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Summary of Contents for Presys LC-505
- Page 1 Presys Instruments LC-505 Loop Calibrator TECHNICAL MANUAL...
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Page 2: Important Instructions
EM0057-01 IMPORTANT INSTRUCTIONS: Keep LC-505 calibrator in a dry environment whenever possible. It can be put in a burn-in up to 50ºC when it is a long time out of use. The fuse which protects the current measurement circuit, code 01.02.0277-21, is a special part. -
Page 3: Table Of Contents
2 - Operation ....................... 6 2.1. Parts Identification ..................6 2.2. Battery and charger ..................9 2.3. Using LC-505, basic functions ..............10 2.4. Measurement or Input Functions ..............13 2.5. Generation or output functions ..............15 2.6. Available power supply (TPS) ..............17 2.7. - Page 4 2.9.2. CAL Function ..................31 2.9.3. SCALE Function ................34 2.9.4. CONV Function ................. 36 2.10. MEM Command ..................38 2.11. LC-505 Warning Messages ............... 40 3 - Calibration and Maintenance ................41 3.1. Input Calibration................... 43 3.2. Output Calibration ..................44...
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Page 5: Introduction
1 - Introduction 1 1. General Description LC-505 calibrator enables measurement and generation of signals used in DC current (4-20mA) and voltage (1-5V, 0-10V) loops. Distinguished from regular loop calibrators due to its high-accuracy, possibility of simultaneous measurement and generation of isolated signals, real time connection with computer, working as a data acquisition point and full computer-aid for instrument calibration and adjustment tasks. - Page 6 Page 2 applicable. Moreover, various other constructive features aggregate quality and efficiency to LC-505, allowing also its field and workbench use. Incorporates the most modern concepts of calibration and adjustment via computer, where data are shared between instrument and computer, improving efficiency in handling...
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Page 7: Specifications - Inputs
Page 3 1.2. Specifications - Inputs Input Ranges Resolution Accuracy Remarks 0.02% FS volt -10 to 11 V 0.0001 V > 1 M input 0.02% FS 11 to 45 V 0.0001 V 0.01 % FS < 160 -5 to 24.5 mA 0.0001 mA input... - Page 8 Page 4 Accuracy values are valid within one year and ambient temperature range from 20 to 26 °C. Outside these limits add 0.001 % FS / °C, taking 23 °C as the reference temperature. Special Software Functions - Any output programmable in: 1) STEP: 10%, 20%, 25% or up to 11 programmable set-points via key or adjustable time.
- Page 9 Page 5 Transmitter power supply: 23 Vdc, 30 mA, regulated. Warm-up time: 5 minutes. Operating temperature range: 0 to 50 ºC. Relative humidity: 90% RH non-condensing. Battery operation: - Up to 8 hours when generating mA (20 mA) or using 2-wire power supply; Up to 36 using only inputs.
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Page 10: Operation
Page 6 2 - Operation 2.1. Parts Identification a - Front panel... - Page 11 Page 7 b - Left side-view panel c - Right side-view panel...
- Page 12 Page 8 d - Carrying case, way of use e - Accessories: The carrying case has two compartments, one is used to house the calibrator and the other is used to keep several accessories such as test leads, spare fuse, straps for transport and use in field, and also the technical manual.
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Page 13: Battery And Charger
2.2. Battery and charger LC-505 is supplied with rechargeable battery which enables up to 36 hours of continuous use, or less, mainly when the 4-20 mA output or the 23 Vdc power supply for transmitters is used. -
Page 14: Using Lc-505, Basic Functions
RAM error or E2PROM error; if that occurs, contact Presys Technical Assistance. The battery voltage is constantly monitored and the low battery warning is... - Page 15 EXEC - used to activate an input or output option which has been previously selected. CONF - takes to the sub-menu: OFF DATE OFF - LC-505 incorporates energy saving resources (battery) through the automatic power off option (auto-OFF). This option has the following sub-menu:...
- Page 16 30MIN When NO is selected, the energy saving option is disabled. In case 5, 15 or 30 min is selected, LC-505 will turn off automatically after this period if the keyboard is not used. DATE - updates the date and time for LC-505. Thus, when LC-505 performs a calibration within the COMMUNICATION option, calibration data is recorded together with their date and time of occurence.
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Page 17: Low Battery
LCD performs the setting of the display contrast by means of the arrow keys the last selection is saved by pressing the ENTER key. PRG, FN, MEM are resources of LC-505 described further on. 2.4. Measurement or Input Functions Select the type of signal to be measured by using the menus and use the corresponding terminals: IN - Selects the input function. - Page 18 Page 14 In = x.xxx V Display indicates volt input with large digits. C/CE Returns to the previous menu. Disables the input function. Input or measurement connections...
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Page 19: Generation Or Output Functions
Page 15 2.5. Generation or output functions Select through the menus the type of signal to be generated and use the corresponding terminals. Selects the output functions. Press ENTER to select V (volt) V source; press to select another signal. OUT = x.xxxx V Display indicates the value of the output in volts with large digits. - Page 20 Page 16 Output or generation connections...
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Page 21: Available Power Supply (Tps)
Page 17 2.6. Available power supply (TPS) LC-505 has a +23 Vdc regulated power supply (TPS), with short-circuit protection (current limited to 30 mA). -
Page 22: Application Examples
Despite its capability of showing simultaneously input and output functions in the display, there is no isolation between each other. This means that when LC-505 is connected to a converter (I / V, V / I, I / I or V / V) it may not function appropriately or damage the set, in case the converter is not galvanically isolated. - Page 23 Page 19 a) Calibration of four-wire transmitters...
- Page 24 Page 20 b) Calibration of two-wire transmitter...
- Page 25 Page 21 c) Current supply...
- Page 26 Page 22 d) Two-wire transmitter simulation (XTR)
- Page 27 Page 23 e) I / V converter (isolated)
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Page 28: Special Programming
Page 24 2.8. Special Programming When PRG is selected, the display will show: INPUT OUTPUT This option allows the selection of special programming features for INPUT or OUTPUT. INPUT is provided with FILTER, DECIMAL and SPEED options. OUTPUT is provided with STEP and RAMP options. -
Page 29: Decimal Programming
2.8.3. STEP Programming The STEP programming makes LC-505 output vary in pre-defined steps. It is useful in calibrations where certain scale points are verified; for example 0% - 25% - 50% - 75% - 100%. - Page 30 Page 26 The type of output must be previously configured, otherwise the message: SELECT OUTPUT FIRST will be displayed. In this case, press C/CE to go back to the main menu and select the output type. After the selection of the step variation percentage is completed, the start and the end values of the range within which the output will travel (Set-point High and Low) are asked.
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Page 31: Ramp Programming
Page 27 2.8.4. RAMP Programming By using this programming, LC-505 output varies automatically, thus producing ramps and level marks which may be programmed to actuate once or continuously. From the main menu, select CONF (ENTER), PRG (ENTER) and RAMP (ENTER). -
Page 32: Special Functions
Page 28 2.9. Special Functions By selecting FN, the display will show: INPUT OUTPUT With these options, you may select special functions related to the INPUT or the OUTPUT. INPUT has the SCALE, CAL and NO options. -
Page 33: Scale Function
Page 29 2.9.1. SCALE Function It establishes a linear relationship between LC-505 input signal and what is shown at the display, according to the graphic below. - Page 34 Page 30 The number of decimals (up to 4) shown on the display may be configured by using Scale Dec parameter. The value for Input High must be necessarily higher than Input Low. On the other hand, Scale High and Scale Low may have any relationship between themselves: higher than, lower than or equal to, and they may have a sign before them.
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Page 35: Cal Function
LC-505 voltage input may be displayed in the same unit of the generated signal, that is, current unit. Thus, both readings of LC-505 input and output are scaled in current unit,... - Page 36 Page 32 To activate this LC-505 function, just fill the four parameters shown in the graphic below. To access these parameters press ENTER after CAL is indicated in the display.
- Page 37 Page 33 Note that when CAL function is active, the display will indicate CAL instead of IN, as illustrated below: CAL = 12.1000 psi OUT = 12.0000 psi To disable SCALE or CAL functions, just select NO option from the menu below and press ENTER.
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Page 38: Scale Function
Page 34 2.9.3. SCALE Function The scaling of LC-505 output allows it to simulate the functioning of a transmitter. Transmitter input is made directly by keyboard, and one can get voltage or current output signal. SCALE output function relates the output signal generated by LC-505 to the value... - Page 39 Page 35 Scale Dec parameter configures the number of decimals presented at the display. The value of Output High must always be higher than Output Low. Scale Low and Scale High parameters can have any relationship between them, provided that they are different.
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Page 40: Conv Function
It may therefore behave as a non-isolated converter. Once LC-505 input and output have been selected, you must fill in the four parameters shown in the graphic below. To access these parameters press ENTER after CONV is... - Page 41 Page 37 The value of Output High must always be higher than Output Low. Input High and Input Low parameters must never be equal. Thus, any type of direct or reverse retransmission from input to output can be obtained. SCALE and CONV functions can be disabled by selecting the NO option and pressing ENTER, as shown below: ...
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Page 42: Mem Command
In this case, storing these configurations in the calibrator saves time. One can have up to eight sequences stored in memory. After making a specific operation in LC-505 through the keyboard, return to the menu that shows MEM. Then select MEM and press ENTER. The display will show: ... - Page 43 The numbers shown above represent eight locations of memory. Select any of them and press ENTER. LC-505 configuration is then stored in the chosen memory. In order to call it, even though LC-505 has been turned off and on, select RECALL (ENTER) and the memory number that stored the previous configuration.
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Page 44: Lc-505 Warning Messages
Page 40 2.11. LC-505 Warning Messages Warning Meaning Procedure RAM ERROR Problem in Turn LC-505 off and on. READ MANUAL RAM memory If the error persists, contact EEPROM ERROR Problem in EEPROM Presys technical assistance READ MANUAL memory mA output... -
Page 45: Calibration And Maintenance
Page 41 3 - Calibration and Maintenance Warning: Enter the following options only after understanding them completely. Otherwise, it may be necessary to return the instrument to the factory for adjustment! In this manual, Calibration means Adjustment. Select CAL option from the main menu and press ENTER. Then enter the PASSWORD 9875 to access the calibration menu. - Page 46 Page 42 You should then choose whether the calibration is to be performed over an input range (IN) or an output range (OUT). DATE is an option which allows you to record the date on which the calibration is performed and once it has been filled in, it will be displayed every time the instrument is turned on.
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Page 47: Input Calibration
When calibrating inputs, the display shows on the 2 line the value measured by LC-505 and on the 1st line the same value is expressed as a percentage. Note that the applied signals just need to be close to the values shown in the table. -
Page 48: Output Calibration
3.2. Output Calibration Select the corresponding mnemonic, choose the setpoint as explained as follows, measure the signal generated by LC-505 and store this value as detailed in the following tables. For calibration of outputs, the display shows three kinds of information: SP = 50.000% (1) - Page 49 Page 45 Field (3) is the value entered by the user after the output has been measured and the values corresponding to the two setpoints have been stored: 1 point (key 1) and 2 point (key 2). Press the key “0” to select the setpoint. V output 1st point 2nd point...
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Page 50: Replacement Of Current Input Fuse
4) Identify the glass fuse as illustrated in the figure below; 5) Replace the damaged fuse by the spare fuse (LC-505 carrying case). The fuse of LC-505 has special characteristics. Thus, use only the 32 mA fuse provided, code 01.02.0277-21. - Page 51 Page 47...
- Page 52 The minimum warm-up for adjustment is two hours. LC-505 power supply must be disconnected from the battery charger during adjustment. It is recommended that calibration standards presented to LC-505 during adjustment have accuracy at least 3 times better than the accuracy values provided...
- Page 56 Presys Presys | Instruments Inc. www.presys.com.br...
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