PML 1000 Operating Instructions
Contents
1. 1000 Operating Instructions www meas spec com 1109 16 18 measurement SPECIALTIES eo PML 1000 Operating Instructions Analog Output Ranges 0 10V 0 20mA or 4 20mA selectable Accuracy 0 2 of span Temperature drift lt 100ppm C Output Ripple lt 10mV or50mA 30Hz Response 63 within 32mS 99 within OOmS Resolution 0 05 of span 5mV or 0 01mA Maximum output 18V 25mA Isolation 500V Communications Interface Type EIA RS485 RS 422 Compatible Display Type 0 56 High brightness 7 segment LED red Optionally green Range 19999 to 99999 APPENDIX A CALIBRATION Introduction This appendix describes the steps necessary to calibrate your LVDT to your PML 1000 in more detail Initial Set up The LVDT should be connected to your PML 1000 as described earlier in this manual and the appropriate input measurement mode selected from the input menu You should also set up the correct excitation voltage and frequency for your LVDT as described in the documentation supplied with your LVDT The PML 1000 uses different amplification gains depending on the output of your LVDT In order for the PML 1000 to set the correct gain for your LVDT you need to set the LVDT sensitivity and stroke values in the input menu If you are unsure of the characteristics of your LVDT then you should select the Automatic Gain selection option from the input menu and set this to ON Null Position Locator It is important that the LVDT operates arou2. of the menu s there are two ways of setting or changing parameters by selection from a list of options or by editing a numeric value directly Option Edit Mode When the option edit mode is selected the left hand digit of the current option will flash indicating edit mode The front panel keys perform the following functions Selects the currently flashing option as the new setting and exits the option list back to the menu s or A Move up or down the list of options APP 01025 Rev A PML 1000 Operating Instructions MENU MODE KEY FUNCTIONS OPERATOR MODE KEY FUNCTIONS Numeric Value Entry Mode On entry to edit a numeric value its LSD Least Significant Digit will be flashing This is the currently editable digit To change the value of the editable digit use the UP and DOWN arrow keys to increment or decrement the digit To select the next digit to edit use the NEXT key far left which will move to the next digit which will flash Using the NEXT and UP and DOWN arrow keys the value can be changed to any number within the valid display range of the PML 1000 or within the limits of the parameter For some values the position of the decimal point may be changed When this is possible the decimal point will flash when the NEXT key is pressed after editing the MSD Most Significant Digit To enter a negative value the MSD may be used to enter or 1 When editing numeric values the front panel keys perform the followin
3. or switches Open collector transistor outputs can also be used The inputs are active low i e activated by applying a short circuit between the status input and status common terminals The diagrams below show some typical applications Note that these inputs are not isolated from the PML 1000s input circuit High Speed Analog Output A buffered DC output of the demodulated LVDT input signal is provided by the PML 1000 The output level is dependent upon the transducer excitation and the sensitivity of the LVDT The output is not calibrated or scaleable and it is recommended that it is used for diagnostic purposes only Use terminals 20 a out and 13 a out to connect the High Speed Analog output This output is not isolated from the LVDT High Speed Analog Output Connections APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 measurement SPECIALTIES PML 1000 Operating Instructions Menu Mode Key Functions The PML 1000 may be configured using the front panel keypad to enter and navigate through the multi level menu structure When navigating through the menu s the front panel keys perform the following functions al Used to select or access a sub menu G Used to scroll forward through the menu s Used to scroll backwards through a menu Moves back up to the previous menu Multiple key presses will always return the PML 1000 to the measured value display At the edit or entry level
4. these constants are all retained when power is removed from the PML 1000 When a calibration is performed with the Automatic Gain selection enabled the PML 1000 will determine the optimum internal gain setting for all future measurements from the output levels from the LVDT detected during calibration APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 17 18 measurement SPECIALTIES o PML 1000 Operating Instructions Scaling the Display In order to display the displacement or other parameter in the correct units of measurement it is necessary to first scale the PML 1000 To do this select SCLE from the main configuration menu and enter the desired Low and High display values The low display value corresponds to the displacement at the Low input calibration point i e 0 mm The high display value corresponds to the displacement at the high input calibration point i e 200 mm Calibration Subsequent routine calibrations of the LVDT to the PML 1000 can be performed either from within the menu s or by assignment of either a status input or function key The low and high display scaling values will be retained throughout subsequent calibrations all subsequent calibrations must be performed using the same points otherwise the LDSP and HDSP values will need to be changed The calibration points used may be set anywhere in the display range of the PML 1000 i e 19999 to 99999 The can read above and bel
5. 000 has detected a fault in its measurement circuitry UCAL The PML 1000 has detected a problem or error in its non volatile memory resulting in a loss of calibration data Note For any of the above error messages return the PML 1000 to the supplier brA The PML 1000 has detected a problem with the sensor resulting in an open circuit input this may be caused by a break in one of the leads from the transducer or a fault in one of the transducer elements oUEr The measured value is too large positively to be displayed or is above the specified input range undr The measured value is too low negatively to be displayed or is below the specified minimum input for the selected range PRODUCT SPECIFICATION Supply 90 265V AC SO 60Hz 20VA max Operating Conditions Ambient Temperature Storage 10 C to 70 C Operating 10 C to 50 C Humidity 10 to 95 RH non condensing Input ADC High precision Sigma Delta Input range 0 05V rms 5V rms Resolution 18bit Non Linearity lt 0 02 Temperature Drift lt 50ppm C Stability lt 0 01 FSO after 15 minutes Input Impedance 100kn Common mode rejection gt 150dB Series mode rejection gt 700dB 50 60Hz Excitation Voltage 3V AC rms or IV AC nos selectable Frequency 2 5 kHz or 10 kHz selectable Temperature drift amplitude lt 100ppm C frequency lt 100ppm C High Speed Analog OjP Output 10V maximum Response Output filter 3dB 125Hz APP 01025 Rev A PML
6. N Press amp Hold APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 measurement SPECIALTIES Cop Se PML 1000 Operating Instructions 29999 9 9999 Poa Fr oo faii r T H DS l __ Leet L ot LOO CONFIGURING THE DISPLAY Decimal Point Position dP Allow the position of the decimal point on the display to be set The decimal point may be positioned to give 0 1 2 3 or 4 digits after the decimal point i e 3 decimal places would be 99 000 The default is 1 decimal place Display Update Rate rAtE This allows the update rate of the display to be set from every 0 1 seconds to 0 5 seconds The options are 2 4 or 10Hz the default setting is 2Hz APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 9 18 measurement SPECIALTIES eo PML 1000 Operating Instructions Display Filtering Filt This parameter is used to set up filtering of displayed values The time constant of the filter entered in seconds The default value is zero no display filtering Least Significant Digit Zero LSd0 When this parameter is set to ON the right hand digit only displays zero during normal running The default is OFF Brilliance briL Allows the brightness of the display to be adjusted to match other PML 1000s or to suit ambient lighting conditions The brightness may be set in the range 1 to 4 The default setting is 4 which is the highest inten
7. cal parameters can and do vary in different applications All operating parameters must be validated for each customer application by customer s technical experts Measurement Specialties Inc does not convey any license under its patent rights nor the rights of others APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 18 18
8. d 4 wire half and full duplex communications systems The unit supports three protocols as standard a simple text based command set plus MODBUS ASCII and RTU J BUS PML 1000 Address Addr Defines the PML 1000 address when using the PML 1000 in a multi drop system the range of valid addresses is 1 247 The default is 1 Baud Rate bAud Allows the baud rate to be selected The options are 1200 2400 4800 9600 The default is 9600 Protection Prot Allows the PML 1000 parameter settings to be protected against change from the serial interface write protection ON The default is OFF Parity PrtY Defines parity for all communications The options are even odd or no parity The default is Even Stop Bits StoP Defines the number of stop bits 1 or 2 The default is 1 MODBUS Options The following three parameters are for MODBUS communications protocols for data scaling and resolution Values returned from option locations i e Input Type are not scaled Span SPAn Span range used for MODBUS data scaling resolution Low Scaling Value L P The display value which corresponds to 0 in a scaled MODBUS message High Scaling Value H P The display value which corresponds to the SPAN maximum in a scaled MODBUS message Remote Terminal Unit rtu If MODBUS RTU sometimes known as J BUS protocol is required select this option ON The default is OFF Transmit Delay dELY Pre transmit delay adds a
9. d to your requirements To configure the analog output select the Aout menu Output Type tyPE Allows the output to be set to 0 10V 0 20mA or 4 20mA The default setting is 0 10V Signal Source SorC Defines the source of the values to be output The source can be selected from the display value inPt maximum or peak value High minimum value LoW Average value Av or a value received from the communications interlace SEr The default is inPt Low Scaling Point LoU Defines the display value at which the output will reach its minimum level i e 4mA 4 20mA OMA O 20mA or OV 0 10V dependant on analog output type selected above The default value is 0 High Scaling Point Hi9H Defines the display value at which the output will reach its maximum level i e 20mA 0 or 4 20mA or 10V 0 10V dependant on analog output type selected above The default value is 100 Damping dAnP Output damping defines the time constant in seconds for damping the output This parameter is used to limit the rate of change of the output and may be adjusted in the range 0 to 999 seconds The default is 0 APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 12 18 measurement SPECIALTIES o PML 1000 Operating Instructions CONFIGURING OPTIONAL SERIAL COMMUNICATION The PML 1000 provides a RS48S 422 compatible communications interface The interface is designed to operate in both 2 an
10. d to the frame ground or ground connection of the master device The diagram below shows the wiring required for both 4 wire full duplex and 2 wire half duplex installations PC or Master Device PC or Master Device Tx Rx E Txmx E A B 4 wire and 2 Wire Communications Interface Connections POWERING THE PML 1000 The PML 1000 is designed to operate from an AC supply with voltages in the range 90 26SV AC SO 60Hz mains supply The maximum power consumption is 20VA when all outputs are fully loaded and the display has all segments illuminated WARNING The PML 1000 is designed for installation in an enclosure which provides adequate protection against electric shock Access to power terminals should be restricted to authorized skilled personnel only Application of supply voltages higher than those for which the PML 1000 is intended may compromise safety and cause permanent damage The diagram below shows how the PML 1000 should be connected to the mains supply Isolation should be provided by a double pole switch and a Time delay 1A fuse Live 30 265V AC Neutral 50 60Hz Recommended Mains Supply Connections APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 measurement SPECIALTIES Fe PML 1000 Operating Instructions e CONNECTING THE STATUS INPUTS There are two status logic inputs on the PML 1000 These inputs can be used with voltage free contacts such as relays
11. delay in milliseconds before the PML 1000 responds to any received commands This allows the unit to operate more reliably in two wire multidrop systems using older SCADA packages APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 13 18 measurement SPECIALTIES o PML 1000 Operating Instructions CONFIGURING STATUS INPUTS The PML 1000 provides two status logic inputs which can be assigned to perform one or more functions when activated With the exception of the Calibration function which is started when there is a transition from inactive to active state on the input all other functions will be active only while the status input is active The status inputs are active low i e placing a short circuit across the input from a switch or relay contact will activate the input The following functions may be assigned to the status inputs 1 and 2 Status 1 The default is OFF Displays diSP Allows anyone of the following to be displayed while the status input is active Lamp test the average low or high values or display hold When the status input is inactive the normal measured value is displayed The default for this is NONE Reset rSEt This resets the High peak Low minimum and Average values to the current measured value The default for this option is OFF Front Panel Keypad Disable LoCR Disables the front panel keys the default state is OFF Analog Output Hold AHLd Th
12. e value subtracted is the current value when the key is pressed When the Tare function is assigned to a function key pressing the key once will activate Tare relative displacement measurement pressing the key again while Tare is active de activates the Tare function SYSTEM OPTIONS Password PASS Password protection is enabled by entering any value between 1 and 99999 When this facility is enabled the configuration menu cannot be accessed without first entering the correct password number The default value is O No Password Default dFLt This allows the unit to reset back to its factory default settings Select ON to default the PML 1000 This parameter will automatically revert to OFF when the PML 1000 is defaulted Time out tout This defines the time in seconds that the unit will remain in configuration mode when there is no key activity If there are no key presses within the specified period the unit will return to normal operation The default time out is 90 seconds and is adjustable between 30 to 300 seconds Note This facility is disabled during the Calibration sequence APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 15 18 measurement SPECIALTIES o PML 1000 Operating Instructions e MESSAGES Error Messages Err1 Err2 Err3 These messages indicate that a memory error has been detected in the PML 1000s internal memory area AdEr This indicates that the PML 1
13. g functions aay Enter value and exit from edit or entry mode co Selects the next digit flashing or decimal point flashing to be edited O Increments the current digit being edited or moves decimal point position Decrements the current digit being edited or moves decimal point position 3 Clears a numeric value to zero www meas spec com c00 1109 PML 1000 Operating Instructions Operator Functions All of the operator functions are described the following section along with the key actions required The diagram that follows shows the menu of facilities available directly from the operator normal display mode Operator Mode Key Functions a Enter Allows access to the operator functions the low high peak and average values since the last reset and Configuration mode Set up mode To access the operator functions press and hold for approximately 5 seconds until LOW is displayed Next Function key 1 can be configured to perform various functions such as FAST CAL display zeroing or display tare Down Up Exits from set point menus to normal running amp Star Function key 2 can be config ured to perform various functions APP 01025 Rev A PML 1000 Operating Instructions measurement SPECIALTIES 9 00 Menu Navigation 1 To get to the Set up menu press and hold until set up is displayed 2 Press aly to go to the first menu item 3 Press to
14. ghten the screws as this may damage the case APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 measu rement SPECIALTIES oe PML 1000 Operating Instructions CHI cH Out Im 81 2 Re Tx UP Amp Vil out P Input Sete Analogue Output 90 265V AC Rear Panel Terminal Connections Terminal Function 1 N C 2 Excitation Yel Red or Brn Pin F 3 Excitation Yel Blk or Yel Pin E 4 Receive A 5 Receive B 6 Transmit A 7 Transmit B 8 Status Logic Input 2 9 Status Logic Input 1 10 Status Input Common GND 11 Power input Neutral 12 Power Input Live 13 Analog Output 20 Analog Output 14 High Speed Analog Output 15 CH2 B Input 16 Amplifier Gain Stage Output 17 Amplifier Gain Stage Input 18 Secondary 1 Red Pin A 19 Secondary 2 Blk Pin D APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 measurement SPECIALTIES o PML 1000 Operating Instructions CONNECTING THE COMMUNICATIONS INTERFACE The diagrams below show the connections necessary to interface your PML 1000 to a PC RS485 422 port or to an RS485 to RS232 Converter It is recommended that screened twisted pair cable be used for all applications requiring cable lengths greater than 3m It is also recommended that a 1200 termination resistor is added to across each pair of wires at the furthest point from the master device The shield of the cable should be connecte
15. in the same wire way e Use shielded cables or wires for all signal sensor leads with shield grounded at one point only CONNECTIONS Panel Mounting Ensure that there is sufficient space behind the panel for the depth of the PML 1000 allowing for safe routing of cables The diagram below shows a side view of the meter showing its dimensions 7mm 15mm 0 3 inches 0 6 inches i 151 mm oe ee 166mm lt _ 66inches gt Depth behind panel The PML 1000 is supplied with an installation kit consisting of two mounting clamps and a panel sealing gasket To install the meter 1 Make panel cutout with dimensions as shown below Panel thickness from l 5mm to 9 5mm can be accommodated y3mm a S 3 66 inches 445mm 1 75 inches 2 Fit the rubber seal by slipping it over the unit from the rear of the box pushing it forwards until it sits behind the front lip of the unit 3 Insert the PML 1000 into the panel from the front pushing it through as far as the front lip ensuring correct seating of the rubber seal between the panel and the unit 4 Working from behind the panel take the two mounting brackets locate on to the case as shown below note orientation of keyhole slots relative to the meter case With the brackets located slide them backwards until they lock into place 5 Tighten the screws until they bite into the panel securing the PML 1000 in place Take care not to over ti
16. is allows the analog output to be held at a Frozen level The default state is OFF Auto Fast Calibration CAL This is used to initiate the automatic calibration process The process is started when the status input is activated The default for this option is OFF Zeroing 2ErO This sets the measured and displayed values to Zero 0 000 permanently or until the PML 1000 is defaulted removing any offset errors from the system The default for this option is OFF Tare tArE This tares the measured value subtracting a fixed amount from all subsequent measurements The value subtracted is the current value when the status input is activated on a transition to the active state only tare or relative displacement will be displayed while the status input is active The default is OFF Status Message Display SdSP This enables or disables the display of messages related to the status input function When ON messages are displayed alternately with value being displayed i e if the unit is displaying the high value then the high value is displayed flashing with the message HiGH This indicates to the user that the current input value was not being displayed The default is OFF Status 2 Configured the same as Status 1 APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 14 18 measurement SPECIALTIES e PML 1000 Operating Instructions CONFIGURING FUNCTION KEYS There are two configurable f
17. main Configuration menu select the CAL menu The unit will display L iP Set the LVDT to its zero or null position and press Enter The unit will now calibrate to the zero input position of the LVDT While this is in progress the unit will display Wait VAIT Once the zero low position has be calibrated the unit will display H IP Set the LVDT to its maximum displacement position normally full scale and press enter The unit will now calibrate for this position Wait will be displayed while this operation is in progress At the end of the calibration process the unit will return to the main menu and display CAL NOTE For best results power the system for 30 minutes before calibrating Scaling SCLE The PML 1000 is now calibrated to your LVDT The default scaling is set to 100 0 units To allow the unit to display the correct displacement for your LVDT the low and high display values need to be defined To set the display scaling use the scaling menu SCLE and set the low display LDSP to the minimum displacement calibration point value usually zero and set the high display value to correspond to the maximum displacement calibration point value usually full scale Having defined the display scaling the PML 1000 will now display displacement in the correct units of measurement and will be calibrated to the attached LVDT In some cases it may be necessary to adjust the number of decimal places to give the best resolution The decimal point p
18. measurement SPECIALTIES oe PML 1000 Operating Instructions DESCRIPTION This Set up Guide describes how to install and configure your PML 1000 This PML 1000 is marked with the international hazard symbol It is important to read this Set up Guide before installing or commissioning your panel meter as it contains important information relating to safety and Electromagnetic Compatibility EMC The PML 1000s provide the following features as standard e Scaleable Analog Output e Dual Logic Status inputs e Optional RS485 Serial Communications interface with three protocols including MODBUS RTU e 5 digit bright LED display e Programmable function keys e High Speed Analog output INSTALLATION To install your PML 1000 you will need to carry out the following steps e Install the PML 1000 into a panel e Make connections to the PML 1000 Please note e Ensure that the power to PML 1000 is switched off before carrying out any installation or maintenance work e It is recommended that all connections to the terminals are made using ferrules to afford greater reliability and to prevent short circuits between adjacent terminals e Avoid installing the PML 1000 close to switch gear contactors or motor starters APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 measurement SPECIALTIES o PML 1000 Operating Instructions e e Do not place signal and power supply wiring
19. nd the midpoint of its stroke as this gives the best results by minimizing any errors due to non linearity A feature of this PML 1000 is the ability to locate the midpoint of the LVDTs measurement range Null point To do this select NULL from the main menu and a value will be displayed flashing The nearer the value to zero the nearer the LVDT is to its null position The LVDT should be mounted so that the required measurement range is equally divided by the Null position Initial Calibration To perform an initial calibration of the LVDT to the PML 1000 select the CAL option from the main menu The display will show the message L iP low input Set the position of the LVDT to its minimum displacement position minimum stroke and note the displacement i e 0mm When the LVDT is set at its low calibration point press the Enter key the display will show Wait while the PML 1000 measures the output from the LVDT This takes a few seconds When finished the display will show H iP this indicates that the PML 1000 is ready to calibrate the high point Set the LVDT to its high calibration point maximum displacement position i e 200mm Press enter when ready to continue and the unit will display the message WAit while it is measuring the output from the LVDT At the end of the calibration sequence the PML 1000 will use the two measured output values from the LVDT to calculate its own calibration constants which it will utilize in all future measurements Note
20. ng greater than the maximum positive input level of the PML 1000 at the specified sensitivity undr The PML 1000 has detected an error during calibration caused by the output of the LVDT being lower than the minimum negative input level of the PML 1000 at the specified sensitivity H L The PML 1000 measured the same output from the LVDT at both calibration points High Low Calibration using status input 1 The unit can be configured to perform an automatic calibration sequence in response to a status or logic input When this facility is enabled the calibration is initiated by holding the status input active for a minimum of 1 second The sequence followed is very similar to that followed when a calibration is performed from the Menu as described above Calibration using function keys The NEXT or STAR keys can be assigned to perform a calibration sequence This facility can be enabled or disabled from the KEY1 or KEY2 menus To instigate a calibration press the function key the display should flash the message CAL To continue with calibration you must press the same function key again within 5 seconds If the key is not pressed to confirm within the allowed time the unit will revert to normal operation Once instigated the procedure followed is the same as for menu initiation as described above CONFIGURING THE ANALOG OUTPUT The PML 1000 provides a fully scaleable and isolated analog retransmission output which can be configure
21. osition may be changed from the display menu Low Zero Display Value LdSP This is the 0 or minimum displacement display value which corresponds to the Low calibration point L iP This value is entered directly but may be changed to any value within the display range of the PML 1000 The default value is set to 0 0 High Display Value HdSP This is the 100 or maximum span displacement display value which corresponds to the HiGH calibration point H iP This value is entered directly but may be changed to any value within the display range of the PML 1000 The default 100 0 CAL Main menu Calibration option Press Enter to select L P Unit is now waiting for the LVDT to be set to its zero null position When ready press the Enter key to continue VAit The Indicator will now measure the output from the LVDT The indicator is now waiting for the LVDT to be set to its full scale position When ready press the Enter key to continue H P Unit will now measure the output from your LVDT and will determine the appropriate Gain CAL Calibration is finished and has been completed successfully with no errors detected by the PML 1000 The PML 1000 returns to the menu APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 11 18 measurement SPECIALTIES e PML 1000 Operating Instructions oUEr The PML 1000 has detected an error during calibration caused by the output of the LVDT bei
22. ow the nominal calibration points although for best performance it is advisable to calibrate at the extremes of the required measurement range ORDERING INFORMATION NORTH AMERICA EUROPE ASIA Measurement Specialties Measurement Specialties Measurement Specialties China Ltd Europe Ltd 1000 Lucas Way No 26 Langshan Road Hampton VA 23666 rea ATN r Shenzhen High Tech Park North United States Cernan Nanshan District Shenzhen 518107 Tel 1 800 745 8008 y China l Tel 49 0 231 9740 0 EE OO e Fax 49 231 9740 20 Sales pvg cs amer meas spec com Sales pvg cs emea meas spec com Tel 86 755 3330 5088 Fax 86 755 3330 5099 Sales pvg cs asia meas spec com The information in this sheet has been carefully reviewed and is believed to be accurate however no responsibility is assumed for inaccuracies Furthermore this information does not convey to the purchaser of such devices any license under the patent rights to the manufacturer Measurement Specialties Inc reserves the right to make changes without further notice to any product herein Measurement Specialties Inc makes no warranty representation or guarantee regarding the suitability of its product for any particular purpose nor does Measurement Specialties Inc assume any liability arising out of the application or use of any product or circuit and specifically disclaims any and all liability including without limitation consequential or incidental damages Typi
23. scroll through the menu items list 4 Press ay after selecting a menu item from the list to configure the item 5 Press to scroll through the menu item s configuration routine 6 Press to be able to change a parameter in the configuration item and use the and arrows to change the value of the item Press A to complete the change 7 Press Col to continue to the next configuration item or the arrow to return to the set up menu list items 8 Perform steps 3 through 7 again to edit other set up menu list items 9 Press the O arrow twice to return to the newly contigured normal running mode www meas spec com 1109 measurement SPECIALTIES 86 o PML 1000 Operating Instructions CONNECTING THE TRANSDUCER The transducer should be connected to the PML 1000 as illustrated in the diagram below The PML 1000 is designed to operate with an LVDT in the Secondary to Primary Ratiometric Mode Using this mode the PML 1000 determines the measurement by taking into account both the primary and secondary voltages The PML 1000 measures the differential output of the LVDT SECA SECB The excitation voltage across the primary coil is also measured When using this measurement mode the measurements will automatically be compensated for changes in the excitation voltage See table on page five for additional LVDT connection information Secondary Center Tap Must Be Tied For Operation MENU NAVIGATIO
24. sensitivity of your LVDT should be in the documentation supplied by the manufacturer The sensitivity is entered directly as a value in mV V mm The default sensitivity is 10 0 mVIVImm This menu option is not accessible when Automatic Gain selection is enabled On Stroke Stro This allows the stroke of the LVDT to be entered as a value directly in mm This is used by the PML 1000 in conjunction with the LVDT sensitivity to determine the appropriate gain setting This menu option is not accessible when Automatic Gain Selection is enabled The default stroke setting is 100 0mm Excitation Voltage Uout Select the correct output voltage for excitation for the LVDT The nominal voltage will be specified in the LVDT documentation There are two options 3V AC and IV AC rms the default setting is 3V Excitation Frequency H2 Set the excitation frequency closest to that specified in the LVDT documentation The options are 2 5 kHz or 10 kHz The default is 2 5 kHz APP 01025 Rev A PML 1000 Operating Instructions www meas spec com 1109 10 18 measurement SPECIALTIES eo PML 1000 Operating Instructions CALIBRATION AND SCALING Introduction Your PML 1000 is designed to operate with a wide range of different LVDT types and in most commonly used measurement modes Before your LVDT can be used it must first be calibrated to the PML 1000 This is performed very easily with the FAST CAL facility Calibration CAL From the
25. sity setting Test tESt Performs a display test which illuminates all display digits and segments 8 8 8 8 8 when the enter button is pressed CONFIGURING THE INPUT FOR YOUR LVDT Introduction inPt Before any calibration or scaling operations are performed some operating parameters related to the use of the particular LVDT need to be set These parameters are all set up from the input menu Setting Input Gain There are two methods of determining the gain used by the PML 1000 for measurements and calibration Firstly the gain can be determined automatically at the time of calibration by the PML 1000 Set the auto option from the input menu to ON Alternatively the sensitivity and stroke of your LVDT can be entered from the menu This data will normally be supplied with your LVDT The sensitivity of the LVDT is normally quoted in mV V mm and is entered in this form The stroke is set in mm and Is the measurement range of the LVDT Automatic Gain Selection AUto Allows the PML 1000 to set its gain automatically by determining the sensitivity of the attached LVDT during calibration A more detailed explanation of how this works can be found in Appendix A on Calibration The options are Automatic Gain Selection Enabled On the default state or disabled OFF Sensitivity SEn This value is entered to allow the gain of the measurement input of the PML 1000 to be determined from the specified sensitivity of the LVDT Details of the
26. unction keys Function key 1 Function key 2 The following functions may be assigned either or both keys unless stated Displays diSP Allows anyone of the following to be displayed while the Function key is pressed Lamp test the average low or high values or display hold When the key is released normal display is returned The default is NONE no display function Reset rSEt If ON the function button will reset the High Maximum Low minimum and Average values to the current measured value The default is OFF Auto Fast Calibration CAL If this parameter is ON then the function key 1 or 2 will initiate the automatic calibration process When pressed the display will flash the message CAL the key must be pressed again while the display is flashing to perform the function The default state is OFF This sets the measured and displayed values to Zero 0 000 permanently or until the PML 1000 is defaulted or calibrated removing any offset errors from the system When assigned to a function key pressing the key once will cause the message ZEro to be flashed To perform the ZERO the key must be pressed again to confirm the operation while the display is flashing approximately 5 seconds Once confirmed the ZERO will be performed immediately The default state for this function is OFF Tare tArE This tares the measured value subtracting a fixed amount from all subsequent measurements while the Tare function is active Th
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