Man-1112 Sigma XT+_23 Page 19 of 52
9. Connection to monitored inputs
Monitored inputs (Mode select, manual release, Hold, Abort, Released pressure switch and Low pressure switch)
have the same characteristics as detection zone inputs and require a 6K8 0.5W end of line monitoring resistor and
a nominal, 470 ohm 1 W trigger resistor.
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 or Metron.
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 28 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 upsetting the operation of the control panel.
Only polarised solenoids (i.e. solenoids fitted with an internal polarising diode) should be used.
+
-
DIODE 1N 4004
BAND END TO +
Example of wiring a solenoid
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