Power supply unit, Input & detection circuits – Noby UK Noby-65 User Manual

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Noby-65 Installation Manual & Operating Instructions (Rev.1)

Page 3 of 12


The PSU provides a regulated voltage rail of 13.6v (nominal 12v), with a continuous current rating of 1.5A, and a
20-minute rating of 2.0A. The PSU is designed to meet the internal standby power requirements of the Noby-65
and also to charge and maintain the 7Ah SLA battery in optimum condition. The battery standby time is dependant
upon the overall system current drawn, including all connected equipment. Also it is strongly recommended that the
continuous system standby current does not exceed 1.0A, because some reserve PSU capacity must be available
to recharge the battery following an alarm condition or a prolonged period of 230VAC power loss.

The Noby-65 enclosure can accommodate one 12v/7Ah SLA battery.

The PSU is monitored for loss of 230VAC power, low battery voltage, and a Battery-Condition load test is
performed every 12hrs. PSU faults are indicated by a flashing Power LED and the Fault LED, together with an
audible pulsing fault tone at the Buzzer output.

Always ensure that the maximum current drawn in alarm does not exceed the 3.0A battery fuse limit (F3).

The PSU is monitored for:





i) 230VAC Absent or Fuse F2 blown:

Power LED is off. (after a 10s delay).

ii) 230VAC Restored:

Power LED flashes. (memory).

iii) Low Battery Voltage:

Power LED flashes.

Fault LED is lit when the voltage <10.0v

iv) Battery-Condition or Fuse F3 blown:

Power LED flashes

Fault LED is lit.


Figure 2 shows the detector wiring diagram for a typical residential alarm system.

Detection Circuit

Terminal No. Description

Intruder Zone-1

A13 & A14

Intruder alarm circuit. PIRs and contacts.

Intruder Zone-2

A15 & A16

Intruder alarm circuit. PIRs and contacts.
Zone-2 Isolated when Part-Set.

Intruder Exit / Entry

A11 & A12

Delayed intruder alarm circuit for the Entry/Exit route.
Entry timer adjustable 0 – 120s. Exit timer adjustable 0 – 120s.
PIRs and contacts.

Duress / Panic Circuit

A09 & A10

24hr circuit.

Fire Detectors

A03 & A04

24hr circuit. 24v optical & ionisation smoke, or rate-of-rise heat detctors.

Water Detectors

A05 & A06

24hr circuit. Water float switches.

Sabotage Circuit

A07 & A08

24hr circuit. This circuit Includes the Noby-65 lid microswitch.

End Of Line Resistors
The Noby-65 requires that all detection circuits be terminated with a 10K End Of Line resistor, to facilitate open-
circuit fault monitoring. For maximum security the EOL resistors should be connected at the last detection device
at the end of each cable run, and for this reason it is advised to ‘daisy-chain’ the cable, with no ‘T’ junctions. Only
one EOL resistor is permitted on each circuit, such that in steady-state condition the Noby-65 sees a circuit
resistance of 10kohm. Any detection circuit not being used must have its EOL resistor connected at the Noby-65

Auxillary 12v Detector Supply [A01,A02]
A 12V supply fused at F500mA (F2) is provided at terminals A01 & A02 to supply power for PIRs and other low
power electronic detection devices.