Product Manuals/Man-1088_Sigma XT_26 Page 15 of 40
9. Connection to monitored inputs
Monitored inputs (Mode select, manual release, Hold, Released pressure switch and Low
pressure switch) have the same characteristics as detection zone inputs and require a 6K8 end of
line monitoring resistor and a nominal, 470 ohm trigger resistor.
Figure 10. Example of wiring to a monitored input
10. Connection to extinguishant output
The extinguishant output is capable of supplying up to 1 Amp for the maximum duration to a
solenoid or 3 Amps for 20 milliseconds to an igniting actuator.
The wiring for solenoids and igniting actuators is different as shown below. Igniting actuators of
different types or from different manufacturers should not be mixed on the same circuit.
10.1 Solenoid wiring
Solenoids must have a resistance of greater than 30 ohms to ensure that the maximum current
rating of the extinguishant output is not exceeded.
Solenoids should be fitted with a suppression diode to prevent EMF generated by the solenoid
when it de-energises from causing interference to the operation of the control panel. This diode
also acts as the end of line monitoring device.
Figure 11. Example of wiring a solenoid
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