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3.3.5 TRANSDUCER BRIDGE INPUT

A transducer bridge requires two sets of connections. A power supply and bridge
output. The bridge output is treated as a millivolts signal and connected between pins
4 and 5 as in the diagram below.

Note that the power supply could be from the units bridge excitation output option or
an external power supply.

INSTALLATION

SENSOR CONNECTIONS

Page 16

Summary of Contents for DM4000U

Page 1: ...amage injury loss or expense resulting from errors or omissions and reserve the right of amendment without notice This document is issued by Status Instruments Ltd and may not be reproduced in any way without the prior written permission of the company 52 314 2063 03 DM4000U SMART INDICATOR August 2003 Page 1 ...

Page 2: ...TALLATION 3 0 WIRING 7 24 USER GUIDE 4 0 PROGRAMMING 25 67 5 0 OPERATION 68 73 Appendix A FITTING OF LEGEND ID 74 Appendix B SPECIFICATION 75 79 Appendix C TROUBLESHOOTING 80 81 Appendix D MAINTENANCE 82 Appendix E USER COMMUNICATION SOFTWARE 83 92 Index 93 94 Page 2 ...

Page 3: ...GETTING STARTED Page 3 ...

Page 4: ...ide range of input types A great advantage with this unit is its ability to adapt to a wide variety of applications A comprehensive set of programming menus allow the instrument to be entirely re configured from the keypad The diagram below identifies features on the front panel Page 4 ...

Page 5: ...the user may fit a range of options including relays current re transmission and voltage output boards In addition there is also a communications board slot allowing up to 30 units to be directly networked together to a host computer A schematic of the unit showing internal power supplies and possible options is shown below Page 5 ...

Page 6: ...uarantee that undue mishandling will not have damaged the instrument In the case of this unlikely event please contact your supplier immediately and retain the packaging for our subsequent inspection Check that the following items are included with the instrument Note that if there are output options included there will be additional connectors Page 6 SG4 2069 04 ...

Page 7: ...INSTALLATION Page 7 ...

Page 8: ...s and between inputs and communications where fitted Any terminals or wiring connected to the input output or communications terminals which are accessible in normal operation must ONLY be connected to signals complying with the requirements for Safety extra low voltage SELV circuits WARNING If not installed in accordance with these instructions protection against hazards may be impaired Installat...

Page 9: ...rear A gasket is available and should be fitted wherever sealing of the instrument is required See diagram below The maximum panel thickness is 3 5mm with a gasket and 4 5mm without The gasket has a self adhesive side which should be stuck to the panel around the cutout The instrument may then be inserted and tightened against the gasket to form a seal The panel should be clean and smooth for the ...

Page 10: ... Control Systems Installation design and practice See important safety information on page 8 3 1 POWER SUPPLY The Power supply rating will be indicated on the top of the instrument Ensure that this is correct for the voltage that is to be connected If there is a difference refer to Service Manual for details of power supply adjustment Note that the power supply socket has had polarisation keys fit...

Page 11: ...or control wiring in the same loom as sensor wires Check power supply voltage is the same as printed on the label attached to the unit Check wires especially the power supply voltage wires are not loose before switching on the unit Use screened cable for sensor wiring with the screen earthed at one end only Follow the wiring instructions in this manual 3 3 SENSOR CONNECTIONS All sensor connections...

Page 12: ...00mV it is connected to the millivolts input If the signal is less than 10 volts but greater than 100mV it is connected to the Voltage input Any voltages greater then 10 volts may still be measured but must be divided down first Each of these cases is discussed in more detail below 3 3 1 1 MILLIVOLTS INPUT This input accepts signals up to 100mV in normal operation The signal source must be connect...

Page 13: ...tage to a nominal maximum of 10volts This is done using a resistor divider chain as shown in the diagram below The choice of resistors are given as the nearest preferred values to those calculated in the equations for R1 and R2 below It is possible to correct for any errors in the divide down chain by making R2 a trimmer or correct by adjustment of scale range Care must be taken to insulate any hi...

Page 14: ... In order to measure the current in an externally generated loop it is necessary to insert a resistor in circuit and use the instrument to measure the resultant voltage drop Note that the instrument will need to be configured as a 1 5V input and not a 4 20mA input this is described later in the programming section The diagram shows the necessary connections 3 2 2 2 CURRENT MEASUREMENT OF AN INTERN...

Page 15: ...ice 3 3 4 Pt100 RESISTANCE TEMPERATURE DETECTORS RTDs These detectors are for platinum resistance inputs Pt100 to BS1904 or DIN 43760 three wire RTDs should be connected using three identical wires in order that measurement errors due to lead wire resistances can be eliminated The connections should be made as shown in the diagram opposite If it is necessary to use a two wire sensor then it should...

Page 16: ...er supply and bridge output The bridge output is treated as a millivolts signal and connected between pins 4 and 5 as in the diagram below Note that the power supply could be from the units bridge excitation output option or an external power supply INSTALLATION SENSOR CONNECTIONS Page 16 ...

Page 17: ...e or Current is that although there is 500V isolation from the Input there is no isolation between output slots See safety information on page 8 3 4 1 RELAY OUTPUTS option 1 and 2 There are two types of relay outputs available Dual relay and Change Over relay The dual relay board has two independent contacts sharing the same common The Change over relay has a single contact with a Normally Open an...

Page 18: ...act states both these types of relays are summarised in the table below If the current to be switched is very low 100mA the varistors on the relay board may need to be removed RELAY OUTPUT INSTALLATION Page 18 ...

Page 19: ...e shown in the diagrams below Note that connecting directly across pins 1 3 may cause damage to the output card The instrument may be used as a voltage output by connecting a suitable resistor between pins 1 and 2 For example by placing a 250 ohm resistor across pins 1 and 2 and setting the output board to 4 20mA the voltage output will produce a voltage between 1 and 5 volts CURRENT OUTPUT INSTAL...

Page 20: ...age Output Bridge Excitation option 04 There are two options Either a programmable 2 to 20 volt output or a fixed 24 volt output The connections for both cases are shown below INSTALLATION VOLTAGE OUTPUT Page 20 ...

Page 21: ...ctrical communications standard RS485 is used instead of the commonly available RS232 as its robustness is more suitable for process instrumentation The Comms board is fitted in its own dedicated slot accessible from the rear of the instrument as identified below Although RS485 is the recommended interface RS232 has been found to operate COMMUNICATIONS INSTALLATION RX TX SIGGND 2 3 5 1 6 7 8 DCD D...

Page 22: ...tions between the instrument and a Host PC The Tx and Rx signals are both differential therefore they should be twisted wires for best operation over long distances For multidrop operation the instruments should be connected as shown below INSTALLATION COMMUNICATIONS 1 2 3 4 5 6 7 8 GND EN TX B TX A RX A RX B GND LINK 5 TO 13V DC Amplicon Liveline Model 485F25 1 2 3 4 5 485 CARD SMART INDICATOR VD...

Page 23: ...installed in a very noisy electrical environment The screen should be grounded at one point only 3 4 2 LINE TERMINATION Termination resistors should be put on the receive inputs of the Host PC and the instrument furthest away from it This is shown schematically above The instrument has a 100 ohm termination on the comms board which may be connected in circuit by moving a user selectable link The n...

Page 24: ...S485 has a drive limitation of 32 receivers If additional instruments are required there is a logical maximum of 99 units it is necessary to buffer the Host PC transmitter as shown in the diagram below 3 5 4 GROUNDING PROBLEMS Each instrument has an internal link which connects the comms 0v to unit ground If this causes any problems it may be removed Warning Do not remove the Earth strap from the ...

Page 25: ...USER GUIDE Page 25 ...

Page 26: ...chematically the operation of the instrument The programming of the instrument is central to its operation effecting the way the inputs are processed how the outputs are handled and what is displayed This section is divided into two parts the first is a tutorial guide to show how to use the programming menus the second documents the complete menu contents PROGRAMMING TUTORIAL Page 26 ...

Page 27: ... here the Process Variable is displayed and all other modes are accessed The unit will always time out back to this mode from any other mode of operation THE MENU MODE gives the user access to the programmable parameters within the unit It is called a Menu Mode because the parameters are arranged in lists according to their type THE EDIT MODE is entered into from the Menu Mode and allows the user ...

Page 28: ...e black symbols indicate the keys to press Shaded keys indicate that the keys should pressed simultaneously 4 1 2 GETTING INTO MENU MODE The Menu mode is accessed from the Display PV mode by pressing the following sequence of keys The display will now show SETPt In order to understand what this means the following diagram shows where we are within the basic or Root menu structure TUTORIAL PROGRAMM...

Page 29: ...on wraps around to the start This principle of menu operation is applied throughout the system 4 1 2 2 GETTING INTO A SUBMENU Up to now we have simply moved within the Root menu in order to get into a submenu we must first cycle around the Root menu until the required submenu is displayed For the purposes of this tutorial press the CYCLE key until InPut is displayed In order to get into the INPUT ...

Page 30: ...on to other items in the menu As before pressing the CYCLE moves the menu position from left to right wrapping around at the end Do not worry if the contents of the menu as shown above is not exactly as you find the unit alters items in the menu list depending upon settings made TUTORIAL PROGRAMMING Page 30 ...

Page 31: ...a flashing display The display shows the contents of the parameter being edited The flashing entry is most likely to be currnt This means that the Input sensor type was previously set to monitor current inputs This item is changed by pressing the INC key The choice of options available will be found to be as follows INCrement the edit options around until Volts is displayed flashing Note that whil...

Page 32: ...s a bit different though as easy as for any other entry As before we will see it through an example Cycle around the Inputs menu until Hi is displayed This is the engineering high range value although its function is unimportant in the tutorial it simply provides a numeric field to edit As before pressing SHIFT takes us into the edit mode The value on the display will have its most significant dig...

Page 33: ...nstead we shall return to the Root menu and then back to the DISPLAY PV mode 4 1 4 RETURNING FROM SUBMENUS It has been shown that the method of getting into a submenu is pressing the SHIFT key on a submenu item The reverse operation is to press the ESCAPE key This may be done anywhere in a menu Pressing the ESCAPE key from our current position in the Inputs menu takes us back to the Root menu OUtP...

Page 34: ...ogram mode is entered by pressing ENTER then CYCLE from the process variable display This takes the system into the Root menu The Root menu is divided into five submenus SETPOINTS INPUTS OUTPUTS SYSTEM and CALIBRATION Note If there are analog output options fitted Current output or Voltage output in both output slot positions there will not be any setpoints available and the SETPOINT submenu will ...

Page 35: ...put submenu section With this in mind it should be taken that any or all of the setpoints 1 to 4 could be unavailable and therefore removed from the submenu If all setpoints are unavailable then the entire submenu is occulted The submenu is represented as follows In each case the editable value is the setpoint in engineering units The number of decimal places for this field is defined by rES in th...

Page 36: ...may effect items further down Therefore during programming the user should start at the top of the menu and work down to avoid setting an option which may later become obsolete For instance if a temperature sensor is selected then there is no requirement to select the engineering range The structure of the Input menu is represented in the following diagram INPUT MENU PROGRAMMING Page 36 ...

Page 37: ...een set to either current or voltage The options available will vary between these two settings 4 2 2 2 1 rANgE SENSOr currnt If the sensor type has been set to current the following options are available 4 20 Internally generated 4 20mA 0 20 Internally generated 0 20mA 0 10 Internally generated 0 10mA default setting 4 20 4 2 2 2 2 rANgE SENSOr VOLtS If the sensor type has been set to voltage the...

Page 38: ... E E type thermocouple F F type thermocouple n N type thermocouple b B type thermocouple Default setting CA 4 2 2 4 UnitS Temperature sensor units This item is only available if a temperature sensor has been selected that is either a thermocouple or an RTD The two options are dEg C Degrees Centigrade dEg F Degrees Fahrenheit Switching between these two has the effect of changing the engineering ra...

Page 39: ... number of significant figures must fit within this field If there are more significant digits than can be displayed the number will be right justified default setting 888 8 One place of decimal 4 2 2 6 CJ Cold Junction Select This is only shown if thermocouple has been selected as input type This entry provides choice of cold juction compensation between a internal thermistor measuring the actual...

Page 40: ...increase from 0 to 100 Similarly as the millivolts reduce from 0 to 100 the Rate falls from 0 0 to 50 0 This relationship is shown on the following diagram On all ranges a 7 overhead is allowed on the scale before the unit detects an out of range signal If the input signal is out of range at the positive end of the scale OVEr is displayed instead of the Process Variable If out of range at the nega...

Page 41: ...temperature sensor is detected to be open circuit the burnout comes into operation forcing the Process Variable up scale or down scale burn is shown on the display in place of the Process Variable display The options are Hi High scale burnout Lo Low scale burnout default setting Hi The factors which can cause a burnout error are any of the following Thermocouple open circuit Cold junction thermist...

Page 42: ...ter factors represent the time it would take a step change in an input value to reach approximately 63 of its final value The following filter factors are available nonE Filtering switched off 0 5 SEC Filter Factor 0 5 seconds 1 SEC Filter Factor 1 second 2 SEC Filter Factor 2 seconds 4 SEC Filter Factor 4 seconds 8 SEC Filter Factor 8 seconds 16 SEC Filter Factor 16 seconds INPUT MENU PROGRAMMING...

Page 43: ...er noisy signals The diagram below shows the operation of the Jumpout on a filtered input Each of the waveforms is based upon the same raw input A By setting the Jumpout band just greater than the noise level the filtering is switched off for any change in actual signal In this way a compromise between heavy filtering and signal response can be reached The following options are available nonE No j...

Page 44: ...oltage ranges This feature is available for Voltage and Current inputs only and enables the user to specify one of the following input characteristics This characteristic is then applied to the Raw input The five options are LinEAr Linear relationship no conditioning USEr User defined characteristic See 4 2 2 13 S root Square root Law See 4 2 2 14 root 32 Power 3 2 See 4 2 2 15 INPUT MENU PROGRAMM...

Page 45: ...neering value An example of a user linearisation utilising all thirteen points is shown below There are a few rules which should be followed when using this facility a The HI and LO values for engineering range should have been set before any entry of data Any engineering values entered should lie between HI and LO b The entries for the electrical inputs should progressively increase There is no s...

Page 46: ...table 4 2 2 14 Square Root When the Square root characteristic has been selected the engineering range will still increase from LO to HI as the electrical input is increased but the response will be a square root rather than Linear see the diagram below The bottom 1 of the range is made to reflect equivalent linear value times 10 to avoid the near infinite gradient at zero The Process Variable is ...

Page 47: ...pplications For example calculation of Flow Rate from rectangular and V notch weirs require these non linear corrections The operation of the characteristic is the same as for square root except that the bottom 1 is not made linear the response is as follows INPUT MENU PROGRAMMING Page 47 ...

Page 48: ...contain either of these options The processor identifies which options are present on power up and invokes the appropriate programming menus accordingly Entry into the outputs menu presents a list of submenus relating to the output cards fitted The conditions determining the availability of submenus is summarised below OUTPUT MENU PROGRAMMING Page 48 ...

Page 49: ...submenus for the Relay and LED alarms are shown below Note that the only difference in content between them is there is no SENSE option in the LED submenu This is because the SENSE option relates to the activation of a OUTPUT MENU PROGRAMMING Page 49 ...

Page 50: ...tting oFF 4 2 3 1 2 LAtch Latch enable for an alarm The options for this are FALSE Latch disabled trUE Latch enabled When Latch is enabled the alarm remains set once triggered even when the Process Variable has returned to a non alarm condition A non latching alarm is self resetting when the alarm condition is removed Pressing CLEAR from the Display Process Variable mode clears a latched alarm if ...

Page 51: ...as a percentage of engineering range For high and low alarms the alarm triggers exactly at setpoint and is removed at the hysteresis level away from the setpoint See example based upon a high alarm below In the case of deviation alarms the hysteresis is applied to each trigger point either side of the setpoint Note that for thermocouples a 1 hysteresis band would be equal to 20 degrees Centigrade ...

Page 52: ...ering range that the input variable may vary before the alarm condition is activated This is illustrated in the example below The deviation alarm creates two alarm trigger points one above and one below the setpoint The trigger points are equally distant from the setpoint This is known as the deviation band and is a percentage engineering range OUTPUT MENU PROGRAMMING Page 52 ...

Page 53: ...per and lower setpoints Note that 1 deviation represents 20 degrees Centegrade for a thermocouple and 10 degrees Centegrade for an RTD default setting 0 00 4 2 3 1 6 SENSE Invert activation of relay This option sets the sense of the relay ie in the event of an alarm is the relay to be energised or de energised OUTPUT MENU PROGRAMMING Page 53 ...

Page 54: ...larm This option allows a delay time to be programmed in seconds which must elapse between an alarm being detected and then indicated and relay state changed The options are oFF No delay time 1 SEC 1 second delay 2 SEC 2 second delay 5 SEC 5 second delay 10 SEC 10 second delay 15 SEC 15 second delay 20 SEC 20 second delay If the alarm condition is removed during the delay period and then re applie...

Page 55: ... the following menu will be available from the Output menu 4 2 3 2 1 SPAN Output current span Span is the current range at which the output board is to operate The options are 4 20mA Output current will vary from 4 20mA 0 20mA Output current will vary from 0 20mA 0 10mA Output current will vary from 0 10mA OUTPUT MENU PROGRAMMING Page 55 ...

Page 56: ... span setting The value is entered as an engineering value Default setting 0 0 4 2 3 2 4 hi high retransmission range This is the engineering value at which the current output will be at its maximum value 20mA or 10mA See the diagram below for an example of the operation of this feature Note that it is acceptable for the hi range to be less than the lo although both must be within the span of the ...

Page 57: ...OUTPUT MENU PROGRAMMING Page 57 ...

Page 58: ...f operation In this mode the current output will directly relate to the value set within this programmable option The value entered must fall within the hi and lo range and will cause the maximum current to be output when set to the hi value and the minimum output current when set to the lo value OUTPUT MENU PROGRAMMING Page 58 ...

Page 59: ... is used to program a fixed voltage output from the following range of options 2 2 volts output 2 5 2 volts output 3 2 volts output 3 5 2 volts output 4 2 volts output 4 5 2 volts output 5 2 volts output 6 2 volts output 7 2 volts output 8 2 volts output 9 2 volts output 10 2 volts output 12 2 volts output OUTPUT MENU PROGRAMMING Page 59 ...

Page 60: ...g 2 Volts 4 2 4 SyS System parameters submenu This submenu allows access to all of the system based parameters such as passwords and communications facilities The system submenu is as follows 4 2 4 1 PASS Password submenu SYSTEM MENU PROGRAMMING Page 60 ...

Page 61: ...CCESS dEniEd before returning to the point of entry 4 2 4 1 1 CodE Password code This entry allows the user to modify the password code The current password is shown as an editable numeric entry Passwords are four digits long and can range from 0000 to 9999 default setting 4000 4 2 4 1 2 LEvEL Password start level The password level may be set up to start from any of the following levels SEtPt The...

Page 62: ...his is inconvenient Switching the Autocycle feature off Setting it to FALSE will inhibit any automatic stepping There are two possible options trUE Autocycle enabled FALSE Autocycle disabled default setting trUE 4 2 4 3 Co NEt Communications submenu This submenu contains the parameters required for the communications to operate on the unit The submenu is described as follows 4 2 4 3 1 bAud Baud ra...

Page 63: ...rdware limit of 30 instruments Default setting 1 4 2 4 3 3 tyPE mode of Comms operation There are two modes of Comms operation possible If the unit is to be operated within a network or a host computer accesses selective data then Slave mode is used The other mode simply outputs a complete ASCII status report consisting of the process variable and the state of any alarms or output options It is po...

Page 64: ...bration submenu This submenu which will always have password protection provides access to enable the total or partial recalibration of the System Casual access into this submenu is therefore discouraged CALIBRATION MENU PROGRAMMING Page 64 ...

Page 65: ...ric value in engineering units which is added to the Process Variable value in order to take out any system offset errors This should be used with care as there is no indication in the Process Variable display mode that this offset is being applied and is thus capable of introducing an inadvertent error Default setting 0 0 4 2 5 2 CAL 1 to CAL 10 Input calibration These are used to calibrate the i...

Page 66: ...nsor input board as shown below Press ENTER to commence automatic calibration Note if the display reads either siglo or sighi recalibrate the output card again On completion ESCAPE back to the Process Variable display mode This stores the calibration information in non volatile memory 4 2 5 4 CLvoP1 3 Calibrate Bridge excitation board CALIBRATION MENU PROGRAMMING Page 66 ...

Page 67: ...ess ENTER to commence automatic calibration Note if the display reads either siglo or sighi recalibrate the output card again On completion ESCAPE back to the Process Variable display mode This stores the calibration information into non volatile memory 4 2 5 5 rESEt Reset all parameters to default Pressing ENTER on this option resets all programmable parameters to their default values CALIBRATION...

Page 68: ...om the Display PV mode and an explanation of how the instrument processes input data and activates outputs 5 1 USER OPERATION There are a number of facilities available from the Display PV mode using the front panel keys These are summarised in the table below In addition it is possible to get into Menu Mode by pressing OPERATION USER OPERATION followed by Page 68 ...

Page 69: ...le to be viewed possibly SEtP1 Successive pressing of the CYCLE key will cycle through the other available setpoints If any setpoint value is required to be viewed the SHIFT key is pressed The actual setpoint value is now displayed The format of the setpoint display will be alarm action Setpoint value where alarm action will be one of four single characters o Alarm Off L Low Alarm h High Alarm d D...

Page 70: ...l remain displayed until 1s after the key is released It will then return to the Process variable display 5 1 3 VIEW VALLEY DISPLAY This operates in exactly the same way as the View Peak display except that the INC key is used and the minimum Process Variable value displayed 5 1 4 RESET PEAK VALLEY CLEAR LATCHED ALARMS Pressing the CYCLE and INC keys simultaneously performs two independent functio...

Page 71: ...r offset and drift Readings are made ten times a second 5 2 2 SIGNAL CONDITIONING This process depends largely upon the menu programming If the input is a temperature sensor the temperature characteristic is linearised here If the input is a voltage or current the conditioning will be Linear Square root Power Law or User defined as programmed in the Inputs menu 5 2 3 FILTERING The programmable fil...

Page 72: ...r exceeds the maximum 5 2 5 OUTPUT CONTROL The alarm Relays LED alarms and current retransmission options may all use the filtered conditioned Process Variable Value This is the same value which is displayed This process responds to any errors detected If the input is a temperature sensor an open circuit will invoke the burnout condition going to hi scale or low scale depending upon the burnout pr...

Page 73: ...tion data corruption fault burn SENSOR BURNOUT ERROR Open circuit RTD Any one of the three wires Open circuit Thermocouple Cold junction thermistor temperature out of bounds Cold junction thermistor electrical fault OvEr UndEr INPUT SENSOR FAULT Sensor over range Sensor under range Open loop current circuit RTD short circuit Open circuit mV User non lin function out of bounds If an error message i...

Page 74: ...lly cut from the overall sheet marked with any appropriate plant tag or identification and pushed gently into the slot provided in the bottom right hand corner of the front panel of the instrument see drawing below These legends may be subsequently removed by means of a sharp pin in the notch provided The Legend sheet is included with the instrument APPENDIX A APPENDICES Page 74 ...

Page 75: ... 1 C TC F 0 to 600 C 0 5 C 1 C TC N 0 to 1300 C 0 5 C 1 C TC B 1000 to 1800 C 0 5 C 3 C Cold Junction 0 to 50 C iii 0 1 C 1 C v Pt100 200 to 800 0 05 C 0 1 0 1 ii 10volts 10V to 10V 0 004 0 02 1 5volts 1V to 5V 0 008 0 04 1volt 1V to 1V 0 004 0 02 100mV 0 1V to 0 1V 0 004 0 02 4 20mA 4 to 20mA 0 004 0 1 0 20mA 0 to 20mA 0 004 0 1 0 10mA 0 to 10mA 0 004 0 1 Transmitter excitation voltage 19V Maximu...

Page 76: ...formation Comms Interface 500VAC on page 8 INPUT OVER RANGE PROTECTION Input Pin Usual Function Absolute Maximum Rating 1 0V NA 2 RTD 30VAC xii 3 Volts 200VAC xii 4 Millivolts 200VAC xii 5 Curret 100mA RELAY OUTPUT BOARD OPTION 01 AND 02 Maximum Rated Load 7A 250V 7A 30V Maximum Power 1750VA 210W Maximum Switching Voltage 380V 125V Electrical Life 105 operations at rated load Mechanical Life 50 mi...

Page 77: ...e 30VDC Sink Minimum practical loop power supply voltage RL 21mA 3 Sink Where RL is the Loop impedance Ripple Current Approx 5uA Isolation Input 500VAC Power Supply 2500VAC See safety information Comms I F 500VAC on page 8 VOLTAGE OUTPUT BOARD OPTION 04 PERFORMANCE 20 C Range 2 24 volts DC Accuracy 24mV 0 1 of Max voltage Maximum Current O P 50mA xi Thermal Drift 1080uV C 0 0045 of Max voltage C R...

Page 78: ...RECEIVER Differential input threshold voltage 200mV Input receiver impedance 12kohms Common mode range 7v to 12v ENVIRONMENTAL Ambient operating temperature range 0 to 50 C Ambient storage temperature range 20 to 80 C Relative Humidity 20 to 95 non condensing EMI Emissions BS EN61326 EMI Susceptibility BS EN61326 Safety BS EN61010 1 Power Supply 240VAC 110VAC 24VAC 50 60Hz Power consumption 6 5Wat...

Page 79: ...dings to compensate for gain and offset errors v Cold junction accuracy includes thermal tracking error temperature measurement error and linearisation error This should be added to the individual thermocouple accuracy to get an overall accuracy value vi represents percentage of full scale value vii Input is measured correctly within a small margin outside the normal range This is 7 for bipolar el...

Page 80: ...is set up for the correct sensor type 2 2 Check that the Engineering range has been set correct for voltage and current and correct units for temperature sensors 2 3 Check that thermocouples have correct compensation cable and the polarity is correct 2 4 Check that all three wires are connected properly for an RTD 3 UNDER OVER RANGE 3 1 Check that the sensor wiring is correct 3 2 Check that voltag...

Page 81: ... the user In the event of these codes being displayed the unit should be returned to the supplier The Error Codes are as follows Err 01 Non Volatile memory failure Err 02 Ram decode error Err 03 Ram size unrecognised Err 04 Input card Error Err 05 EPROM Checksum error Err 06 RAM fault Err 07 Calibration data corruption fault APPENDIX C APPENDICES Page 81 ...

Page 82: ...e front panel with a damp cloth containing a small quantity of detergent DO NOT use an abrasive cleaner DO NOT use any industrial solvents as they might affect the polyester membrane DO NOT apply water to any other part of the instrument other than the front panel The rear of the instrument is not sealed and water in this area could be dangerous and may lead to damage of the instrument APPENDICES ...

Page 83: ...interface and the basic comms operation of the instrument The schematic of a typical network showing three instruments is shown below Note that this is not wiring detail only a schematic of signal interconnections You will notice that the transmit lines from the units are connected together This means that only one unit can transmit at a time without clashing the signal For this reason the communi...

Page 84: ...STER requests data from a SLAVE Data Imposition MASTER writes data to a SLAVE The most convenient way to describe these message types is to show an example for each message type It is not important to understand the full detail of the message at this stage as this will be covered later however the following control code definitions will probably be useful SOH Start Of Header STX Start Of Text ETX ...

Page 85: ...the main part of the message to see what action to take The main part of the message in this case is CH000 The question mark is the first character and is used to denote that the message is a data request CH is a mnemonic representing CHannel value Process Variable A full list of mnemonics are available later on in this Appendix The remainder of the message is called the index and as there is only...

Page 86: ...applies the first Alarm Alarm 2 would have an index of 002 Device 2 updates the Alarm setpoint with 80 0 and then responds with an acknowledgement as shown below There is one important point to understand here The new Alarm Setpoint has been programmed into the device and will be used to control the Alarm operation However it has not been programmed into non volatile memory within the instrument s...

Page 87: ...he instrument do an action In this case the action is to save all of the settings to non volatile memory The MASTER sends the following sequence Again device 2 receives the message which is initially treated as a Data imposition The ds mnemonic is taken as an instruction to do a data store to non volatile memory An index or data is superfluous and is not included On doing a data store an acknowled...

Page 88: ...es the end of the end of the main part of the message and the Block check character will follow The End of Text character has a value of 03 The BCC has not got a fixed value like the other control codes as it is a calculated value based upon a modulo 256 sum of all non control code characters in the message This is calculated for each message before it is transmitted and the receiver confirms that...

Page 89: ...lates block check character based on header and text strings 150 sum 0 lh len header lt len text 170 for i 1 to lh sum sum asc mid header i 1 next 180 for i 1 to lt sum sum asc mid text i 1 next bcc sum 256 int sum 256 190tx chr 1 header chr 2 text chr 3 chr bcc 195 return 200 REM Reads in received data without checking block check character 240 rx 245 ch input 1 1 if ch chr 1 goto 245 250 ch inpu...

Page 90: ...S AH AD As Ad AC SI TI HI LI PI OV Ac PC PL UO GS SY ds NA NA NA NA NA NA NA NA NA NA NA NA NA 1 13 1 13 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 3 1 3 1 3 1 3 1 3 1 3 NA NA NA NA NA NA NA VALUE OPTAIN OPTION OPTION OPTION OPTION OPTION OPTION VALUE VALUE OPTION OPTION OPTION VALUE VALUE OPTAIN OPTAIN VALUE VALUE VALUE OPTAIN OPTAIN OPTAIN OPTION OPTION VALUE VALUE VALUE O...

Page 91: ...item within the list of parameters denoted in the associated FORMAT column of the Message table The numbering starts from zero E G An Alarm action AA High Alarm will have a data field corresponding to 2 These are ASCII numeric fields which are scaled and formatted according to the entry in the FORMAT column of the message table ENGINEERING UNITS ENG HI 7 ENG HI 7 6 DP REAL 32000 64000 6 DP ELECTRI...

Page 92: ...data requested the returned data format is as follows aabbbbbb0ccde0000ff0000 aa device type DM for Digital Meter bbbbbb Issue date of software cc Variant type U 01 C 02 A 03 d Contents of option slot 1 Nothing fitted 0 Single Relay board 2 Dual Relay board 3 Volt o p 4 RTX board 5 e Contents of option slot 2 Format as above ff Number of channels 01 always APPENDICES APPENDIX E Page 92 ...

Page 93: ...ut submenu output span 55 output operation 55 retransmission range 56 preset value 58 calibration 65 D Display information 72 E Editing a parameter 31 Error codes 81 F Instrument faults 73 Filtering description 71 input filtering 42 jump out 43 G Comms board grounding problems 24 I Input wiring sensor connection 11 voltage input millivolt 12 voltage 12 voltage greater than 10V 13 current input ext...

Page 94: ...28 moving around the menu 29 entering into a submenu 29 editing a parameter 31 escaping from submenus 33 R Relay boards wiring 17 submenu alarm state 50 latch enable 50 setpoint 50 hysteresis 51 deviation band 52 invert activation of relay 53 delay 54 Reset all parameters to default 67 S Sensor connections 11 Setpoints setpoints submenu 35 view setpoints 69 Signal conditioning 71 System parameters...

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