RTK NEX7250 Manual

Zone 2 annunciator

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Warning

The NEX7250 System described herein operates on a logic voltage of 24VDC and as standard

24VDC is used for the field contact supply voltage. External power supplies using higher voltage

AC/DC primary sources and optional high voltage field contact voltages may be present if this is the

case please ensure the necessary precautions are taken.

REV

DATED

DESCRIPTION

26/6/03

Original

29/05/07

Minor corrections

19/05/08

Updated to new Standards

05/01/10

Removed high risk impact warning

NEX7250 Zone 2 Annunciator

AUTHOR

APPROVED

D.Adams

T McLeman

D.Adams

P.Cartmell

D.Adams

T McLeman

D.Adams

P.Hartley

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Summary of Contents for RTK NEX7250

Page 1 NEX7250 Zone 2 Annunciator Warning The NEX7250 System described herein operates on a logic voltage of 24VDC and as standard 24VDC is used for the field contact supply voltage. External power supplies using higher voltage AC/DC primary sources and optional high voltage field contact voltages may be present if this is the case please ensure the necessary precautions are taken.
Page 2 © RTK Instruments LTD 2008 The copyright in this work is vested in RTK Instruments Ltd and this document is issued for the purpose only for which it is supplied. No licence is implied for the use of any patented feature. It must...
Page 3: Table Of Contents
NEX7250 Zone 2 Annunciator Contents 1. I ...................... 6 NTRODUCTION 2. I ..................... 7 NSTALLATION UIDE 3. F ..................8 RONT XAMPLES 4. NEX7250 E ..................9 NCLOSURE 4.1 General ............................. 9 4.2 Panel mount ..........................9 4.3 Wall Mount ..........................10 4.4 Alarm connections ........................
Page 4 13.17 Total Group Relay (Option RTG) ..................44 13.18 SPR Module (Supply-Pushbuttons-Relay Module) ............44 13.19 Logic Power Connections ....................44 13.20 Signal Supply Voltage Connections ................... 44 14. NEX7250 C ............... 45 ONNECTION ETAILS 14.1 Typical Panel mount wiring ....................45 14.2 Typical Wall mount wiring ....................
Page 5 NEX7250 Zone 2 Annunciator 16.2 Optional Version With Repeat Relay Facility ............... 49 17. S ............50 MALL INDOW LARM ODULE IRING 17.1 Standard Version Without Repeat Relay Facility ..............50 17.2 Optional Version With Repeat Relay Facility ............... 50 18.
Page 6: Introduction
1. Introduction The NEX7250 combines the RTK 725 Series Alarm Annunciator installed in an IP rated enclosure and self certified to comply with the international standard IEC 60079-15. The unit is self certified to Ex nA [nL] IIC T4, with an ambient temperature range of -20°C to +50°C. The IP rated enclosure is available in two forms: A wall mount IP55 rated enclosure or a panel mount IP54 rated enclosure.
Page 7: Installation Guide
NEX7250 Zone 2 Annunciator 2. Installation Guide This product has been certified to be mounted in a zone 2 (equipment category 3) hazardous area. Equipment must be installed in accordance to IEC60079-14 (Electrical installation in hazardous areas). There are various requirements that need to be met in order for this equipment to be used safely.
Page 8: Front View Examples
3. Front View Examples SMALL LAMP NO 1 FULLY PROTECTION WINDOW AIR COOLER FIELD TRIP COLOURS VERSION FAILURE PROGR AVAILABLE 30 X 30 MM VERSIONS OPTIONAL LASER NO 2 SERIAL WINDOW PRINTED PRESSURE AIR COOLER INTERFACE FAILURE COLOURS FILM FAILURE CARD AVAILABLE LEGENDS...
Page 9: Nex7250 Enclosure
RESET POWER This type of NEX7250 allows the user to connect external pushbuttons which can then be mounted in a suitable control panel. If this panel is situated in the Zone 2 area, zone 2 certified pushbuttons must be used. The customer may also incorporate a Zone 2 isolator into the enclosure to allow then...
Page 10: Wall Mount
POWER 4.4 Alarm connections Due to the type of application the NEX7250 is used in the user may connect their alarms from any zone. If these alarms are associated with a hazardous area suitable protection must be used. For connections to a safe area it is recommended fused terminals are used, either in the enclosure or from the area in which they are coming from.
Page 11: External Power Supply
4.7 Certification The NEX7250 is self-certified to Ex nA [nL] IIC T4 (where [nL] is for associated apparatus connected to the relays) conforming to IEC60079-15. The [nL] is used because that the unit contains relays which could cause sparking in normal operation. To conform to the standard the unit must contain the following information: Name of manufacturer or his registered trade mark –...
Page 12: Documentation
Ui=24V, Ii=45mA, Pi=1.3W WARNING: POTENTIAL ELECTROSTATIC DISCHARGING HAZARD - SEE INSTRUCTIONSS KNARESBOROUGH UK. INSTRUMENTS 4.9 Documentation All NEX7250 systems will be supplied with there own Certificate. A complete test report detailing the system conforming to IEC60079-15 is available on request.
Page 13: P725 Description And Features
NEX7250 Zone 2 Annunciator 5. P725 Description and Features 5.1 General Annunciators are manufactured to meet individual customer's requirements using separate "cells" which can be assembled in configurations from 1 to 16 cells high and 1 to 16 cells wide as required.
Page 14: Laser Printed Legends
Laser printed film legends are easily generated, from within Microsoft Excel, in a font style and size to suit individual applications. A software template is available, free of charge from RTK, which allows the user to produce film legends locally if required. Completed film legends are located between the clear front lens of the removable window assembly and the associated coloured filter and diffuser.
Page 15: Window Numbering System
NEX7250 Zone 2 Annunciator 5.6 Window Numbering System RTK have adopted the following window numbering system to aid with the location of the film legend and the associated alarm cards. This method is used to ensure that the legend matches the functions selected for the designated alarm.
Page 16: Pushbutton / Programming Module Options
5.9 Pushbutton / Programming Module Options The pushbutton/programming module is normally integrally mounted within the annunciator however if required it can be supplied as a stand alone item suitable for panel mounting, DIN-rail mounting or wall mounting. 5.10 Fully Field Programmable In addition to controlling the alarm sequence the pushbutton module is also used as a configuration tool to programme the required features on the annunciator.
Page 17: Automatic Mute Or Automatic Acknowledge
NEX7250 Zone 2 Annunciator Sleep Mode Jumper Location MULT SUPPLY 24VDC OV O VC +V +VC T Side View Assy Pt No CB4642POP1 Sleep Mode Switch 5.12 Automatic Mute Or Automatic Acknowledge Each annunciator is equipped with an integral timer that can be enabled to allow the user to automatically mute or acknowledge alarms after a pre-set time delay.
Page 18: Integral Audible Alarm
Auto Mute / Ack Delay Switch Location (Information Plate Removed) CB4072POP Posidrive screws A4219-* Automatic Acknowledge or Silence Time Selection FUNCTION SW7-1 SW7-2 SW7-3 SW7-4 Automatic acknowledge Automatic mute Disable automatic timer Enable 1 minute time delay Enable 4 minute time delay Enable 8 minute time delay 5.13 Integral Audible Alarm Each annunciator is equipped with an internal 3.5kHz 95dB(A) audible located behind the integral...
Page 19: Remote Pushbutton Inputs
STATUS 5.14 Remote Pushbutton Inputs Because the NEX7250 has to be mounted in an IP rated enclosure these pushbuttons will not be accessible in the Zone 2 area. Remote pushbuttons can be connected to the P725 SPR module either in place of or in addition to the integral pushbuttons or to allow multiple annunciators to share common pushbuttons for example a common mute pushbutton mounted in the operator desk console.
Page 20: Terminations
Remote Pushbutton Wiring MULT SUPPLY 24VDC OV OVC +V +VC T A R ST M FR FIRST RESET MUTE SYSTEM TEST RESET ACKNOWLEDGE LAMP TEST 5.15 Terminations All active cells within the annunciator are provided with quick disconnect (2) part pluggable, rising clamp, terminals capable of accepting up to 2.5mm²...
Page 21: Inputs
NEX7250 Zone 2 Annunciator 6. Inputs 6.1 Optically Coupled Inputs All alarm inputs are provided with fully isolated inputs using optical couplers and a transient filter is built into the input circuitry so that low voltage interference will be ignored.
Page 22: Input Time Delay - Option Ad
6.4 Input Time Delay – Option AD* As an option each channel can be provided with a potentiometer, which allows the user to select a time delay to prevent the alarm from occurring unless it has been present for a pre-defined period. Option AD1 = Adjustable Delay Range 5 –...
Page 23: Outputs
NEX7250 Zone 2 Annunciator 7. Outputs 7.1 Common Outputs All series 725 annunciators are equipped with five common output relays located on the upper card of the SPR module. (Part no CB7081POP1). As standard all five relays are factory set to be normally energised and will de-energise when activated.
Page 24: Critical Horn Relay - Hna
SPR Card Showing Relay And Jumper Locations CONTACT STATE FUNCTION REF. RELAY LINK OPEN CLOSED Critical horn relay Non critical horn relay Critical group relay Non-critical group relay Multifunctional relay MULT. FUNCT. GROUP HORN RELAY RELAY RELAY CONTACT SET NORMALLY CLOSED RL4 - GPB RL2 - HNB GROUP RELAY...
Page 25: Critical Group Relay - Gpa
NEX7250 Zone 2 Annunciator 7.4 Critical Group Relay - GPA When an alarm occurs the relay will change state and remain in the alarm condition until all alarms in the group have returned to normal and the logic has been reset. Each channel can be set to operate the critical group relay as required.
Page 26: Technical Specifications
8. Technical specifications FEATURES DETAILS Each channel can be set to operate from either a normally open or Input type normally closed contact as required Standard version 24VAC/DC 9V to 33V Signal voltage Normally Open 20 K Ohm maximum series resistance Contact resistance Normally Closed 50 K Ohm minimum parallel resistance Contact current...
Page 27: General
The table below indicates the maximum numbers of alarm channels that can be connected to a standard power supply from the RTK range of products. Each PSU provides a 24VDC output for use as the logic voltage to the annunciator.
Page 28: Mechanical Details
9.1 Panel Mounting Clamps (panel mount version only) The NEX7250 panel mount version is shipped with the panel mounting clamps fitted to the sides of the enclosure these must be removed to allow the unit to be placed in the panel cut out and secured from behind.
Page 29: Alarm Sequences
NEX7250 Zone 2 Annunciator 10. Alarm Sequences 10.1 Summary Each channel within the annunciator can be set to operate in a pre-defined manner in accordance with internationally recognised standards ISA-S18.1 1979 (R2004) alarm sequences. Typically when an alarm occurs the associated window will flash and the operator uses specific pushbuttons to control the audible alarm and associated lamps or LED’s:-...
Page 30: Additional Features
Four different first-up sequences are available F0, F1, F2 and F3 as detailed below and in the following sequence tables. F0 The standard mode adopted by RTK Instruments, which indicates the first-up alarm by flashing at twice the rate of subsequent alarms.
Page 31: Sequence Configuration And Tables
NEX7250 Zone 2 Annunciator 12. Sequence Configuration and Tables Each pair of alarm channels can be configured to suit the operating sequence required, as listed in the ISA publication "Annunciator sequences and specifications" S18.1 1979.(R2004). Systems can be configured with different features on each individual channel and there is no need to switch the power off when making these changes.
Page 32: Isa-Sequence A
12.2 ISA-Sequence A Automatic Reset SEQUENCE DIAGRAM PROCESS NORMAL ABNORMAL SEQUENCE NORMAL ACKNOWLEDGE WHILE NORMAL VISUAL RETURN TO NORMAL AUDIBLE SILENT ABNORMAL PROCESS ABNORMAL PROCESS OR NORMAL ACKNOWLEDGE SEQUENCE ACKNOWLEDGED SEQUENCE ALARM WHILE ABNORMAL VISUAL VISUAL FLASHING AUDIBLE SILENT AUDIBLE AUDIBLE SEQUENCE ISA A (LOCK IN)
Page 33: Isa-A-4 Sequence
NEX7250 Zone 2 Annunciator 12.3 ISA-A-4 Sequence - Non Lock-In Function SEQUENCE DIAGRAM PROCESS NORMAL ABNORMAL SEQUENCE NORMAL RETURN TO NORMAL VISUAL RETURN TO NORMAL AUDIBLE SILENT ABNORMAL PROCESS ABNORMAL PROCESS OR NORMAL ACKNOWLEDGE SEQUENCE ACKNOWLEDGED SEQUENCE ALARM WHILE ABNORMAL...
Page 34: Isa-R Sequence
12.4 ISA-R Sequence - Ringback S E Q U E N C E D IA G R A M P R O C E S S N O R M A L A B N O R M A L S E Q U E N C E N O R M A L V IS U A L...
Page 35 NEX7250 Zone 2 Annunciator SEQUENCE TABLE ALARM PROCESS PUSHBUTTON SEQUENCE VISUAL LINE AUDIBLE REMARKS CONDITION OPERATION STATE DISPLAY DEVICE NORMAL NORMAL SILENT FAST ABNORMAL ALARM AUDIBLE LOCK-IN FLASHING MAINTAINED ABNORMAL ACKNOWLEDGE ACKNOWLEDGED SILENT ALARM MOMENTARY NORMAL ACKNOWLEDGE TO LINE 4...
Page 36: Isa-F1A Sequence
12.5 ISA-F1A Sequence Automatic Reset First-Up SEQUENCE DIAGRAM PROCESS NORMAL RETURN FIRST TO TO NORMAL ABN ORMAL SEQUENCE NORMAL ACKNOWLEDGE SUBSEQUENT WHILE N ORMAL TO ABNORM AL VISUAL (FIRST OUT RESET) AUDIBLE SILENT ABNORMAL PROCESS ABNORMAL PROCESS OR NORMAL SEQUENCE ACKNOWLEDGED SEQUENCE FIRST ALARM...
Page 37: Isa-F2M-1 Sequence
NEX7250 Zone 2 Annunciator 12.6 ISA-F2M-1 Sequence Manual Reset First-Up SEQUENCE DIAGRAM PROCESS NORMAL FIRST TO RESET WHILE SEQUENCE NORMAL ABNORMAL NORMAL VISUAL AUDIBLE SILENT SUBSEQUENT TO ABNORMAL ABNORMAL PROCESS OR NORMAL SILENCE SUBSEQUENT SEQUENCE ALARM ACKNOWLEDGE VISUAL AUDIBLE ABNORMAL...
Page 38 SEQUENCE TABLE ALARM PROCESS PUSHBUTTON SEQUENCE VISUAL LINE AUDIBLE REMARKS CONDITION OPERATION STATE DISPLAY DEVICE NORMAL NORMAL SILENT FIRST ABNORMAL FIRST ALARM FLASHING AUDIBLE LOCK-IN SUB. ABNORMAL SUB. ALARM AUDIBLE LOCK-IN ABNORMAL FIRST OUT FIRST OR NORMAL RESET ACKNOWLEDGE TO LINE 7 BEFORE SIL ABNORMAL SUB.
Page 39: Isa-F3A Sequence
NEX7250 Zone 2 Annunciator 12.7 ISA-F3A Sequence - Automatic Reset First-Up SEQUENCE DIAGRAM PROCESS NORMAL FIRST TO SEQUENCE NORMAL ABNORMAL RETURN TO NORMAL VISUAL AUDIBLE SILENT ACKNOWLEDGE SUBSEQUENT TO WHILE NORMAL ABNORMAL ABNORMAL PROCESS OR NORMAL FIRST OUT RESET SUBSEQUENT...
Page 40 SEQUENCE TABLE ALARM PROCESS PUSHBUTTON SEQUENCE VISUAL LINE AUDIBLE REMARKS CONDITION OPERATION STATE DISPLAY DEVICE NORMAL NORMAL SILENT INTERMITTENT FIRST ABNORMAL FIRST ALARM AUDIBLE LOCK-IN FLASHING FAST SUB. ABNORMAL SUB. ALARM AUDIBLE LOCK-IN FLASHING FIRST OUT ABNORMAL FIRST OUT FIRST RESET BEFORE TO LINE 3 OR NORMAL...
Page 41: Options
NEX7250 Zone 2 Annunciator 13. Options 13.1 General The standard 725 Series alarm annunciator is designed to meet the majority of alarm specifications but in certain applications additional options may be required. Please note:- The following options are usually specified at the time of ordering. Please consult factory if you would like to check suitability of adding options to existing units.
Page 42: Individual Channel Dual Repeat Relays (Option Rl2)
Display Follower The individual relay will activate when an alarm occurs and faithfully mimic the state of the output drive to the associated lamp (flashing, on or off) FEATURE FUNCTION SETTING Display follower 13.5 Individual Channel Dual Repeat Relays (Option RL2) In applications that require two repeat relay outputs for each channel a dual channel alarm card complete with repeat relays and a dual channel relay card are required.
Page 43: Supply Input/Output Module (Option Si/O)
NEX7250 Zone 2 Annunciator 13.9 Supply Input/Output Module (Option SI/O) The SI/O module is required in the following instances: - 1. In larger systems to distribute the 24VDC logic supply load evenly 2. To interlink multiple annunciator cabinets together to form larger systems 3.
Page 44: Group Relays Follow Inputs (Option Gfi)
13.15 Group Relays Follow Inputs (Option GFI) Option GFI allows the GPA and GPB group relays to follow the function of the alarm contact. If an alarm occurs within the group the relay will change state and will remain in the alarm condition until the associated input has returned to normal.
Page 45: Nex7250 Connection Details
14.1 Typical Panel mount wiring The example shown below is a typical system, all NEX designs are customer specified and come supplied with they’re own unique customer wiring diagram. Typical Customer connections to NEX7250 Panel mount Unit WIRING BY CUSTOMER...
Page 46: Typical Wall Mount Wiring
The pushbuttons are also mounted in the enclosure, with the option of an additional sounder and beacon mounted on the top of the unit. All NEX designs are customer specified and come supplied with their own unique customer wiring diagram. Typical Customer connections to NEX7250 Wall mount Unit DK4-R- 300R 14.3 Cable Entry...
Page 47: Large Window Alarm Module Wiring
NEX7250 Zone 2 Annunciator 15. Large Window Alarm Module wiring Series 725 units supplied with large windows provide one alarm per cell. In order to maximise the use of the standard two channel alarm card all odd cells within the annunciator, (1,3,5,7, etc), are equipped with alarm cards and all even cells, (2,4,6,8, etc), are left unequipped.
Page 48: Large Window Versions Fitted With An Odd Number Of Alarms
15.3 Large Window Versions Fitted With An Odd Number Of Alarms Series 725 units that use large windows and have an odd no of total alarms in the system, 1,3,5,7,9, ways etc, will be supplied with dual channel cards in alternative cells as described in the previous paragraph with the exception of the last cell which will be supplied for use as a single alarm cell only as detailed below.
Page 49: Medium Window Alarm Module Wiring
NEX7250 Zone 2 Annunciator 16. Medium Window Alarm Module Wiring Series 725 units supplied with medium windows provide two alarms per cell. 16.1 Standard Version Without Repeat Relay Facility Each cell is equipped with a type A2 back plate and a dual channel alarm card model no CB5674POP1, which is suitable for 2 signal inputs.
Page 50: Small Window Alarm Module Wiring
17. Small Window Alarm Module Wiring Series 725 units supplied with small windows provide four alarms per cell. 17.1 Standard Version Without Repeat Relay Facility Each cell is equipped with a type A4 back plate and two x dual channel alarm cards. Model no CB5674POP1 suitable for 2 signal inputs.
Page 51: Dual Repeat Relay Option
NEX7250 Zone 2 Annunciator 18. Dual Repeat Relay Option 18.1 Optional Version With Dual Repeat Relay Facility (Option RL2) Each cell is equipped with a type AR* back plate, a dual channel alarm card and a dual channel repeat relay card.
Page 52: Signal Supply Voltage Options
19. Signal Supply Voltage Options 19.1 Standard Systems With Combined Logic And Signal Supply. In standard systems the 24VDC logic supply, OV and +V is cross-linked to the signal supply input terminals, OVC and +VC to provide the voltage required to power the input contacts. Systems are supplied with a factory fitted jumper between these terminals.
Page 53: Standard Systems Using Externally Powered Inputs
NEX7250 Zone 2 Annunciator 19.2 Standard Systems Using Externally Powered Inputs 24VDC powered inputs. As an option systems can use externally generated signal supply voltage sources to power the inputs. If the externally generated signal supply voltage is 24VAC/DC then the standard annunciator can be used without modification.
Page 54: Systems Fitted With Serial Comm.'s
20. Systems Fitted With Serial Comm.’s Systems Fitted With the Serial Communications Option All NEX7250 units can be supplied with a bi directional serial output card and RS485 serial port, which can be used to transmit or receive serial alarm data to and from 3 party devices on a channel-by-channel basis or in master /slaves configurations between annunciators.
Page 55: System Configurations And Programming
CONFIGURATION PANEL Functions The NEX7250 alarm annunciator is always supplied with a comprehensive range of pre-defined options which can be enabled or disabled on a channel by channel basis using the integral, (or as an option remote), pushbutton / programming module. To simplify the configuration process each option has been allocated a unique “Function No.”...
Page 56: Changing A Function Setting
21.2 Changing A Function Setting When the pushbutton / programming module has been hinged down and the “CONF”, “programme mode”, switch has been placed to the ON position the operation of the pushbuttons changes as indicated on the information plate on the underside of the unit as detailed below:- Programming Information Plate Details FUNCTION CONF...
Page 57: Programming Example
NEX7250 Zone 2 Annunciator 21.3 Programming Example Example:- If channel 7 is currently set to manual reset but the user would like to change this to allow the window to automatically reset, (after acknowledge), the following procedure should be followed.
Page 58: Function No Key And Descriptions
22. Function No Key And Descriptions If units are supplied with unarmed alarm channels it is necessary to jump over these missing cards (addresses) to access the next channel. General Description The P725 is equipped with numerous pre-defined features that can be simply enabled or disabled on a per channel basis as required.
Page 59: Function Descriptions
NEX7250 Zone 2 Annunciator 23. Function Descriptions Function Numbers are used to describe pre-defined features that can be enabled or disabled by the Customer as required. F0- Contact Status Function F0 allows each window in the annunciator to be illuminated if the associated signal contact is in the closed state.
Page 60 F5- Ringback Sequence Ringback sequence is used to inform the operator that an acknowledged alarm has returned to normal. When an acknowledged alarm returns to normal the associated window will slow flash to indicate to the operator that the alarm can be reset. FEATURE-F5 STATUS LED Set channel to ringback not required...
Page 61 NEX7250 Zone 2 Annunciator F9- Non-Critical Group Relay Reflash Function Group relays are typically used to inform third party devices that there is an alarm within a local panel, however in the standard mode additional alarms occurring within the same group will not change the state of the relay if one alarm remains active.
Page 62 F14 - First-Up Group A All alarms set to function F14 will operate as a single first-up group in accordance with the selected first-up sequence. F14 is the function code allocated for first-up Group A. FEATURE-F14 STATUS LED Set to remove channel from first-up Group A Set to include channel in first-up Group A F15 - First-Up Group B All alarms set to function F15 will operate as a single first-up group in accordance with the selected...
Page 63 NEX7250 Zone 2 Annunciator F17 – Alarm Logic Selection (Standard version) On standard units that have the communications capability enabled there are only two first-up groups A and B. On these units Function 17 is used to configure how the communications operate.
Page 64 F20- Inhibit Group Repeat Relays On System Test If any channel in the system has been assigned to either the GPA or GPB relays using function F21 or F22 and system test is pressed the group relays will activate. However if function F20 is enabled the GPA and GPB relays cannot be triggered by system test.
Page 65: Alarm Card Address Settings
NEX7250 Zone 2 Annunciator 24. Alarm Card Address Settings Dual Channel Alarm Card Address And Output Drive Type Settings Before each card is placed within the annunciator a unique address No. has to be set using the switches located on DIL switch SW1, which allows the programming module to communicate and pass programming instructions to and from the associated alarm channels.
Page 66: Alarm Card Dil Switch Sw1 Address Settings 0 To 40
24.2 Alarm Card DIL Switch SW1 Address Settings 0 To 40 ADDRESS BINARY SW1-7 SW1-6 SW1-5 SW1-4 SW1-3 SW1-2 SW1-1 0000000 0000001 0000010 0000011 0000100 0000101 0000110 0000111 0001000 0001001 0001010 0001011 0001100 0001101 0001110 0001111 0010000 0010001 0010010 0010011 0010100 0010101 0010110...
Page 67: Alarm Card Dil Switch Sw1 Address Settings 41 To 80
NEX7250 Zone 2 Annunciator Alarm Card DIL Switch SW1 Address Settings 41 To 80 ADDRESS BINARY SW1-7 SW1-6 SW1-5 SW1-4 SW1-3 SW1-2 SW1-1 0101001 0101010 0101011 0101100 0101101 0101110 0101111 0110000 0110001 0110010 0110011 0110100 0110101 0110110 0110111 0111000 0111001...
Page 68: Alarm Card Dil Switch Sw1 Address Settings 81 To 120
Alarm Card DIL Switch SW1 Address Settings 81 To 120 ADDRESS BINARY SW1-7 SW1-6 SW1-5 SW1-4 SW1-3 SW1-2 SW1-1 1010001 1010010 1010011 1010100 1010101 1010110 1010111 1011000 1011001 1011010 1011011 1011100 1011101 1011110 1011111 1100000 1100001 1100010 1100011 1100100 1100101 1100110 1100111 1101000...
Page 69: Alarm Card Dil Switch Sw1 Address Settings 121 To 127
NEX7250 Zone 2 Annunciator Alarm Card DIL Switch SW1 Address Settings 121 To 127 ADDRESS BINARY SW1-7 SW1-6 SW1-5 SW1-4 SW1-3 SW1-2 SW1-1 1111001 1111010 1111011 1111100 1111101 1111110 1111111...
Page 70: Adjustable Response Times
25. Adjustable Response Times If specified at the time of ordering alarm cards can be supplied with single-turn potentiometers that allow the user to set the reponse time of each input. Option AD1= 5 – 50 ms Option AD2 = 20ms - 2 seconds Option AD3 = 5ms –...
Page 71: Systems With Serial Communications
Each annunciator is set with a unique address from 0 to 63, which allows up to 64 separate annunciators to be connected in a single RS485 multi-drop loop. RTK can also supply comprehensive alarm monitoring and logging software if required.
Page 72 ASCII or RTU modbus is selected. Software RTK Instruments can supply comprehensive monitoring software for use with the 725 Series alarm annunciator. This can be configured as an alarm/event management system with user generated custom displays to monitor plant wide system operation.
Page 73: Serial Communication Card
NEX7250 Zone 2 Annunciator 27. Serial Communication Card The series NEX7250 Alarm Annunciator can be fitted with a serial communications card, which will provide an RS485 port to connect to external equipment. A number of features on this card are DIL- switch selectable as described below.
Page 74 Address selection Each annunciator needs to have a node address selected. This must be between 0 and 63. It is this address that makes the annunciator unique and allows the external equipment to communicate to a defined annunciator within a multi-drop system. The required node address should be converted to a binary number to give the DIL switch settings with the least significant digit on S1 and the most significant on S6.
Page 75: Serial Communication Port
NEX7250 Zone 2 Annunciator 28. Serial Communication Port This section describes the process of reading from and writing data to a P725 slave annunciator, and also the different types of data interchange possible. The tables below show the standard message formats for data interchange, for both ASCII and RTU protocols.
Page 76 Write Request/Response Master write request and P725 slave write response, are the same. REGISTER ERROR START ADDRESS FUNCTION DATA STOP ADDRESS CHECK ASCII XXXX XXXX [CR] [LF] REGISTER ERROR START ADDRESS FUNCTION DATA STOP ADDRESS CHECK ELAPSED ELAPSED TIME 3 ½ TIME 3 ½...
Page 77 NEX7250 Zone 2 Annunciator Channel Data The following table shows the name, function, and relative position of data bits in the data field for a read response or write request of alarm channel data. DATA LOWEST WORD Input state First up...
Page 78 Control Functions - (Pushbuttons) All the control functions with the exception of sleep and lamp test can be written to or read from the P725 slave. The following table shows the name, function, and relative position of data bits in the data field for a read response or write request of pushbutton data.
Page 79: Systems Linked To
63 separate annunciators can be connected to a single communication network to allow remote monitoring by 3 party equipment. in addition to the annunciation RTK can also supply suitable alarm management software pre-installed onto a single computer or as part of a complete plant wide alarm management system.
Page 80: P725 To P725 Serial Links
30. P725 to P725 Serial Links Local And Remote Systems Linked Via Communications In applications that require local panel alarms to be duplicated or summarised in central control rooms or monitoring stations the P725 can be supplied with a communications option which allows RS485 communication using Modbus protocol as standard between units.
Page 81: Commissioning
NEX7250 Zone 2 Annunciator 31. Commissioning A qualified technician properly trained and authorised to work with this type of equipment should carry out commissioning and servicing operations. The following procedure is a summary of the steps normally taken when installing an alarm system. This is the absolute minimum requirement and will generally be supplemented by a number of additional checks relating to the particular application and installation.
Page 82: Maintenance
32. Maintenance PLEASE NOTE WHEN INSTALLED UNIT MUST BE DE-ENERGISED BEFORE ANY MAINTAINACE IS UNDERTAKEN 32.1 No Special Tools All normal maintenance and programming is carried out from the front of the annunciator without the use of special tools. Filter and film legend changes and lamp and LED replacement are all undertaken by unclipping the front filter assembly.
Page 83: Spare Parts Description
NEX7250 Zone 2 Annunciator 33. Spare Parts Description Alarm Card Types There are 4 basic types of dual channel alarm cards PART NO DESCRIPTION USED ON Large, Medium and Small window versions CB5674POP1 2 Channel alarm card Located in the upper slot of the cell...
Page 84 Communications Card Current Version PART NO DESCRIPTION USED ON Replaced the original CB4468POP1 card in plastic CB6357POP1 Communications card version annunciator cabinets from Dec 2006 onwards Older Version PART NO DESCRIPTION USED ON CB4468POP1 Communication card Earlier version communication card Pushbutton Assembly Part no P725-TAR LED version...
Page 85: Other Rtk Products
NEX7250 Zone 2 Annunciator 34. Other RTK Products RTK Instruments Ltd is fully ISO9001:2000 approved and manufactures a comprehensive range of complementary products from our factory in Knaresborough, UK for use in the Industrial Control and Instrumentation field as per the summary list provided below.
Page 86: Ec Declaration Of Conformity
35. EC Declaration of Conformity This is to certify that the NEX7250 Alarm Annunciator Manufactured by:- RTK INSTRUMENTS LTD ST JAMES BUSINESS PARK KNARESBOROUGH NORTH YORKSHIRE HG5 8PJ Conforms to the protection requirements of the following directives: Council directive 89/336/EEC (EMC Directive) to BS EN 61000-6-4 and BS EN 61000-6-2 •...
Page 87 NEX7250 Zone 2 Annunciator Function Setting per Alarm Sequence FUNCTION STD ISA SEQUENCES FIRST-UP ISA SEQUENCES FEATURE STATUS NUMBER DESCRIPTION F2M-1 FFAM2 ONLY Manual / Automatic Reset Lock In / Non Lock In Ringback Sequence 2 Pushbutton Operation First Up Seq. FO ** Set To On For Slow Flash First Up Seq.