Nexus 21 A1557 technical specifications Technical Specifications

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Appendices

iTechnical Specifications

NOTE: Due to the wide scope of panel options, we strongly recommend the use of our battery calculation chart which is available on PC disk or as hard copy. The information below should not be used to calculate standby battery size.

Power Supplies

 

Mains input voltage:

230V AC -6% + 10%

System operating voltage:

24V DC

Quiescent current at 24V DC:

375mA (A1557. A1508, A1575 – no loop cards)

Quiescent loop card current

65mA + 1.3 x loop current

Loop card max. current

200mA

Power supply max:

5 Amps @ 24V DC

Alarm power output max:

1 Amp per circuit @ 24V DC (Note 3)

Auxiliary output max:

0.5 Amp @ 24V DC (Note 4)

Battery charger output:

1.5 Amps (Note 5)

Battery type:

24V sealed lead acid

Output Circuits

 

Alarm circuits:

2

Alarm circuit monitoring:

Open/short circuit (Note 6)

Repeater output:

Serial data RS485 (Note 7)

Printer output:

Parallel

Multiplex inputs/outputs:

248 (via A1535/A1536 boards)

Panel Network:

Connection of 15 panels via Network data link

Alarm fuse rating:

1 Amp thermal resetable fuse

Battery fuse rating:

6.3 Amp (20mm glass)

Auxiliary fuse rating:

0.5 Amp (20mm glass)

Mains fuse rating:

3 Amp (20mm glass)

Input Circuits

 

Detection loops:

Cable 1.5mm (max. length - 2km)

Detection loop fuse rating:

250mA thermal resetable

No. of sensors on loop:

126 maximum (Note 9)

Relay Outputs

 

2 independent relays are provided which operate as follows:

Fire relay:

1 double pole changeover, operates on any fire alarm

Fault relay:

1 single pole changeover operates on any fault signal

All relay contacts are rated at 24V DC 1 Amp.

 

Cable Terminations

 

 

Mains terminals:

Shrouded, marked & fused, accept max 2.5mm2 cables

Alarm and loop terminals:

Screw terminals, accept max. 2.5mm2

cables

All other terminals:

Screw terminals, accept max. 2.5mm2

cables

All terminal functions are identified by screen printing on the circuit boards.

Document Ref: Nex8inst.doc/Rev0 09.07.00

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Contents Contents Exploded View and Mechanical Data/Text Identification User Controls & IndicationsDisplay Lithium Battery LBAR1Power Supply Illustration NC1Ii A1536 8 Way Programmable Input/Output Alarm Board Loop Card Expansion MotherboardProgrammable Expansion Boards A1535 8 Way Programmable Input/Output Relay BoardImportant Notes on Batteries Document Ref Nex8inst.doc/Rev0 Number Loops Access level 1278 Overview of Engineer’s Menu OptionsAccessing Engineer’s Menu Access level 8812Setting Time & Date IsolateConfigure Loop EditDevice Status Status Disabled/Enabled ADR VAL Type STS CMDStatus To Printer Loop Contents Zones Alarm TestExtended Menu Alert Trip LevelPanel Delay Fire Trip LevelRead Memory Clear Print QueueProgramming the Number of Displays Repeaters Print Memory Contents Options Available at Access LevelPrint Cause and Effect Data Checklist Commissioning IntroductionAn Overview of the Commissioning Procedure Pre-Commissioning Wiring CheckCommissioning Procedure Alarm CircuitsCommissioning Loops Cause & Effect Testing Auxiliary CircuitsCause & Effect Editing Final CommissioningTechnical Specifications Ii Other Relevant Documentation Iii Compatible Loop Devices and Panel Responses 1XX= LED = LED Is in fire Fault Data fault AV = 0 to Operation and is