Gpn Lm Application Specification

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TITLE TECHNICAL BULLETIN GPN_LM APPLICATION DRAWN MF APPROVED MDF SHEET 1 OF 8 ISSUE DATE A 22/6/2007 DRAWING NUMBER LGTB001 DATE APPROVED 15/12/06 CHANGE DRAFT – release for review SCOPE This product application bulletin applies to GPN-LM variants: GPN-LM1D/1A GPN-LM1D/3A GPN-4A The GPN-LM (General Purpose Node – Light Monitoring) is an instance of the General Purpose Node configured for the task of monitoring mains lighting. The purpose of the GPN-LM is to raise an alarm when the mains lighting in an area is not in the correct state for that time of day. The GPN-LM is connected to a Nexus Emergency Lighting Monitoring System data cable network but is essentially independent of that system. For details concerning the installation and operation of a Nexus emergency Lighting Monitoring System refer to the manual (Stanilite Nexus LX User and Technical Guide - ver 1.0). This product application advice has been issued in response to a new requirement that the GPN-LM operates correctly when the mains lighting is switched on and off under control of local PIR presence detecting switches and refers to features only to be found in new versions of the software. NEXUS SYSTEM REQUIREMENTS Nexus Software: version 3.2.28 or later Existing sites with older versions of the Nexus software must be upgraded to this new version. In some cases where the existing Nexus system is very old (running the old 16 bit version of the Nexus software) it may be necessary to upgrade the PC to the current minimum standard: Nexus Server Hardware: Intel Celeron D 347 3.06GHz 533Mhz 512K LGA775 CPU 512MB DDR2 RAM for Desktop PC 80Gb SATA II 8Mb Cache Hard Disk 52x 32x 52x CD-RW IDE Drive 56K V.90 Data/Fax/Voice Hardware modem Microsoft Windows XP Professional Edition SP2 FILENAME: X:\Technical Bulletins\Master\LGTB001A-GPN_LM_Application_Specification.doc SAVED: 6/22/2007 4:20:20 PM BY: Created by MDF PRINTED: Last printed 6/22/2007 4:20:00 PM TITLE TECHNICAL BULLETIN GPN_LM APPLICATION ISSUE A SHEET 2 OF 8 DRAWING NUMBER LGTB001 GPN-LM OPERATION The primary purpose of the Nexus Light Monitoring function is to monitor the status of (non-emergency) light fittings and to generate an alarm if there is a fault. A fault is defined by the user as any combination of light fittings switched off, lamps not lit or light fittings switched on at the same time as lamps not lit. The GPN-LM is fitted with one main processor card and up to 4 interface cards. The processor card is connected to the Nexus data cable network. The interface cards are used to convert external signals to a format useable by the processor card. There are 2 types of interface cards used with the GPN-LM: analogue input and digital input. The analogue input cards are configured to monitor Light Dependant Resistors (LDRs). Each card has 4 input channels so 4 different LDRs can be monitored by each card. An LDR can be fitted either to an individual light fitting or to a general area light sensor mounted in the ceiling. In both cases the LDR is connected to the analogue input card by a length of shielded instrumentation cable. The digital input cards are configured to monitor the switched mains supply to the lamps. For example – if a bank of 10 light fittings is controlled by a single switch then the switched active should be monitored by a single mains input to the GPN. The lamps themselves may be monitored by 10 individual LDR inputs or perhaps by one or more general area sensors. Individual monitoring is superior to general area monitoring because it supplies specific information on lamp failure. If the lamps are switched by a PIR switch fitted with a set of volt-free contacts then the digital cards can if necessary be configured to monitor this instead of the switched active. This is a hardware configuration alternative and is normally set in the factory although it is possible to convert a card in the field. The digital cards each have 4 LEDs to indicate the state of the inputs – on or off. The GPN-LM monitors both analogue (LDR) inputs and digital (mains) inputs and provides the status of the inputs to the Nexus server PC. The Nexus software on the PC then processes the inputs from the GPNs and if necessary displays an alarm symbol on the screen. There are currently 3 variants of the GPN-LM supplied by the factory: GPN-LM1D/1A has 1 digital card (mains detect) and 1 analogue card (LDR input). GPN-LM1D/3A has 1 digital card (mains detect) and 3 analogue cards (LDR input). GPN-4A has 4 analogue card4 (LDR input). They can be used on site in any combination. GPN-LM INSTALLATION GPN-LMs should be located in the vicinity of the lights they are monitoring so that the length of signal cables for each analogue channel can be minimised. Each GPN requires a GPO for mains power and FILENAME: X:\Technical Bulletins\Master\LGTB001A-GPN_LM_Application_Specification.doc SAVED: 6/22/2007 4:20:20 PM BY: Created by MDF PRINTED: Last printed 6/22/2007 4:20:00 PM TITLE TECHNICAL BULLETIN GPN_LM APPLICATION ISSUE SHEET A 3 OF 8 DRAWING NUMBER LGTB001 should be connected to the Nexus data cable network in the building in the same way as any Nexus emergency light fitting. (Refer to the Nexus Manual - Installation Guide). For the analogue signal cable T&B suggest using the Nexus data cable (NXS-1PS/A-500 shielded twisted pair cable with stranded conductors). There is no absolute limit to the distance the cable can run between GPN and LDR sensor however 50m would be a sensible limit. The main problem that may arise with long runs of cable is excessive (EM) noise pickup. For this reason it would also be sensible to ensure that the cables are not run up against noisy mains cables or near noisy loads. The signal cable should be treated like any other data cable and be installed in compliance with the data cabling rules (AS/ACIF S009:2006). Nexus Data connection LDR connection Mains sense connection A GPN-LM-1D-1A can accept up to 4 LDR inputs and 4 mains sense inputs. A GPN-LM-1D-3A can accept up to 12 LDR inputs and 4 mains sense inputs. A GPN-LM-4A can accept up to 16 LDR inputs. Any logical association between GPN inputs is done within the Nexus server by the user – any such association does not depend on which particular GPN a signal is connected to. It is important to record the location details of each of the mains circuits and light fittings monitored by the GPN. When the time comes to service a faulty lamp or connection, the location information will be essential. FILENAME: X:\Technical Bulletins\Master\LGTB001A-GPN_LM_Application_Specification.doc SAVED: 6/22/2007 4:20:20 PM BY: Created by MDF PRINTED: Last printed 6/22/2007 4:20:00 PM TITLE TECHNICAL BULLETIN GPN_LM APPLICATION ISSUE A SHEET 4 OF 8 DRAWING NUMBER LGTB001 WIRING CONNECTIONS TO THE GPN-LM There is an 8-way pluggable terminal block provided for each of the input cards. The label on the top of the GPN shows the wiring connections. For more detail see the sample wiring diagrams attached at the end of this document. Data connection The GPN is supplied with a 3 way green pluggable terminal block for the data connection to the Nexus network. This plugs into the top of the 8 way socket on the processor card. The other connections in this socket are used for remote mounting of service request switch and service request LED if required. LDR connections Each analogue connection consists of a ground terminal and a signal terminal which should be connected to the twisted pair in the signal cable. The LDR is connected across the cable pair at the far end of the cable. Note that the cable shield should be connected to the ground terminal at the GPN connector but left open at the LDR end of the cable. The ground pins are the even numbered contacts in each 8 way connector. Mains signal connections Note that when the digital input card is configured for mains input it comes with a connector shroud which is used to prevent accidental contact with the mains voltage connections. Each of the mains inputs is optically isolated so there is no need to be concerned with phase differences. GPN COMMISSIONING Once the GPNs are all installed they must be commissioned into the Nexus system. Refer to the Nexus manual for details on commissioning. Start Nexus and select the channel to which the GPN is connected. To commission a GPN-LM select GPN LM from the device list in the Add Device form and press the Service Request button (SR Switch) on top of the GPN unit in question. When the GPN is commissioned an icon like this one will be displayed in the Channel Display. The next step is configuration. FILENAME: X:\Technical Bulletins\Master\LGTB001A-GPN_LM_Application_Specification.doc SAVED: 6/22/2007 4:20:20 PM BY: Created by MDF PRINTED: Last printed 6/22/2007 4:20:00 PM TITLE TECHNICAL BULLETIN GPN_LM APPLICATION ISSUE A SHEET DRAWING NUMBER 5 OF 8 LGTB001 GPN-LM CONFIGURATION To configure the GPN, double click on the GPN-LM icon or right click on it and select Properties. Select the GPN tab to display the GPN configuration screen. The configuration properties of the GPN are stored within the GPN itself but can be edited using Nexus. Configuration involves: defining an input as analogue or digital enabling or disabling each input calibrating the analogue inputs so that the LDRs correctly register light on and light off. A GPN out of its box should come ready with a basic level of configuration – each of the input cards should already be correctly identified. If not the first step is to set each of the input card types to match the GPN. Use the pull down box below each set of 4 to set the card type to match the cards fitted to the GPN unit. GPN type GPN-LM-1D-1A GPN-LM-1D-3A GPN-LM-4A I/O card 1 (ch 1-4) I/O card 2 (ch 5-8) I/O card 3 (ch 9-12) I/O card 4 (ch 13-16) Analogue Analogue Analogue Analogue Analogue Analogue Analogue Digital Digital Analogue The Nexus software on the Nexus server stores a default configuration for both analogue and digital channels which can be applied to the GPN if required – however this configuration is generally only a starting point as each of the LDRs must be individually calibrated to the lighting conditions to which it is exposed. Each of the (max) 16 channels in a GPN is represented by an ON or OFF icon in the form. To show the current configuration of a channel, select the channel by clicking on its icon or select the channel from the pull down list in the Configuration details section of the form. The configuration details can be edited. If the changes are acceptable then click the Apply button. To apply the configuration to more than one channel, select multiple channels using CTRL Click then click Apply. To save the configuration as default press Save as Default. To retrieve the default configuration press Get Default. LDR CALIBRATION The LDR light sensor is a variable resistor which changes its resistance depending on the light level – low resistance equals high brightness. LDRs by their nature are low tolerance devices – two LDRs of the same type exposed to the same light level will have very different resistances. The amount of light falling on the LDR when mounted in a light fitting will depend on minor differences in how the LDR is mounted and on the exposure to stray light from sunlight or other light fittings. Each LDR must be calibrated and a reference level set so that resistance below the level indicates light on and above the level indicates light off. It is also necessary to set a hysteresis level so that small changes in light around the reference level do not trigger an alarm. This is achieved with an ON reference value and an OFF reference value. With this arrangement the light is not deemed to be on until the light level goes above the On reference value but is FILENAME: X:\Technical Bulletins\Master\LGTB001A-GPN_LM_Application_Specification.doc SAVED: 6/22/2007 4:20:20 PM BY: Created by MDF PRINTED: Last printed 6/22/2007 4:20:00 PM TITLE TECHNICAL BULLETIN GPN_LM APPLICATION ISSUE A SHEET DRAWING NUMBER 6 OF 8 LGTB001 not deemed to be off until the value goes below the OFF reference value. The ON value must be set above the OFF value. 100% cal level Actual light level converted to percentage ON ref level % OFF ref level% ON state registered OFF state When an LDR input is measured by the GPN a raw numeric value is generated in the theoretical range 200 to 65535 where a large number represents a bright light. In practice the range is approx 1000 for an LDR in darkness to 12,000 for an LDR in full light. The analogue quantity is read periodically by the GPN (150mSecs per channel) and the resultant values are averaged. This raw value is converted into a percentage where 100% is the light level detected at the moment of calibration. To calibrate an LDR input, ensure that the light level is at the maximum and click “calibrate” for that channel. Each channel has its own on level and off level reference values but these can be set globally using a set of default values. Note that if the ON value is set too high then the natural variance or deterioration in light level due to temperature or age may result in the signal not registering as on. Similarly if the OFF value is set too low then natural or artificial stray light may cause the signal to not register as off. Use the default settings as a guide and adjust for actual site conditions if necessary. Averaging signals The analogue signals are averaged to reduce the effects of electrical noise in the signal and fast variations in light level. A raw value is collected by each channel of the interface cards every second or so. The method uses a running average – and the length of the running average can be specified by the user. Time-of-day dependant signals Each input on the GPN can be programmed to transmit input changes only during a single time window in a 24 hour period. It may be, for instance, that an alarm is only of interest during night time when there is no interference from sunlight through windows – in this case the signal from the GPN can be disabled from say 5am to 6pm. In order for the GPN to be able to respond correctly, the time of day is maintained in it using a real time clock which is automatically synchronised with the Nexus server clock. FILENAME: X:\Technical Bulletins\Master\LGTB001A-GPN_LM_Application_Specification.doc SAVED: 6/22/2007 4:20:20 PM BY: Created by MDF PRINTED: Last printed 6/22/2007 4:20:00 PM TITLE TECHNICAL BULLETIN GPN_LM APPLICATION ISSUE A SHEET 7 OF 8 DRAWING NUMBER LGTB001 ALARM SETUP The Nexus software is used to associate individual mains inputs and lamp sensor inputs across multiple GPNs. The signals are grouped together in what are called “alarm groups”. To access the Alarm Setup form select Tools-GPN-LM-Alarm Setup from the main menu. The form will list all of the GPN-LM inputs that have been configured. Alarm groups Each signal has a designation in the form -, , eg a GPN that has been commissioned as SPU_ID = 27 and has 3 analogue input cards configured for LDRs and one digital card configured for mains will have a signal list as follows: 27-1, LDR, location_1 27-2, LDR, location_2 27-3, LDR, location_3 . . . 27-12, LDR, location_12 27-13, mains, location_13 27-14, mains, location_14 27-15, mains, location_15 27-16, mains, location_16 The signals from all of the GPNs in the network will be in the list. The location description is a string input by the user to describe the location of the LDR sensor or mains sensor. When the sensors are installed the location must be recorded so that the information can be put into the database. For a signal to be part of an alarm it must be placed in an alarm group. Alarm groups must be created by the user. To do this select Tools - GPN LM- Alarm Setup – Add Alarm. The Alarm group name created by the system can be edited by the user. There are basically two types of alarm group. The first is a selection of LDR or mains signals that are simply “ORed” together eg Alarm Group 1 OR 27-1, LDR, location_1 27-2, LDR, location_2 27-3, LDR, location_3 27-14, mains, location_14 27-15, mains, location_15 In this case Alarm Group 1 will activate if any of the 3 LDR inputs or 2 mains inputs included goes off. FILENAME: X:\Technical Bulletins\Master\LGTB001A-GPN_LM_Application_Specification.doc SAVED: 6/22/2007 4:20:20 PM BY: Created by MDF PRINTED: Last printed 6/22/2007 4:20:00 PM TITLE TECHNICAL BULLETIN GPN_LM APPLICATION ISSUE A SHEET 8 OF 8 DRAWING NUMBER LGTB001 The second type is a selection of LDR signals and a single mains input. If the mains signal is off then he LDR signals are ignored. If the mains is on and any of the LDR signals is off then the alarm is activated. Alarm Group 2 AND 27-4, LDR, location_4 27-5, LDR, location_5 27-6, LDR, location_6 27-16, mains, location_16 This combination is used when a particular switched active mains circuit is powering a group of lamps – the switch could go on or off at any time (eg PIR controlled switch) – the alarm is only generated when one or more of the lamps fails to light. To create an OR group, first create an Alarm Group then simply select each of the input signals together with the Alarm group (using CTRL Click) and then select Bind OR. To create an AND group select a set of analogue LDR signals together with a single mains digital signal and select Bind AND. Alarm display When an alarm is triggered it is listed in the Alarm Display form. To see this select Tools - GPN LMAlarm Setup – Alarm Display. This display will show the current alarms, together with the date and time the alarm was raised and the current status of the inputs to the alarm. The inputs that triggered the alarm are marked with an asterisk (*). PART NUMBER LIST GPN-LM-1D-1A GPN-LM-1D-3A GPN-LM-4A NXS-1PS/A-500 FILENAME: X:\Technical Bulletins\Master\LGTB001A-GPN_LM_Application_Specification.doc SAVED: 6/22/2007 4:20:20 PM BY: Created by MDF PRINTED: Last printed 6/22/2007 4:20:00 PM