• Nexus 1-8 Loop (A1557) Analogue Addressable Control Panel Installation and Commissioning Manual Contents Page Introduction and Guided Tour Cabinet Installation Engineer’s Functions Panel Check Panel Configuration Commissioning Appendices Technical Specifications Other Relevant Documentation iii. Compatible Loop Devices and Panel Responses Introduction Thank you for purchasing this Nexus 1-8 loop analogue addressable control panel. • 1.1.1 Exploded View and Mechanical Data/Text Identification Motherboard Expansion Motherboard Display board assembly mounted on removable door Loop Cards Loop Cards Expansion Cards Network Card A1535 8 way relay A1536 8 way alarm Power Supply Board Space for Internal 12AH Battery Set Printer 1.1.2 User Controls &. • System disabled illuminated when Press to reveal detectors or inputs more messages on are isolated the LCD display General fault Silence alarms LCD display illuminates when System Reset control. Press Press to test the 4 x 20 character line a general system to silence the control.

• Field terminals keyboard port Alarm Alarm Aux Flt Repeater Remote inputs Network Loop1 Loop 2 Aux Fire - + - A1549 zone board interface Fuse8 24V 1A J5 - PC port Fuse 7 24V 1A Display B1 - Lithium U2 EPROM terminals clock battery J4 A1558 expansion. • A1557 Field Terminal List [Listed along the top edge of the PCB from left to right] Terminal Ident. Function Terminal Ident. Function Aux Fire NO 1 Fire relay normally open 1 Alarm 1 Sounder circuit 1 + [Active polarity] Fire relay normally closed 1 Sounder circuit 1 - [Active polarity] Fire relay pole 1 Alarm 2. • 1.1.7 Loop Card Expansion Motherboard Loop 3 Loop 4 Loop 5 Loop6 Loop 7 Loop 8 1.1.8 Programmable Expansion Boards Up to 31 A1535 (relay) and A1536 (alarm) programmable expansion boards may be connected to the Nexus 1-8 loop (A1557) panel.

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Two boards may be housed internally, the remainder require other enclosures. • Cabinet Installation WARNING: Please read this section completely before commencing installation.

Prior to commencing installation of the control panel, ensure that adequate precautions are taken against static damage to the sensitive electronic components on the control board. You should discharge any static electricity you may have accumulated by touching a convenient earthed object, e.g.

• DANGER: Do not incinerate batteries. If placed in a fire, the batteries may rupture, with the potential to release hazardous gases and electrolyte. VRLA batteries contain substances harmful to the environment. Exhausted batteries must be recycled. Rza Bobby Digital Digital Bullet Rarity here. Return them to the battery manufacturer or take them to your Council tip for appropriate disposal. • Engineer’s Functions A number of engineering functions are provided by the control unit in order to allow the system to be configured specifically to accommodate site requirements.

Further functions are provided to assist in commissioning and servicing the finished fire detection system. There are three separate codes for access to the three engineer function levels. • Panel Check Ensure that the mains supply has been inspected and tested in accordance with BS5839 Part 1 and the current IEE regulations and that the system is correctly earthed. Leave all test resistors in place and connect the 230V mains supply.

• used on the loop (i.e. Ionisation smoke, optical smoke, or heat sensor) 5:DEVICE STATUS The analogue value can be identified & the detector self-tested, the detector LED and the Remote LED can be turned on either in the enabled mode or the disabled mode.