Related Manuals for LAUREL LT Series
Summary of Contents for LAUREL LT Series
- Page 1 LT SERIES TRANSMITTERS PULSE INPUTS 4-20 MA OUTPUT & RS232 / RS485 I/O USER MANUAL LAUREL Electronics Inc. 3183-G Airway Ave, Costa Mesa, CA, 92626, USA Tel: (714) 434-6131 Fax: (714) 434-3766 Website: www.laurels.com...
-
Page 2: Ordering Guide
1. ORDERING GUIDE Configure a model number in this format: LT60VF1, CBL04 Transmitter Type VF1 ....... 4-20 mA Process Input VF2 ....... .. 0-1 mA Process Input LT ... Pulse input transmitter with 4-20 mA, 0-20 VF3 ........0-10V Process Input mA, 0-10V or -10V to +10V isolated analog VF4 .......... -
Page 3: Table Of Contents
INPUT SIGNAL FILTERING ....................41 TRANSMITTER CALIBRATION ..................42 CUSTOM CURVE LINEARIZATION ..................43 MODBUS PROTOCOL TRANSMITTER COMMUNICATIONS ..........44 CUSTOM ASCII PROTOCOL TRANSMITTER COMMUNICATIONS ........49 SPECIFICATIONS, LT SERIES PULSE INPUT TRANSMITTERS ......... 54 WARRANTY ........................56 - 3 -... -
Page 4: Product Overview
LT Series transmitters duplicate the signal conditioning and signal processing features of their 1/8 DIN panel-mounted counter / timer counterparts for exceptional accuracy at high read rate. A wide range of counter / timer functions are accommodated by three signal conditioners: •... -
Page 5: Receiving & Unpacking Your Transmitter
4. RECEIVING & UNPACKING YOUR TRANSMITTER Your transmitter was carefully tested and inspected prior to shipment. Should the transmitter be damaged in shipment, notify the freight carrier immediately. In the event the transmitter is not configured as ordered or is inoperable, return it to the place of purchase for repair or replacement. Please include a detailed description of the problem. -
Page 6: Transmitter Field Wiring
6. TRANSMITTER FIELD WIRING - 6 -... - Page 7 P6 - SIGNAL INPUT DETAIL DUAL CHANNEL PULSE SIGNAL INPUT PROCESS / TOTALIZER SIGNAL INPUT DC & Externally Powered Process Single Powered Sensor Input Excitation return 1 Excitation return 1 Power to sensor + Excitation 2 + Excitation 2 - Signal input 3 +B Signal Input 3 + Signal input 4 Signal Ground 4...
-
Page 8: Programming Your Transmitter
7. PROGRAMMING YOUR TRANSMITTER Our transmitters are easily programmed using a PC and Instrument Setup (IS) Software, which provides a graphical user interface. The software allows uploading, editing, downloading and saving of setup data, execution of commands under computer control, listing, plotting and graphing of data, and computer prompted calibration. - Page 9 In the Establish Communications screen, select your Com Port and 9600 as the Baud Rate. You In the Establish Communications screen, In the Establish Communications screen, In the Establish Communications screen, will be able to change your protocol and baud rate later under the Communication setup tab. Click on Establish, and the two fields at the bottom of the screen should turn green.
- Page 10 To get to the Input+Display tab To get to the Input+Display tab, , , , click on Counter => Get Setup to retrieve the current setup To get to the To get to the Input+Display tab Input+Display tab information from your counter transmitter, then on View => Setup, which will take you to the Input+Display tab.
- Page 11 Click on the Scaling tab Click on the Scaling tab to scale your transmitter. You will normally be given the choice of two Click on the Scaling tab Click on the Scaling tab scaling methods: 1) direct entry of Scale and Offset, and 2) the Coordinates of 2 Points me- thod, where (Low In, Low Read) and (High In, High Read) data points are entered numerically.
- Page 12 Click on the Relay Alarms tab Click on the Relay Alarms tab to set up your transmitter’s two solid state relays, which are Click on the Relay Alarms tab Click on the Relay Alarms tab standard. Press the F1 key F1 key for context-sensitive help with any item.
- Page 13 Click on the Analog Out tab Click on the Analog Out tab to scale your analog output, which is standard. Under Range, select Click on the Analog Out tab Click on the Analog Out tab 0-20 mA Current, 0-10V Voltage, or 4-20 mA. Enter your “Lo Range Reading” and “Hi Range Reading”...
- Page 14 Plot Plot Plot Plot Graph Graph Graph Graph - 14 -...
-
Page 15: Opening Your Transmitter Case
8. OPENING YOUR TRANSMITTER CASE WHEN TO CHANGE JUMPERS Your transmitter case does not need to be opened if jumpers have already been set by your distributor. Otherwise you will need to open the case and either set jumpers or verify that the factory default jumpers positions will meet your needs. -
Page 16: Dual Channel Pulse Or Ac Input Signal Conditioner Board
9. DUAL CHANNEL PULSE SIGNAL CONDITIONER BOARD The same signal conditioner board is used for the frequency, rate, period, timing, phase angle, or duty cycle functions. The board needs to be configured via jumpers for the input signal type and level. It is recognized by Instrument Setup software, which will bring up the applicable menu items for the Input Option “Dual Sig Cond.”... - Page 17 Function Block Jumper Setting Frequency Response A0 & B0 - 1 MHz max 30 kHz max 250 Hz max Bias Resistor A1 & B1 a 10 kOhm pull-up to 5V 10 kOhm pull-down to -5V Contact Debounce A4 & B4 b None a, c 3 msec...
-
Page 18: Rate & Frequency Modes
9.1 RATE & FREQUENCY MODES Frequency in Hz is determined by timing an integral number of pulses over a user-specified Gate Time from 0 to 199.99 sec and taking the inverse of average period. The typical internal display update rate is Gate Time + 1 period + 30 ms. Selecting a longer Gate Time produces a more stable reading as more cycles are averaged, but slows down the update rate. - Page 19 Example 1: Transmit frequency in Hz with 1 Hz resolution Application: Transmit digital frequency readings f from 1 Hz to 999999 Hz with no decimal point, update rate of 4/sec, and adaptive moving average filter for 0.4 sec. Set analog output to 0V at 0 Hz and 10V at 25 kHz.
- Page 20 Example 2: Transmit rate as 0-100.00 for a 10 kHz to 11 kHz input Application: Transmit 0.00 to 100.00 (with two decimal places) for a 10 kHz to 11 kHz frequency input. Set analog output to 4-20 mA for this range. Solution: •...
- Page 21 Example 3: Transmit rate in GPM from 36.67 pulse/gallon turbine flow meter Application: Transmit rate in gallons per minute with three decimal places from a turbine flow meter with a K factor of 36.67 pulses per gallon. Set analog output to 4 mA at 0 GPM and 20 mA at 30 GPM.
- Page 22 Example 4: Transmit rate of fuel consumptions in liters/km and drive a 0-10V meter Application: Transmit a ship’s rate of fuel consumption to two decimal places in liters/km and display fuel consumption from 0-100 liters/km on a 0-10V analog meter. Fuel flow is measured using a turbine flow meter with a K factor of 5.126 pulses/liter.
-
Page 23: Period Modes
Inverse of frequency. Native counts are microseconds, so scale appropriately. 9.2 PERIOD MODES: 9.3 TOTAL MODES Total A, B determines Total independently for Channel A (Item #1) and Channel B (Item #2). • Either item can be selected for the analog output. •... - Page 24 Example 1: Transmit volume in gallons from a 36.67 pulse/gallon flow meter Application: Digitally transmit volume in gallons with two decimal places from a flow meter with a K factor of 36.67 pulses/gallon. Also transmit 4-20 mA corresponding to 0-50 gallons. Solution: •...
- Page 25 Example 2: Transmit simultaneous rate & total from a 36.67 pulse/gallon flow meter Application: Digitally transmit rate in gallons/minute with two decimal places from a flow meter with a K factor of 36.67 pulses/gallon, also display volume in gallons with no decimal point. Solution: •...
- Page 26 Example 3: Transmit total volume by adding two flow meter channels Application: Digitally transmit total volume in gallons to two decimal places from two pipes dispensing liquids into the same tank. Flow meter A is calibrated to 36.67 pulses/gallon, flow meter B to 58.12 pulses/gallon.
-
Page 27: Timing Modes
9.4 TIMING MODES Time Interval A to B determines the time between periodic inputs on Channels A and B. • Timing starts when a pulse is applied to Channel A (positive edge if slope A is 0, negative edge if slope A is 1), and ends when a pulse is applied to Channel B (positive edge if slope B is 0, negative edge if slope B is 1). - Page 28 Example 1: Transmit machine run time with 0.00 hour resolution Application: Track two machine run times in hours. Channel A time will have two decimals, will be per job for billing purposes, and will be reset at end of each job. Channel B time will have no decimals, will be total accumulated hours for machine maintenance purposes, and will be reset following maintenance.
- Page 29 Example 2: Transmit relay closing time in msec with 0.001 msec resolution Application: Transmit closing time of a relay in msec with 0.001 msec resolution using stop- watch mode. Also transmit relay closing time from 0 to 200 msec as a 4-20 mA signal. Solution: •...
-
Page 30: Phase Angle
9.5 PHASE ANGLE (Extended main board). Phase A to B (0-360) measures the phase difference between signals of the same period • applied to Channels A and B over a span from 0° to 360°. Select this span if no negative readings are expected. -
Page 31: Power Factor
9.6 POWER FACTOR (Extended main board). Power factor of an AC power system is the ratio of real power in watts (W) divided by apparent power in volt-amperes (VA). For sinusoidal signals, power factor is calculated from phase angle θ as cos(θ). Power factor readings can range from 1.000 to 0.000 with three decimal places and an accuracy of 0.1% for sinusoidal signals at 50/60 Hz. -
Page 32: Duty Cycle
9.7 DUTY CYCLE (Extended main board) Duty Cycle (A to B)/A measures On or Off period as a percentage of total period over a Gate Time which is selectable up to 199.99 s. The same signal is applied to Channels A and B. Time is measured between positive and negative edges of the signal, with averaging over multiple integral periods over the selected Gate Time. -
Page 33: V-To-F Converter Signal Conditioner Board
10. V-TO F CONVERTER SIGNAL CONDITIONER BOARD The process receiver signal conditioner board converts 0-1 mA, 4-20 mA or 0-10 V analog process signals to a frequency signal, which is then processed mathematically by the counter main board to produce an internal reading of rate, total (time x rate), or 1/rate (time based on rate). - Page 34 Example of rate and volume from a 4-20 mA flow meter Application: Transmit flow rate in GPM to three decimals and totalized volume in gallons to two places from a 4-20 mA flow meter calibrated so that 4 mA = 0 GPM and 20 mA = 18.756 GPM. Do not totalize reported flow rates below 0.050 GPM, as these are deemed to be noise.
-
Page 35: Quadrature Signal Conditioner Board
11. QUADRATURE SIGNAL CONDITIONER BOARD The quadrature signal conditioner can be used for position (Basic or Extended main board) or for position or rate (Extended main board). Two quadrature signals, which are 90º out of phase, are applied to Channel A and B inputs. Their phase relationship determines whether the count is clockwise (+) or counterclockwise (-). - Page 36 Phase for Up Count A positive, negative B transition (A leads B) none A positive, positive B transition (B leads A) Count-by Options X1 = positive edge of A input none X2 = positive & negative edges of A input X4 = positive &...
- Page 37 Example of rate in feet/sec from a 1024 pulse/revolution quadrature encoder Application: Transmit rate in feet/sec with 3 decimals using a 1024 pulse/revolution quadrature encoder tied to a roller with 1.782 ft circumference. Have 4 updates/sec. Solution: • Under Input+Display tab, set Signal Input Mode to Quadrature, Function to Rate, Gate Time to 0.22 sec, and Time Out to 1.00 sec.
-
Page 38: Main Board Jumper Settings
12. MAIN BOARD JUMPER SETTINGS Serial Signal Duplex Jumpers Termination Resistor* E6 a = Transmit Full None E6 c = Receive RS485 Half E6 b + d** E6 c RS232 Full None None The termination resistor jumper settings should only be selected if the transmitter is the last device on an RS485 line longer than 200 feet (60 m). -
Page 39: Dual Relay Operation
13. DUAL RELAY OPERATION Dual AC/DC solid state relays rated 120 mA are standard for alarm or setpoint control and are independently set up via the “Relay Alarms” tab of Instrument Setup Software. For online help with any data entry field, press the F1 key. •... - Page 40 • Deviation. A positive number that can be added or subtracted from the setpoint, depending on the Deviation Type, to determine when an alarm becomes Active or Inactive. • Alarm Source. Depending on the Signal Input Mode and Function selected under the Input+ Display tab, the alarm can be assigned to any of up to three Items, for example to Item 1 (A rate / B rate), Item 2 (A rate), or Item 3 (B rate).
-
Page 41: Input Signal Filtering
• Alarm Type. Selections are Non-Latching and Latching. Under Non-Latching, the relay is only closed (or open) while the Alarm State is Active. Under Latching, the activated relay remains closed (or opens) until reset regardless of the Alarm State. Resetting is normally achieved by temporarily grounding one of the transmitter’s control inputs, which has been set to Function Reset under the “Input+Display”... -
Page 42: Transmitter Calibration
15. TRANSMITTER CALIBRATION All ranges of our transmitters have been digitally calibrated at the factory prior to shipment using computers and calibration equipment certified to NIST standards. If recalibration is required, your transmitter may be returned to the factory or to an authorized distributor. The counter main board contains an EEPROM, which stores calibration constants for the quartz crystal oscillator and the analog output. -
Page 43: Custom Curve Linearization
16. CUSTOM CURVE LINEARIZATION Curve.exe is a DOS-based, executable PC program used to set up an Extended transmitter so that the analog output and internal digital readings have a user-defined, non-linear relationship with the input signal. The calculated linearizing parameters are downloaded into non-volatile memory of the transmitter. -
Page 44: Modbus Protocol Transmitter Communications
17. MODBUS PROTOCOL TRANSMITTER COMMUNICATIONS 1.0 GENERAL The Modbus capability conforms to the Modbus over Serial Line Specification & Implemen- tation guide, V1.0. Both the Modbus RTU and Modbus ASCII protocols are implemented. This 5-page manual section presents key programmable Modbus features. Our detailed Modbus manual can be downloaded from http://www.laurels.com/downloadfiles/modbus.pdf http://www.laurels.com/downloadfiles/modbus.pdf http://www.laurels.com/downloadfiles/modbus.pdf... - Page 45 4.0 COMMUNICATIONS SETUP Parameters selectable via Instrument Setup software, distributed on CD ROM: Serial Protocol ....... Custom ASCII, Modbus RTU, Modbus ASCII Modbus ASCII Gap Timeout ... 1 sec, 3 sec, 5 sec, 10 sec Baud Rate ........300, 600, 1200, 2400, 4800, 9600, 19200 Parity ..........
- Page 46 FC08: Diagnostics Checks communications between the Master and Slave, and returns the count in the Modbus Slave counters (which are reset when the meter is reset). Hex Sub Data Response Function Description Send Data Code 00 00 Same Returns Query Data (N x 2 bytes). Echo Request. as sent 00 01 Restarts Communications.
- Page 47 6.0 SUPPORTED EXCEPTION RESPONSE CODES Code Name Error Description ---- -------------------- ------------------------------------------------------ Illegal Function Illegal Function Code for this Slave. Only hex Function Codes 03, 04, 05, 08, 10 (dec 16) are allowed. Illegal Data Address Illegal Register Address for this Slave. Illegal Data Value Illegal data value or data length for the Modbus protocol.
- Page 48 Modbus ASCII Format Byte Number Action Request Response Request Response Request Response Request Response Request LRC CR Response Exception EC LRC CR Response DD* = (DD DD) times NR (Number of Registers) 8.0 MESSAGE EXAMPLES All examples are for Transmitter Address = 01 and No Parity. Modbus RTU Modbus ASCII Ser_4 ->...
-
Page 49: Custom Ascii Protocol Transmitter Communications
18. CUSTOM ASCII PROTOCOL TRANSMITTER COMMUNICATIONS SERIAL COMMUNICATION FORMAT Mode ....Full Duplex (Separate transmit and receive lines) and Half Duplex (RS485 only) Baud Rate ..300, 600, 1200, 2400, 4800, 9600, 19200 selectable with Instrument Setup software. Parity ....None Word length .. - Page 50 Values are transmitted in a continuous string with no intervening spaces. If the 5th digit in is set to 1 using Instrument Setup software, the termination characters of <CR> and optional <LF> appear after each value. If the 5th digit is et to 0, the termination characters appear only once at the end of the string.
- Page 51 Char # Character Description Command Identifier. Recognition Character. Device Address. 0 addresses all devices, 1-V specific devices. Command Function Sub-command. Number of Bytes of RAM or Words (2 Bytes) of non-volatile memory data being transferred. CHAR 2 - Address Codes A Serial Communications Address Code from 1 to V follows the “*”...
- Page 52 Peak value reset *1C3 Remote display reset *1C4 Valley reset *1C9 Tare function *1CA Tare reset *1CB READING AND WRITING TO RAM AND NONVOLATILE MEMORY CHAR 1, 2 The Recognition character and Meter Address Code are the same as shown in previous table. CHAR 3 Command character: Read bytes from RAM Memory...
- Page 53 General, Reading and Writing Ram Memory Data RAM memory data is read and written as a continuous string of bytes consisting of 2 hex characters (0-9,A-F) per byte. Included in the command are the total number of bytes to be transferred and the most significant address in RAM of the continuous string of bytes.
-
Page 54: Specifications, Lt Series Pulse Input Transmitters
19. LT SERIES PULSE INPUT TRANSMITTER SPECIFICATIONS Mechanical Case Dimensions ..................120 x 101 x 22.5 mm Case Mounting ................35 mm DIN rail per EN 50022 Electrical Connections............. Detachable screw plug connectors Environmental Operating Temperature ....................0°C to 55°C Storage Temperature .................... - Page 55 DUAL CHANNEL SIGNAL CONDITIONER Crystal Accuracy at 25ºC ....................±2 ppm Crystal Tempco ....................±1 ppm/degree C Long-Term Drift of Crystal ..................±5 ppm/year Signal Types ....AC, NPN, PNP transistor outputs, contact closures, magnetic pickups Max Pulse Rate ............1 MHz on Channel A, 250 kHz on Channel B Channel Isolation ..........Channel A &...
-
Page 56: Warranty
In the event of a defect during the warranty period, the unit should be returned, freight prepaid (and all duties and taxes) by the Buyer, to the authorized Laurel distributor where the unit was purchased. The distributor, at its option, will repair or replace the defective unit. The unit will be returned to the buyer with freight charges prepaid by the distributor.