RTK NEX7250 Manual Download

Page: 12 / 87

A certification label must also be present on the front of the unit as shown below:

Certificate No: RTK08ATEX0222X

WARNING: POTENTIAL ELECTROSTATIC DISCHARGING
HAZARD - SEE INSTRUCTIONSS

Serial No: SP829-XXXXX

NEX7250 ZONE 2 ALARM ANNUNCIATOR

II 3 G Ex nA [nL] IIC T4 -20°C<Ta< +50°C

KNARESBOROUGH UK.

INSTRUMENTS

Ui=24V, Ii=45mA, Pi=1.3W

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.

Summary of Contents for NEX7250

Page 1: ...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 AUTHOR APPROVED 0 26 6...

Page 2: ...atented feature It must not be reproduced in whole or in part or used for tendering or manufacturing purposes except under an agreement or with the consent in writing of RTK Instruments Ltd and then o...

Page 3: ...11 Sleep Mode 16 5 12 Automatic Mute Or Automatic Acknowledge 17 5 13 Integral Audible Alarm 18 5 14 Remote Pushbutton Inputs 19 5 15 Terminations 20 5 16 Failsafe Mode 20 6 INPUTS 21 6 1 Optically Co...

Page 4: ...n DHN 42 13 9 Supply Input Output Module Option SI O 43 13 10 RS485 Serial Communications Option COM Part No CB6357POP1 43 13 11 Individual Channel Repeat Relays Powered By The Field Contact Voltage O...

Page 5: ...7 21 6 Points To Note When Programming 57 22 FUNCTION NO KEY AND DESCRIPTIONS 58 23 FUNCTION DESCRIPTIONS 59 24 ALARM CARD ADDRESS SETTINGS 65 24 1 Set Output Drive To Operate With LED 65 24 2 Alarm C...

Page 6: ...ule which allows changes to be easily made during commissioning or at a later date after the equipment has been installed Large and medium window version alarm cards are fully interchangeable within t...

Page 7: ...ed or when inserting the cable glands 2 All external earthing should use 4mm cable as a minimum 3 Any fuses used will be marked with a label giving type and rating Fuses should not be replaced with th...

Page 8: ...Y FIELD PROGR MOTOR 1 HIGH TEMP LASER PRINTED FILM LEGENDS OPTIONAL SERIAL INTERFACE CARD MOTOR 2 HIGH TEMP LAMP TEST PLC FAILURE GAS PRESSURE LOW Small Window Version SIX WINDOW COLOURS MEDIUM WINDOW...

Page 9: ...size of this enclosure is depended on the cell size of the annunciator as long as the box doesn t exceed the maximum size stated on the certificate Layout of panel mount box This type of NEX7250 allo...

Page 10: ...cation 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...

Page 11: ...us relays all safety parameters Ui 24V Ii 45mA Pi 1 3W Ci 0 Ii 0 IEC60079 0 gives additional information the marking shall also include The year in which the equipment was constructed Specific marking...

Page 12: ...RGING HAZARD SEE INSTRUCTIONSS Serial No SP829 XXXXX NEX7250 ZONE 2 ALARM ANNUNCIATOR II 3 G Ex nA nL IIC T4 20 C Ta 50 C KNARESBOROUGH UK INSTRUMENTS _ _ Ui 24V Ii 45mA Pi 1 3W 4 9 Documentation All...

Page 13: ...mm SMALL WINDOW VERSION 30 X 30 mm 5 2 Window Colours Each channel is equipped with its own removable lens assembly which contains a white diffuser coloured filter and a laser printed film legend Par...

Page 14: ...has a small slot in the upper ridge of the surround bezel which allows a flat blade terminal screwdriver to be used to gently lever the assembly forward Once the assembly has been removed the diffuser...

Page 15: ...ocates in the upper slot of the associated cell CB5674POP2 2 Channel alarm card With repeat relay facility Large medium and small window versions Locates in the upper slot of the associated cell CB567...

Page 16: ...and audible outputs are disabled during unmanned periods to reduce the drain on the associated station batteries Whilst in sleep mode the logic of the annunciator will continue to react in the normal...

Page 17: ...delay To set the automatic mute or acknowledge feature the pushbutton programming module must be hinged down by inserting a small flat blade screw driver into the recess on the upper face of the asso...

Page 18: ...ith an internal 3 5kHz 95dB A audible located behind the integral pushbutton module The audible is supplied with an adjustable volume control using a single turn potentiometer The potentiometer can be...

Page 19: ...ed in the operator desk console The Pushbuttons should be of the Normally Open Momentary type and it is recommended that if long cable runs are required through electrically noisy environments a scree...

Page 20: ...ck disconnect 2 part pluggable rising clamp terminals capable of accepting up to 2 5mm cable In the unlikely event that a card fails the associated field wiring can remain connected and the terminal t...

Page 21: ...1 to the off state conditions the input to accept a normally open contact Setting function F1 to the on state conditions the input to accept a normally closed contact 6 3 Signal Supply Voltage On stan...

Page 22: ...ore advisable to run the contact cables separately from circuits carrying heavy currents and or high voltages to minimise the affects of induced voltages 6 6 No Master Module Each dual channel alarm c...

Page 23: ...the relay card must be removed from the system as described below 1 Remove Power From the annunciator 2 Remove the two green terminal blocks which provide customer terminations on the rear of the push...

Page 24: ...AY LK6 LK2 LK8 LK7 LK9 N O LK1 N C N O N C N O N C 7 2 Critical Horn Relay HNA When an alarm occurs the horn relay will change state and remain in the alarm condition until the mute or ack pushbutton...

Page 25: ...state and if reflash is set any subsequent alarm occurring in the same group will cause the relay to drop out for 0 5 seconds Each channel can be set to reflash the non critical group relay as requir...

Page 26: ...Individual channel Repeat relay option Each alarm can be supplied with an individual repeat relay with a changeover contact rated 2A 24VDC Communication option The unit can be supplied with RS485 bi...

Page 27: ...ects the signal supply voltage feed to the common C terminals 8 3 Suitable Power Supplies The table below indicates the maximum numbers of alarm channels that can be connected to a standard power supp...

Page 28: ...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 Once the unit has been pl...

Page 29: ...e state of the associated window in accordance with the selected sequence Reset will return the alarm to the normal off state only if the unit has been acknowledged and the associated alarm contact ha...

Page 30: ...alarm if the contacts are in the alarm condition and to reset it if the contacts are clear 11 6 First Up Sequences When monitoring devices with interlinked functions such as a turbine or compressor it...

Page 31: ...NORMAL OFF SILENT 2 ABNORMAL ALARM FLASHING AUDIBLE LOCK IN 3 ABNORMAL OR NORMAL ACKNOWLEDGE ACKNOWLEDGED ON SILENT MANUAL RESET REQUIRED 4A ABNORMAL RESET TO LINE 3 4B NORMAL RESET NORMAL OFF SILENT...

Page 32: ...ACKNOWLEDGE AND TEST PUSHBUTTONS 2 ALARM AUDIBLE DEVICE 3 LOCK IN OF MOMENTARY ALARMS UNTIL ACKNOWLEDGED 4 THE AUDIBLE DEVICE IS SILENCED AND FLASHING STOPS WHEN ACKNOWLEDGED 5 AUTOMATIC RESET OF ACKN...

Page 33: ...QUENCE FEATURES 1 ACKNOWLEDGE AND TEST PUSHBUTTONS 2 ALARM AUDIBLE DEVICE 3 NON LOCK IN OF MOMENTARY ALARMS 4 THE AUDIBLE DEVICE IS SILENCED AND FLASHING STOPS WHEN ACKNOWLEDGED 5 AUTOMATIC RESET OF A...

Page 34: ...AL PR OC ESS A UD IB LE PR OC ESS VISU AL SLOW FLA SHIN G R IN GB AC K R ESET TO A B NO R M AL A C KN OW LED GE W H ILE NO RM AL R ETU RN TO AB NO R M AL VISUA L PRO CESS OFF N OR M A L SILEN T A U DI...

Page 35: ...NUAL RESET SEQUENCE FEATURES 1 ACKNOWLEDGE RESET AND TEST PUSHBUTTONS 2 ALARM AUDIBLE DEVICE OPTIONAL RINGBACK AUDIBLE DEVICE 3 LOCK IN OF MOMENTARY ALARMS UNTIL ACKNOWLEDGED 4 THE AUDIBLE DEVICE IS S...

Page 36: ...ST ALARM ONLY NO LOCK IN OF MOMENTARY SUBSEQUENT ALARMS 4 FLASHING AND AUDIBLE INDICATIONS FOR FIRST ALARM ONLY NEW SUBSEQEUNT ALARMS GO TO THE ACKNOWLEDGE STATE 5 FIRST OUT INDICATION IS RESET AND TH...

Page 37: ...IRST OUT RESET VISUAL PROCESS SILENT FLASHING FIRST SILENCED SILENCE ACKNOWLEDGE FIRST OUT RESET SILENT ACKNOWLEDGED ON AUDIBLE AUDIBLE VISUAL ON PROCESS AUDIBLE FLASHING ABNORMAL SILENCE PROCESS RESE...

Page 38: ...RESET REQUIRED 8 FIRST ABNORMAL OR NORMAL ACKNOWLEDGE AFTER SILENCE TO LINE 7 FIRST OUT RESET 9 NORMAL RESET NORMAL OFF SILENT MANUAL RESET SEQUENCE FEATURES 1 SILENCE ACKNOWLEDGE RESET AND TEST PUSH...

Page 39: ...LOW FLASHING ABNORMAL AUDIBLE AUDIBLE INTERMITTENT FLASHING FIRST ALARM FIRST OUT RESET SUBSEQUENT ACKNOWLEDGE ON ABNORMAL VISUAL AUDIBLE PROCESS STATE SEQUENCE VISUAL PROCESS ON SUBSEQUENT ALARM ABNO...

Page 40: ...ORMAL TO LINE 8 MOMENTARY ALARM 7A FIRST ABNORMAL FIRST OUT RESET AFTER ACKNOWLEDGE TO LINE 6A FIRST OUT RESET 7B FIRST NORMAL TO LINE 8 FIRST OUT RESET 8 NORMAL NORMAL OFF SILENT AUTOMATIC RESET SEQU...

Page 41: ...Option TRO In harsh environmental conditions all of the associated cards are sprayed with a conformal coating and sealed relays are used as required 13 4 Individual Channel Repeat Relays Option RLY As...

Page 42: ...ilable on systems using medium or large windows 13 6 Customer Specified Response Time Option CRT The response time for standard units is factory set at 25ms If alternative response times are required...

Page 43: ...e Option RAV Option RAV is used in safety critical applications to power the individual channel repeat relays using the field contact supply voltage In this mode even if the annunciator logic supply i...

Page 44: ...contact 13 17 Total Group Relay Option RTG Option RTG is used in applications that require two common alarm groups GPA and GPB PLUS a total group relay The multi function relay MUL located in the SPR...

Page 45: ...mount Unit 1 1 2 3 4 5 6 7 8 9 10 A R ST M FR PUSHBUTTONS E 4 8 10 9 6 7 5 3 2 1 EARTH TERMINAL CONNECTS TO MOUNTING PLATE L V CUSTOMER INCOMING SUPPLY 24V DC PSU N 0V 0VC COMMON RLY 4 8 10 9 6 7 5 MU...

Page 46: ...STOMER FIELD CABLE TRUNKING ANNUNCIATOR CABLE TRUNKING CUSTOMER 24V DC SUPPLY CUSTOMER INPUTS COMMON RELAYS DK4 R 300R 14 3 Cable Entry The enclosure gland plate is located on the bottom of the unit T...

Page 47: ...and a dual channel alarm card model no CB5674POP1 which is suitable for 2 signal inputs The alarm card is located in the upper card slot 15 2 Optional Unit With Repeat Relay Facility Each cell is equi...

Page 48: ...suitable for 2 signal inputs The alarm card is located in the upper card slot Note Only 1 channel is used in this configuration 15 5 Optional Unit With Repeat Relay Facility Each cell is equipped wit...

Page 49: ...n With Repeat Relay Facility Each cell is equipped with a type AR2 back plate and dual channel alarm card model no CB5674POP2 which is suitable for 2 signal inputs and provides 2 relay outputs each ha...

Page 50: ...Facility Each cell is equipped with a type AR4 back pate and two x dual channel alarm cards Model no CB5674POP2 suitable for 2 signal Inputs and equipped with 2 relay outputs each having one set of ch...

Page 51: ...relay card Relay contacts R1 and R1A operate in conjunction with channel 1 Relay contacts R2 and R2A operate in conjunction with channel 2 Please note relays R1A R2A follow the functions set for rela...

Page 52: ...4VDC Via a fuse to all of the common terminals within the annunciator marked C ready for connection to customer signal contacts Systems Using A Single 24VDC For Logic And Signal Supply FR MULT SUPPLY...

Page 53: ...ould be connected to signal supply input terminals OVC and VC to distribute the voltage required to power the input contacts VC is used to internally link the externally generated signal supply voltag...

Page 54: ...line and one end of the outer screen should be taken to an instrument earth It is also recommended that the communication cable is run in separate trunking to cables carrying high current or high volt...

Page 55: ...but care must be taken to ensure the operating modes selected do not conflict with each other For example if ringback alarm sequence R is required the system should also be set to manual reset for th...

Page 56: ...ogramming will fast flash 1 The lamp test system test pushbuttons are used to select the required channel 2 The reset first reset pushbuttons are used to select the required Function No 3 The ack mute...

Page 57: ...e status information The status LED on the information plate can be used as an alternative to view the setting for this channel if the status LED is on the function has been enabled or the user can mo...

Page 58: ...up relay F8 Disable Enable Reflash non critical group relay F9 Disable Enable Set alarm to first up sequence F0 F10 Disable Enable Set alarm to first up sequence F1 F11 Disable Enable Set alarm to fir...

Page 59: ...Y are fitted to the annunciator FEATURE F2 STATUS LED Set individual channel repeat relay to be normally energised in non alarm state OFF Set individual channel repeat relay to be normally de energise...

Page 60: ...o operate independently OFF Set channel to allow the reset pushbutton to be used for acknowledge reset ON F7 Input Reflash Re Alarm On Manual Reset Sequences Input reflash is used to inform the operat...

Page 61: ...channel to first up sequence FO not required OFF Set channel to first up sequence FO required ON Please note F10 is used to enable slow flash for non first up sequences F11 First Up Sequence F1 This...

Page 62: ...ications capability enabled there are only two first up groups A and B On these units Function 16 is used to configure how the communications operate With the communications option fitted it is possib...

Page 63: ...state until the alarm has returned to normal and the associated pushbuttons have been pressed Please note The individual relay is activated by the alarm logic or when system test is pressed See functi...

Page 64: ...lay using function F22 When set the alarm channel will activate the group relay when an alarm occurs and relay will remain active until the alarm has returned to normal and the channel has been acknow...

Page 65: ...sociated alarm channels When replacing an alarm card the switches on DIL Switch SW1 must be set to match the card that is being removed SW1 FUNCTION ON OFF SW1 1 Set address Bit 1 1 0 SW1 2 Set addres...

Page 66: ...ON ON 16 0010000 OFF OFF ON OFF OFF OFF OFF 17 0010001 OFF OFF ON OFF OFF OFF ON 18 0010010 OFF OFF ON OFF OFF ON OFF 19 0010011 OFF OFF ON OFF OFF ON ON 20 0010100 OFF OFF ON OFF ON OFF OFF 21 00101...

Page 67: ...56 0111000 OFF ON ON ON OFF OFF OFF 57 0111001 OFF ON ON ON OFF OFF ON 58 0111010 OFF ON ON ON OFF ON OFF 59 0111011 OFF ON ON ON OFF ON ON 60 0111100 OFF ON ON ON ON OFF OFF 61 0111101 OFF ON ON ON O...

Page 68: ...F OFF OFF OFF OFF 97 1100001 ON ON OFF OFF OFF OFF ON 98 1100010 ON ON OFF OFF OFF ON OFF 99 1100011 ON ON OFF OFF OFF ON ON 100 1100100 ON ON OFF OFF ON OFF OFF 101 1100101 ON ON OFF OFF ON OFF ON 10...

Page 69: ...8 4 2 1 NO BINARY SW1 7 SW1 6 SW1 5 SW1 4 SW1 3 SW1 2 SW1 1 121 1111001 ON ON ON ON OFF OFF ON 122 1111010 ON ON ON ON OFF ON OFF 123 1111011 ON ON ON ON OFF ON ON 124 1111100 ON ON ON ON ON OFF OFF...

Page 70: ...5 OFF 3 2 1 ALARM CARD DELAY RL1 A4506 VR1 VR2 DELAY CH1 CH2 RESPONSE TIME ADJUSTMENT To access the individual alarm card the plastic cover plate on the rear of the associated cell must be removed by...

Page 71: ...nnunciator 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 an...

Page 72: ...re specialised manuals A brief overview of the main features is shown below Modbus Function Codes The function code field tells the addressed slaves what function to perform The only relevant function...

Page 73: ...witches On Communications Card SW1 FUNCTION ON OFF SW1 1 Address bit 1 1 0 SW1 2 Address bit 2 1 0 SW1 3 Address bit 3 1 0 SW1 4 Address bit 4 1 0 SW1 5 Address bit 5 1 0 SW1 6 Address bit 6 1 0 SW1 7...

Page 74: ...if this feature is enabled Selection The table below indicates additional communication parameters that are available for configuration by the user All switches are set to off in the default condition...

Page 75: ...d with 1start bit 1parity bit and 1 stop bit RTU tables Each character represents 8 bit binary data in hexadecimal format Y represents a character with more than one possible value All characters are...

Page 76: ...ata 2 3 Data 255 256 Data 256 Pushbutton Data Data The data field uses 16 bits The information it contains is dependent on the type of data interchange being performed i e read or write register addre...

Page 77: ...t Up BIT 1 If this bit is set to one then this channel is a first up alarm If multiple first up groups are used it will be possible to have multiple first up alarms The serial communications transmits...

Page 78: ...st 1 0 1 Mute 1 1 1 Read of multiple channels In applications where you need to read or write the status of the input channel without any information on the full alarm status it is possible to transmi...

Page 79: ...r always operates as a slave device and it is therefore only able to read and write following requests from the master device Various parameters of the communications are user configurable using DIL s...

Page 80: ...omatically equipped with integral watchdog relays which will change state if any errors in the internal or external communication are detected In larger schemes multiple remote P725 Annunciators each...

Page 81: ...faults 2 Ensure the annunciator has been correctly earthed using appropriate sized cable 3 Check that all customers wiring added during installation is secure and correctly wired 4 Apply a 24vdc logic...

Page 82: ...a simple matter to remove the faulty LED s The LED assemblies are removed and replaced in exactly the same way accept that the glass wedge is replaced with a small PCB connecting tag The LED s are not...

Page 83: ...ed in the upper slot of the cell CB5674POP7 2 Channel alarm card with 4 x first up groups Large Medium and Small window versions Located in the lower slot of the cell CB5674POP8 2 Channel alarm card w...

Page 84: ...card in plastic version annunciator cabinets from Dec 2006 onwards Older Version PART NO DESCRIPTION USED ON CB4468POP1 Communication card Earlier version communication card Pushbutton Assembly Part...

Page 85: ...recorder Alarm management systems Programmable remote logic alarm systems Hazardous area alarm systems Trip amplifiers Trip monitoring systems Signal isolators Multi output isolators Signal converters...

Page 86: ...s Council directive 89 336 EEC EMC Directive to BS EN 61000 6 4 and BS EN 61000 6 2 Council Directive 94 9 EC ATEX Directive to EN60079 0 and EN60079 15 The product is certified to II 3 G Ex nA nL IIC...

Page 87: ...F OFF OFF OFF ON OFF OFF OFF F13 First Up Seq F3 Set To On For Fast Flash OFF OFF ON ON OFF F14 First Up Group A OFF OFF OFF OFF When using First Up sequences Functions F14 to F17 allow the user to li...

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