Nexus 21 A1557 technical specifications Commissioning Loops

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(i)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.

(iii)Press “Silence Alarms” and “Reset”.

(iv)Repeat steps (5.4.1) to (5.4.3) for the second and any subsequent alarm circuits.

6.4.2Commissioning Loops

NOTE: The pc down-load facility may be used at any stage up to Section (v).

(i)Insulate and physically protect the positive and negative ends of one end of the detection loop wiring. Connect the other end of the wiring to the panel terminals LO+ and LO- for loop 1.

(ii)Enter the engineers test mode at level 2 and select option 4 (Configure). After the configuration period, the panel will report the numbers of the different types of sensors. If the numbers and types of sensor agree with the physical check already carried out, proceed to the next stage (iv).

(iii)If double addressing of detectors is found on the loop, the LCD display will show a report of the device numbers affected. The engineer may also notice a device missing from the expected total quantity of loop devices.

(iv)When all required sensors have been configured, select engineer’s Option 5: STATUS and using the STATUS DISABLED option, interrogate the devices on an individual basis. To view correct electronic operation, press button for command bit 2 (self test mode). Press again to return detector to quiescent state. To turn a device LED on (to identify its correct location), press button for command bit 3. Press again to return detector to quiescent state. To turn a remote device LED on (to identify its correct location), press button for command bit 1. Press again to return detector to quiescent state.

(v)Repeat sections (i) to (iv) for each loop.

(vi)Sensor installation is now complete and the return end of the detection loop may now be connected to the LI+ and LI- terminals.

WARNING: Before connecting, ensure that the returning polarity is correct.

The final phase of the sensor commissioning involves replacing all the short circuit isolators. The supply polarity to isolators is important and must be checked and corrected if necessary before fitting the isolator.

WARNING: If the isolator polarity is found to be incorrect, it is absolutely essential that the polarity is corrected at each termination point throughout the wiring. Failure to observe this will result in the polarity of the return end of the cable becoming incorrect with the possibility of damage to the control panel.

6.5A1535 (Programmable Relay Expansion Boards) and A1536

(Programmable Alarm Expansion 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 NC1Programmable Expansion Boards Ii A1536 8 Way Programmable Input/Output Alarm BoardLoop Card Expansion Motherboard 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 IsolateEdit Configure LoopDevice Status Status Disabled/Enabled ADR VAL Type STS CMDStatus To Printer Extended Menu Loop ContentsZones Alarm Test Alert Trip LevelPanel Delay Fire Trip LevelClear Print Queue Read MemoryProgramming the Number of Displays Repeaters Options Available at Access Level Print Memory ContentsPrint Cause and Effect Data Checklist Commissioning IntroductionCommissioning Procedure An Overview of the Commissioning ProcedurePre-Commissioning Wiring Check Alarm CircuitsCommissioning Loops Cause & Effect Editing Cause & Effect TestingAuxiliary Circuits 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