AMALGAMATED INSTRUMENT LD4-LN Operation And Instruction Manual
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AMALGAMATED INSTRUMENT LD4-LN Operation And Instruction Manual

Large digit display dc current / dc voltage 50 point lineariser
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AMALGAMATED INSTRUMENT CO PTY LTD
Unit 5, 28 Leighton Place Hornsby
NSW
2077 AUSTRALIA
Large Digit Display
DC Current / DC Voltage
50 Point Lineariser
Operation and Instruction Manual
(Inputs 0-20mA, 4-20mA, 0-100mV,
0-1V, 0-10V or 0-100V)
Telephone:
Facsimile:
LD4-LN
+61 2 9476 2244
+61 2 9476 2902
ACN: 001 589 439
e-mail: sales@aicpl.com.au
Internet: www.aicpl.com.au

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  • Page 1 DC Current / DC Voltage 50 Point Lineariser Operation and Instruction Manual (Inputs 0-20mA, 4-20mA, 0-100mV, 0-1V, 0-10V or 0-100V) AMALGAMATED INSTRUMENT CO PTY LTD ACN: 001 589 439 Unit 5, 28 Leighton Place Hornsby Telephone: +61 2 9476 2244 e-mail: sales@aicpl.com.au...

  • Page 2: Table Of Contents

    Table of Contents Introduction ........3 Mechanical Installation.

  • Page 3: Introduction

    Monitor. The LD4 is a general purpose instrument which may be configured to accept an input of 0 to 20mA, 4 to 20mA, ±100mV, ±1V, ±10V or ±100VDC. The LD4-LN offers the choice of linear, square root or linearised display.

  • Page 4: Mechanical Installation

    Mechanical Installation The instrument is designed be wall mounted. Carefully measure and drill holes, as shown below. All sizes are in mm. Mounting hole diameters are 6.5mm. 57mm 4 digit display An optional panel mount kit is available for the 57mm type display. Panel cut out size is 240 x 130mm 5 @ 6 3 (-0.0mm/+0.5mm)

  • Page 5: Electrical Installation

    Electrical Installation The LD4-LN instrument is designed for continuous operation and no power switch is fitted to the unit. It is recommended that an external switch and fuse be provided to allow the unit to be removed for servicing. The terminal blocks, which are the plug in type for ease of installation, allow for wires of up to 1.5mm 2 (2.5mm 2 for relay and power connections) to be fitted.

  • Page 6: Power Supply Connections

    3 .1 Power supply connections Mains power connections (240VAC or 110VAC) are made via a plug in terminal with screw connections. LARGE DIGIT POWER SUPPLY SERIAL NO. TRANSFORMER AC OUTPUT SOCKET AC MAINS E N A SOCKET FOR 240/110V PLUG IN MAINS CONNECTOR TRANSFORMER The transformer low voltage AC output goes to the power supply connector P1 on the main circuit...

  • Page 7: Input/Output Connectors

    3 .3 Input/output connectors INPUT EXCITATION The diagram shows the input/output connectors for the LD4-LN. The input signal connection is between INPUT + and INPUT -. The standard 18VDC unregulated transmitter supply output is between INPUT - and EXCITATION UN REG.
  • Page 8 4. 2 wire 4-20mA input - powered from standard 18VDC supply (AC powered models only) INPUT EXCITATION PLUG IN AFTER WIRING SENSOR Shield 5. 3 wire ±20mA or 4-20mA input - powered from standard 18VDC supply (AC powered models only) INPUT EXCITATION PLUG IN AFTER WIRING...

  • Page 9: Input Type Selector Links

    LK10 LK10 3 .5 Remote input connector The LD4-LN has a software function named R.INP or remote input. LATCHING OR Closure of the remote input connector via a switch or relay contact will cause MOMENTARY the selected remote input function to operate. Choose the switch type to suit ACTION SWITCH the remote input required e.g.

  • Page 10: Explanation Of Functions

    Explanation of Functions The LD4 setup and calibration functions are configured through a push button sequence. Two levels of access are provided for setting up and calibrating:- FUNC mode (simple push button sequence) allows access to commonly set up functions such as alarm setpoints.
  • Page 11 The alarm and brightness functions below are accessible via FUNC mode. The LD4-LN has an easy alarm access facility which allows access to the alarm setpoints simply by pressing the F button. The first setpoint will then appear and changes to this setpoint may be made to this setpoint via the ^ or v buttons.
  • Page 12 A1Hi (alarm high setpoint) Displays and sets the high setpoint value for alarm 1 relay. The high alarm setpoint may be disabled by pressing the ^ and v pushbuttons simultaneously. When the alarm is disabled the display will indicate OFF. Use ^ or v to adjust the setpoint value if required. The alarm will activate when the displayed value is higher than the A1Hi setpoint value.
  • Page 13 A1n.o or A1n.c (alarm x normally open or normally closed) Displays and sets the setpoint alarm relay action to normally open (de-energised) or normally closed (energised), when no alarm condition is present. A normally closed alarm is often used to provide a power failure alarm indication.
  • Page 14 Trailing Alarm Table Showing Possible Alarm Assignments A2.t1 A3.t1 a4.t1 A3.t2 A4.t2 a4.t3 brgt (display brightness) Displays and sets the digital display brightness. The display brightness is selectable from 1 to 15, where 1 = lowest intensity and 15 = highest intensity. This function is useful for improving the display readability in dark areas or to reduce the power consumption of the instrument.

  • Page 15: Calibration Functions

    4 .1 Calibration functions. The CAL 1 and CAL 2 functions described below allow the display to be scaled to read in engineering units using “live” inputs. For 4-20mA inputs and alternative method which does not require “live” inputs may be used, see the UsER En4 and USER En20 functions which follow.
  • Page 16 Example - Scaling using two live inputs Enter via mode, If the "live" display is stable see page 11 press the button. The SCL2 message will be seen Place at the input a low level Use the button to signal for which the required enter the required scale value scaling value is known e.g.
  • Page 17 ZERO RNGE (zero range) The zero range function allows a limit value to be set (in engineering units) above which the display will not zero i.e. if a zero operation is attempted via the P button, remote input or set zero function when the display value is greater than the zero range setting the display will refuse to zero and give a ZERORNGEErr message (note that the CAL OFSt function is also affected by the ZERO RNGE setting).
  • Page 18 P.but (P button function) The P button may be set to operate some of the remote input functions, see R.INP below for a description of these functions. If both the remote input and P button function are operated simultaneously the P button will override the remote input. The functions below are as described in the R.INP function above with the exception of the P.SEt function.

  • Page 19: Lineariser Functions

    Nett FLSH (nett value display mode) The nett value is only seen when the remote input or P button is set to tARE. The NEtt FLSH function can be set to on or OFF. If set to on then the message NEtt will flash briefly approximately every 6 seconds when the operator toggles to a nett display to remind the operator that a nett value is being viewed.
  • Page 20 Y values to be entered into the lineariser table must be either calculated or measured via a live input. Refer to the “Example” later in this chapter for an example of creating a lineariser table using live inputs. tAbL (lineariser on or off) Allows the lineariser to be switched on (on) or off (OFF).
  • Page 21 A pressure transmitter with a 4-20mA output is installed near the base of an irregularly shaped tank, see diagram below, which contains a liquid. The transmitter is connected to a LD4-LN and 10 linearising points are required to measure the number of litres in the tank. The output from the transmitter will be linear between P9 and P10 since the sides of the tank are straight.
  • Page 22 The procedure used is as follows, steps a. to n.: a. All general functions are set as required i.e. display rounding etc. c. Set the tAbL function to on. The SQrt function should be set to OFF. c. Use CAL1 & CAL 2 or USER En4 & USER En20 to scale the PM4 to show 4mA= 4.0, 20mA= 20.0.
  • Page 23 Lo dISP (low overrange limit value) The display can be set to show an overrange message if the display value falls below the Lo dISP setting. For example if Lo dISP is set to 50 then once the display reading falls below 50 the message -or- or the display value (see dISP function) will flash instead of the normal display units.
  • Page 24 this case the alarm can be activated even if the display value is less than the alarm setting, this is because the alarm is activated by the value in peak memory rather than the display value. Example 6 - A1 is set to Lo and R.INP is set to Lo If A1Lo is set to 280 and the valley memory value becomes less than 280 then alarm 1 will be constantly activated at this point and will only become de activated when the memory is reset at a value above 280.

  • Page 25: Error Messages

    4 .3 Error Messages CAL Err - This indicates that one of the calibration points has caused an overrange error in the analog to digital converter. Check the input link settings against the live input then try calibration again. SPAN ERR - This indicates that the calibration points entered were too close together. Try calibrate again with the points further apart.

  • Page 26: Function Table

    Function Table Meaning of Default Record Your Initial display Next display display Setting Settings AxLo Relay low setpoint value Setpoint value or See following table AxHi Relay high setpoint value Setpoint value or See following table Hysteresis value AxHy Alarm relay hysteresis See following table in measured units No of seconds...
  • Page 27 Meaning of Default Record Your Initial display Next display display Setting Settings SPAC A1 , A1-2 etc. Setpoint access SQrt OFF or on Square root operation tAbL on or OFF Lineariser on/off tAbL StOP on or OFF Operation mode at table limits 1, 2, 5, 10, 20, 25, 50, Scaling (rounding) factor for SCLE tbIE...

  • Page 28: Lineariser Table

    Lineariser table Lineariser Table Complete and retain for reference P Value Y Value P Value Y Value (Value to be (Value to be displayed) displayed) Page 28 of 46 LD4LNMAN-1.0-1...

  • Page 29: Analog Pi Control Output

    Analog PI Control Output PI control functions will only be seen if the optional analog output is fitted. The PI (proportional + integral) control output may be configured for proportional only (i.e. integral gain set to 0.000) or proportional + integral control. The control output may be link selected as either a 4-20mA, 0-1VDC or 0-10VDC signal.
  • Page 30 C_Pg (proportional gain) PROCESS The proportional gain is the ratio between the IDEAL change in measured input and change in control PROPORTIONAL GAIN TOO HIGH output. Too much proportional gain will result in SETPOINT instability. Example 1, if the proportional gain is set to 1.000 and the measured input changes by 100% of the span set in C.SPN then the output PROPORTIONAL GAIN...

  • Page 31: Integral Control Output

    C_Po (proportional offset %) The proportional offset is initially used to set the output value when operating the instrument as a proportional only controller. The proportional offset determines what % of the proportional control output will be given when the process value reaches the setpoint value. If set to 0.0 then there will be zero output (e.g. 4mA for a 4-20mA output) when the process value reaches the setpoint value.
  • Page 32 to overshooting and oscillation. An integral gain PROCESS which is too small will slow the time taken to reach the setpoint. The optimum value chosen IDEAL INTEGRAL GAIN will depend on the lag time of the process and TOO HIGH other control settings.
  • Page 33 4. Set the proportional gain C. PG to an arbitrary value e.g. 1.000. 5. Set the proportional offset C. PO to 0.0 (0%). 6. Set the integral gain C. IG to 0.000 (i.e. off). 7. Set the integral high and low limits to an arbitrary value e.g. 20.00. Initialise the control system and monitor the control results.

  • Page 34: Specifications

    Specifications 8 .1 Technical Specifications Input types: Link selectable ±20mA, 4-20mA, ±100mV, ±1V, ±10V or ±100V Impedance: 80Ω (4-20mA or 0-20mA) or 1MΩ (DC Volts) ADC Resolution: 1 in 20,000 Accuracy: 0.1% of full scale when calibrated Sample rate: 4 per second Lineariser table: Selectable from 2 to 50 points (X,Y type) Conversion method:...

  • Page 35: Guarantee And Service

    Guarantee and Service The product supplied with this manual is guaranteed against faulty workmanship for a period of 2 years from the date of dispatch. Our obligation assumed under this guarantee is limited to the replacement of parts which, by our examination, are proved to be defective and have not been misused, carelessly handled, defaced or damaged due to incorrect installation.

  • Page 36: Optional Outputs

    Appendix - Optional outputs This appendix provides information required when an optional output is fitted to the LD4. For details of the optional isolated & regulated transmitter supply refer to the “Electrical Installation” chapter. The three remaining optional outputs are serial communications, analog retransmission or two extra setpoint relays. Note that only one of these three options can be fitted at any time.
  • Page 37 RS232/485 Operation and Commands The RS232/485 interface is user selectable. The modes of operation available are as follows:- diSP - Image Display Mode: In image display mode the display value is sent via RS232/RS485 as raw data in the following format: <ESC>...
  • Page 38 Where: <STX> is Start of Text Character (2 Dec, 02 Hex, ^B ASCII) C is the command character (see following commands) A is the unit address (Range: 32 to 63 Dec, 20 to 3F Hex, “SPACE” to ? ASCII, the address is offset by 32 Dec, 20 Hex) <CR>...
  • Page 39 4. Read Low Alarm Setpoint: <STX>LA<CR>N<CR> e.g. ^BL%^M2^M to read alarm 2 low setpoint value using Telix or similar (address 5). Instructs unit to return value of low alarm setpoint. Format of returned data is: <ACK>LANXYYYY<CR> Where: <ACK> is Acknowledge (6 Dec, 06 Hex) L echo command received ‘L’...
  • Page 40 7. Set High Alarm Setpoint: <STX>hA<CR>N<CR>XYYYY<CR> e.g. ^Bh!^M1^M1000^M to set alarm 1 high setpoint to 1000 using Telix or similar (address 1) Instructs unit to change value of high alarm setpoint. Format of returned data is:- <ACK>hANXYYYY<CR> Where: <ACK> is Acknowledge (6 Dec, 06 Hex) h echo command received ‘h’...
  • Page 41 Host Timing Requirements for RS485 Operation: RS485 operation requires the host to switch the RS485 transceiver to transmit before a command is sent. The instrument is capable or replying after 1 to 2 milliseconds. Therefore the host should switch the RS485 transceiver back to receive mode within 0.5 milliseconds after the last character of the command has been sent to ensure correct operation.

  • Page 42: Modbus Communications

    ‘ Modbus communications This addendum covers the use of Modbus RTU communications when using the LD4 monitor. When using Modbus communications the instrument must be set up electrically for RS232 or RS485 communications and the O.Put function must be set to M.bus. Modbus commands Note: the maximum recommended baud rate is 9600.
  • Page 43 An example of a query to read coils 1 to 4 from the LD4 at address 2 is given below. Field Name Example (Hex) Unit address Function Starting address Hi Starting address Lo Number of points Hi Number of points Lo Error check (LRC or CRC) –...
  • Page 44 Field Name Example (Hex) Unit address Function Byte count Data Hi (register 1) Data Lo (register 1) Data Hi (register 2) Data Lo (register 2) Data Hi (register 3) Data Lo (register 3) Error check (LRC or CRC) – The contents of register 1 is 33 (hex) or 51 (decimal), register 2 is 25 (hex) or 37 (decimal) and register 3 is 17 (hex) or 23 decimal.

  • Page 45: Analog Retransmission Option

    Analog retransmission option This addendum covers instruments with the analog retransmission board. This board allows retransmission of 4 - 20mA, 0-1V or 0-10V selectable via two sets of links. Refer to the main “Explanation of Functions” chapter for details of the functions (rEC_ and rEC~) associated with these outputs and to the Function table for function listing.

  • Page 46: Relay 3 And 4 Option

    Relay 3 and 4 option When the relay 3 and 4 option is fitted two extra relays will be fitted as shown below. These relays have the same specification and setup functions as the standard relays 1 and 2. OPTIONAL RELAY BOARD - PLUGS INTO CONNECTOR P7 ON MAIN BOARD RELAY 3 NORMALLY OPEN RELAY 3 NORMALLY CLOSED...

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