inputs must be restricted by an access level 2 control as defined
in EN54-2 The functions are abbreviated at the terminals block as follows:
a) Remote 0 V supply – ROV
b) Silence Alarm – SIL (Silences sounder outputs S1 &S2 only)
c) Sound Alarm – AL (Operates sounder outputs S1 & S2 and not S3)
d) Fault – FLT (Generates a general fault and operates the fault relay)
e) Reset – RST (Resets the system back to normal condition)
To activate these inputs, the remote 0 Volt (R0V) supply must be connected to the input via a
normally open switch or contact and via a resistance of no greater than 100 ohms.
All of the remote control inputs are non-latching.
12. 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 C25.
The supply is fitted with an electronic, self resetting fuse rated at 0.5 Amps 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.
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 device to prevent
the generation of high voltage transients back to the control panel power supply.
