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Summary of Contents for Nexus A1557

• Page 1: Table Of Contents

  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.
• Page 2 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 &..
• Page 3 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.

• Page 4: Lithium Battery

  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..
• Page 5 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..
• Page 6 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. Two boards may be housed internally, the remainder require other enclosures.

• Page 7: Cabinet Installation

  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.
• Page 8 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. Return them to the battery manufacturer or take them to your Council tip for appropriate disposal.

• Page 9: Engineer's Functions

  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.

• Page 10: Panel Check

  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. Switch on.
• Page 11 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. 6:LOOP CONTENTS Panel reports loop content on the display.
• Page 12 Step 4 - Select the number of the engineer’s facility required by pressing the corresponding number button. Setting Time & Date At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 1:SET TIME/DATE. S E L E C T L E V E L 2 O P T I O N E N T E R..
• Page 13 0 1 : 0 0 1 D E - I S O L A T E D 1 . I S O 2 . D E - I S O Q U I T Press 2 to de-isolate Press 1 to isolate Loop &..
• Page 14 Selecting this option provides all the interrogation and control functions. All output functions are disabled and only the chosen device is being polled. This allows sensor devices to be put into the test mode without alarms, etc. being raised and allows observation of the rising analogue value.
• Page 15 The keypad keys 1, 2 & 3 become control switches for the 3 control panel command bits. (Indicated by the numbers 123 under the CMD indicators). Pressing key 1 causes command bit 1 to toggle between 0 and 1, key 2 for bit 2 and key 3 for bit 3.
• Page 16 025 16 123 21 HEAT 4 END OF LOOP REPORT Loop Contents At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 6:LOOP CONTENTS. Selecting option 6 causes the display to show a list of the devices currently configured without actually re-configuring the system.
• Page 17 This gives the option of adjusting the alert trip level of individual devices to suit particular installation conditions. To adjust the trip level follow the procedure below: At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 0:EXTENDED MENU. S E L E C T L E V E L 2 O P T I O N..
• Page 18 At Step 4 within the Engineer’s Menu (see Section 5.3 above), select 0:EXTENDED MENU. Select 3:PANEL DELAY. This will reveal the following: Setting the time period of day or night during which, if a fire condition occurred, the outputs would be delayed. * * S E T P A N E L D E L A Y S * *..
• Page 19 has its own DIL switch address setting. These addresses must be set in accordance with the repeater panel manual. The panel’s own display DIL switch setting must not be changed. * N U M B E R D I S P L A Y S * Displays current status D I S P L A Y 0 1_..

• Page 20: Commissioning

  WARNING: We strongly recommend that no local cause/effect editing should be attempted without the use of the pc down-load facility due to the extensive range of options available. However, if direct panel programming is unavoidable, a separate document entitled “Programming the Nexus 1-8 Loop Analogue Addressable Control Panel Without a PC” is available.
• Page 21 It is recommended that the electrical installer is made available until basic wiring continuity is proven. A minimum of two persons (e.g. engineer and mate) is recommended for efficient commissioning. An Overview of the Commissioning Procedure The approach to be used when commissioning a fire alarm system is to check each circuit and function in turn to ensure correct operation of the entire system.
• Page 22 Remove the resistor from the first alarm circuit terminal and connect the first alarm circuit wiring to the terminals, observing correct polarity. Check that any alarm fault indications clear after a few seconds. (ii) Press the “Evacuate” switch. Check that all sounders connected to the alarm circuit operate.
• Page 23 Refer to the Installation & Commissioning Manuals for these boards. Auxiliary Circuits Any auxiliary circuits or equipment which is not supplied as a standard part of the fire alarm panel is the responsibility of the installer and must be tested for safe and correct operation by the commissioning engineer.

• Page 24: Appendices

  Appendices Technical 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%..

• Page 25: Other Relevant Documentation

  NOTES: We strongly recommend the use of the Battery and Loop calculator for assessing the correct size of the standby batteries and correct loop function in all conditions. Quiescent current is stated assuming mains failure conditions, therefore the general fault LED will be illuminated and the fault buzzer will sound. The total current drawn by both alarm circuits operating must not exceed 2 Amps.

• Page 26: Compatible Loop Devices And Panel Responses

  Compatible Loop Devices and Panel Responses The following table shows all devices compatible with the panel. It shows the panel’s response to events from each device type, and indicates the change in analogue value and input bits that will be displayed in the status mode. Note that some device types automatically receive cause effect outputs by default. Any such programming is indicated in the default cause and effect column.
• Page 27 Device type Type Condition Panel response Analogue Value Status bits Output bits Default cause Comments Code (210) and effect Series 90 3-way Quiescent None AV = 8 to 44 0 = relay 1 X means status I/O analogue unit Input 1 operated Fire AV = 55 to 127 1 = relay 2..
• Page 28 Device type Type Condition Panel response Analogue Value Status bits Output bits Default cause Comments Code (210) and effect Series 90 zone Quiescent None AV = 16 Echo 0 = reset Bit 0 set on Program LED monitor Fire Fire AV = 64 output bits 1 = test..
• Page 29 Device type Type Condition Panel response Analogue Value Status bits Output bits Default cause Comments Code (210) and effect Series 90 optical Quiescent None AV = 8 to 44 Echo 0 = remote LED Bit 0 and bit 2 See note 1. smoke Fire Fire..
• Page 30 Device type Type Condition Panel response Analogue Value Status bits Output bits Default cause Comments Code (210) and effect XP95 heat Quiescent None AV = 8 to 44 Echo 0 = remote LED Bit 0 and bit 2 See note 1. detector high Fire Fire..