Noby-448 Installation & Programming Instructions (Rev.5) Page 4 of 12
INPUTS
Zone Detector Circuits
The Noby-448 requires that each detector zone is terminated with a 4k7 End Of Line resistor. This EOL resistor is
necessary to facilitate open circuit, short circuit and head removal monitoring. The total current drawn by the
detectors on each circuit must not exceed 2mA, which means that 20 detectors can be connected to each zone
(based on a typical 100uA maximum per detector). Similarly, if the detectors are specified at 50uA maximum
current draw, then 40 detectors per zone can be connected.
Class Change Input (Bell Ring)
A positive going input signal to switch on the sounders directly (subject to their isolation status).
The input is non-latching and no indication is given on the display.
Fault Input
A signal input from connected ancillary equipment eg. remote signalling equipment, which causes the Common
Fault LED to flash when activated. The polarity of the Fault_Input signal is programmable (software version 1-8
onwards). The factory setting is for a positive voltage-applied, which requires no external connection to hold off the
fault indication, which is preferrable if the input is not used. However, when connecting a fault signal fed back from
remote equipment it is recommended to use a voltage-removed signal for added safety. In this case the Noby-448
fault input polarity should be configured to be normally high, going low to initiate a fault condition. See Engineer
Keypad Functions.
OUTPUTS
Sounder Circuits
Conventional 4k7 End Of Line resistor monitoring requiring polarised bells or sounders with a combined output
current of 1.25A across the 4 sounder ports. The Noby-448XT 4-Zone Extender provides an additional 4 sounder
ports with a 1.25A combined output current.
Each sounder circuit is individually fused and monitored.
Fire Relay Output
Double pole voltage free contacts, 1A@30V, activated upon detection of a zone fire or by the keypad operated
Evacuate function. It is latched until a System Reset. The relay can be isolated - see User Keypad Functions /
Isolation. The Fire Relay Output is not triggered by the Bell Ring Input or from any activation of a zone that has
been programmed as a non-latching zone.
Panel Sounder (Piezo)
A piezo sounder is located at each Remote Keypad Unit to provide for local keypad ‘clicks’, fire and fault warning
tones. Fire tone = continuous rapid pips. Fault tone = 4 rapid pips every 4 secs.
There is an additional piezo sounder fitted to the main PCB to provide an audible fault warning in the unlikely event
of Remote Bus failure (damaged cable etc.).
Aux 12v
A 12v auxiliary supply fused at 1A (Fuse F1), monitored.
Aux 24v
A 27.3v (nominal 24v) auxiliary supply fused at 1A (Fuse F2), monitored.
Communication Port (JP1)
JP1/1 to JP1/8 (“Z1” to “Z8”) are positive going 12v/10mA signal outputs, latched on receipt of a fire alarm
condition, cleared upon System Reset. These signal outputs are sufficient to trigger remote signalling equipment,
or perhaps drive a mimic LED display.
JP1/9 (“Flt”) is a Fault Output ** and signals real-time status of System Faults from all sources. It is an open
collector PNP 12v/50mA, normally switched to 12v, switched off (released) if there is a standing fault.
JP1/10 (“0”) is 0 volts or system common ground.
** NOTE: The Fault Output signal is also made available on the screw terminal marked “FAULT”.
This applies to circuit board PC146-3 onwards (Revision 3).
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