PT PT200M Reference Manual
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PT PT200M Reference Manual

Digital indicator
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  • Page 2 PT Ltd. Disclaimer PT Ltd reserves the right to make changes to the products contained in this manual in order to improve design, performance or reliability. The information in this manual is believed to be accurate in all respects at the time of publication, but is subject to change without notice.

  • Page 3: Table Of Contents

    Reference Manual Rev 1.0 Table of Contents INTRODUCTION ........................3 1.1. Overview ........................3 1.2. Approvals (for trade versions only) ................3 1.3. The Manuals Set ......................4 1.4. Document Conventions....................4 SPECIFICATIONS........................5 INSTALLATION ........................6 3.1. Introduction .........................6 3.2. General Warnings .......................6 3.3. Electrical Safety ......................6 3.4.
  • Page 4 Reference Manual Rev 1.0 7.2. Exiting Full or Safe Setup..................26 7.3. Groups and Items......................26 7.3.1. GRP (Group).....................26 7.3.2. ITM (Item) ....................27 7.4. Setup Menus ......................27 7.4.1. BUILD (Scale Build) ..................27 7.4.2. OPTION (Scale Options) ................28 7.4.3. CAL (Scale Calibration) ................29 7.4.4.

  • Page 5: Introduction

    Reference Manual Rev 1.0 Introduction This instrument is a precision digital indicator using the latest Sigma-Delta A/D technology to ensure fast and accurate weight readings. The setup and calibration of the instrument are digital, with a non-volatile security store for all setup parameters.

  • Page 6: The Manuals Set

    Reference Manual Rev 1.0 1.3. The Manuals Set This manual is part of a set of manuals covering the setup and operation of the instrument. The set includes the following: • Reference Manual - Contains detailed information on calibration and setup. This manual is intended for use by Scale Technicians who are installing the instrument.

  • Page 7: Specifications

    Reference Manual Rev 1.0 Specifications Performance Resolution Up to 30,000 divisions, minimum of 0.25µV/division, 20 updates/second (Trade 4000 divisions at 0.8µV/division) Zero Cancellation 2.0mV/V Span Adjustment 0.1mV/V to 3.0mV/V full scale Stability/Drift Zero: < 0.1µV/°C (+ 8ppm of deadload max) Span <...

  • Page 8: Installation

    Reference Manual Rev 1.0 Installation 3.1. Introduction The following steps are required to set up the indicator. • Inspect indicator to ensure good condition. • Use connection diagrams to wire up load cell, power and auxiliary cables as required. • Use the drill hole template provided for hole locations. •...

  • Page 9: Cable Connections

    Reference Manual Rev 1.0 3.6. Cable Connections All cable connections are made to the rear of the instrument using screwless terminals. Wires must be stripped of insulation by at least 10mm. To install, depress the orange lever beside the terminal required and push wire into the hole. Release the lever and pull gently on the wire to ensure it is securely trapped in the terminal.

  • Page 10: 4-Wire Connection

    Reference Manual Rev 1.0 3.8.2. 4-Wire Connection The minimum connectivity requirements are the connection of four wires (ie. Excitation + and – along with Signal + and –). Internally the instrument has a precision analog switch that can be used to connect the Sense + and – lines directly to the Excitation + and –...

  • Page 11: Auxiliary Connections

    Reference Manual Rev 1.0 3.9. Auxiliary Connections This section provides diagrams to illustrate the terminal connections. 3.9.1. RS-232 Serial • Direct Personal Computer Link (RXD, TXD, GND) Figure 5: RS-232 - Instrument to PC using COM Port (DB9) Figure 6: RS-232 – Instrument to PC using COM Port (DB25) Page 9 003R-618-100...

  • Page 12: Remote Input

    Reference Manual Rev 1.0 • Printer Connections (RXD/TXD, GND and DTR) Figure 7: RS-232 – Instrument to Printer (DB25) • Remote Display (TXD, GND) The remote display documentation should be referred to for connection details. Connect TXD to RXD and GND to GND on the remote display. 3.9.2.

  • Page 13: Outputs

    Reference Manual Rev 1.0 3.9.3. Outputs The output drivers for the instrument are isolated open emitter transistor drives that are capable of driving up to a total of 300mA. This configuration allows for the direct connection of the instrument outputs to most types of PLC. The voltage applied to the COM terminal appears on the output lines (ie.

  • Page 14: Opto-Link (Optional)

    Reference Manual Rev 1.0 3.10. opto-LINK (Optional) A temporary infrared communications link can be established between the instrument and a PC using an optional opto-LINK cable. The optional opto-LINK cable can be used to transfer setup and calibration information from a PC (eg. to be stored for later use and/or transferred to other instruments).

  • Page 15: Connecting Shields

    Reference Manual Rev 1.0 3.11. Connecting Shields To obtain full EMC or for RFI immunity, cable shields MUST be connected to the earth lug on the rear of the instrument. Figure 12 illustrates an example of possible connections. Also shown are the connecting cables restrained using cable ties fastened around the cable strain relief anchors.

  • Page 16: Data Entry

    Reference Manual Rev 1.0 Data Entry Throughout the setup and normal weighing mode, different data entry methods are used. Each method is described below. When using the keypad for normal operation, press the key on keypad to initiate the feature. 4.1.

  • Page 17: Numeric Entry

    Reference Manual Rev 1.0 4.2. Numeric Entry A numeric entry box allows the input of a number. When entering a number, the display will show digits with the currently selected digit flashing. The <SEL> key is pressed to select a digit to change. When the digit is selected the <EDT> key is pressed to change the digit from 0 through 9.

  • Page 18: Basic Operation

    Reference Manual Rev 1.0 Basic Operation In the most basic configuration, the instrument provides a simple weight readout. 5.1. Display and Controls Figure 14: Display and Controls Illustration 5.1.1. Front Panel: Visual Display The front panel has a six-digit LCD display. Figure 14 shows the main elements of the front panel.

  • Page 19: Operation Keys

    Reference Manual Rev 1.0 • Status Annunciators Status annunciators show the following: Symbol Name Description Visible when the gross reading is within ± ¼ of a division of ZERO true zero. Visible when the displayed reading represents NET weight. MOTION Visible when the displayed reading is not stable.

  • Page 20: Stability Considerations

    Reference Manual Rev 1.0 5.3. Stability Considerations Once a <ZERO>, <TARE> or <PRINT> key is pressed the instrument waits for a stable valid reading before performing the associated operation. If the weight readings remain unstable or invalid due to some diagnostic error for longer than 10 seconds, the operation is cancelled and the STABLE ERROR message is displayed.

  • Page 21: Tare Key

    Reference Manual Rev 1.0 5.6. TARE Key This key is used to temporarily set the scale to zero (such as cancelling the weight of a carton before performing a filling operation). The display will show the Net weight and the NET annunciator will be lit. The <TARE>...

  • Page 22: Print Key

    Reference Manual Rev 1.0 5.8. PRINT Key If a printer or computer has been attached to the instrument and the manual print function has been selected, the <PRINT> key will trigger an output of the current weight reading. The PRINT prompt is displayed while waiting for the printer to accept data.

  • Page 23: Configuration Issues

    Reference Manual Rev 1.0 Configuration Issues 6.1. General Setup Information Configuration and calibration can be performed entirely from the front panel, using the digital setup facility. When Full Setup is used, all menu items are accessible and care must be taken to ensure no accidental changes are made to calibration and trade settings.

  • Page 24: Filtering Techniques

    Reference Manual Rev 1.0 Calculating the total number of graduations: Signal voltages can be calculated as follows: Calculating the full scale signal (load cell): Since the instrument uses 5V load cell excitation, the absolute signal voltage is: Calculating the signal resolution: 6.3.

  • Page 25: Calibration Counter

    Reference Manual Rev 1.0 6.5. Calibration Counter Within Setup there are a number of critical steps that can affect the calibration and/or legal for trade performance of the instrument. If any of these steps are altered, the trade certification of the scale could be voided. The instrument provides built-in calibration counter(s) to monitor the number of times the critical steps are altered.

  • Page 26: Passcodes

    Reference Manual Rev 1.0 6.6. Passcodes The instrument has two levels of passcodes to provide a security lock on accessing Setup via the keypad. • Full Setup Passcode • Safe Setup Passcode The Full Setup passcode can also be used to access Safe Setup. 6.6.1.

  • Page 27: Setup

    Reference Manual Rev 1.0 Setup The instrument digital setup facilities provide the means to configure and calibrate the instrument. 7.1. Accessing Setup There are two methods to access the Setup area. For further details of menu items available in each setup mode, refer to the Setup Menu Quick Reference page 48. •...

  • Page 28: Setup Display Prompts

    Reference Manual Rev 1.0 7.1.1. Setup Display Prompts When accessing Full or Safe Setup the instrument will beep twice and then display the following: • FULL or SAFE (depending on setup access type) • SETUP • Software Version (eg. V1.0) •...

  • Page 29: Itm (Item)

    Reference Manual Rev 1.0 7.3.2. ITM (Item) Each group is divided into individual Items. Each item represents a parameter that can be changed. Pressing the <ITM> key will enter the displayed group, allowing access to the items within the group. The <ITM> key can be used to cycle through the available items.

  • Page 30: Option (Scale Options)

    Reference Manual Rev 1.0 • CABLE (4-Wire or 6-Wire) ⊗ Sets the load cell input to operate in 4-wire (auto sense) or 6-wire mode. • Options are: 4 or 6 • Default: 6 7.4.2. OPTION (Scale Options) Items within this Group are used to configure the operating parameters of the scale. •...

  • Page 31: Cal (Scale Calibration)

    Reference Manual Rev 1.0 • Z.RANGE (Allowable Zero Operating Range) ⊗ This setting restricts the range over which the Zero functions can operate. • Options are: -2_ 2, -1_ 3, -20_20 • Default: -2_ 2 (–2% to +2%) • Z.BAND (Zero 'Dead' Band) ⊗ This is an adjustable margin either side of true zero that defines the zero 'dead' band.

  • Page 32: Spec (Special Settings Menu)

    Reference Manual Rev 1.0 • DIR.SPN (Direct Span Calibration) ⊗ Select to enter the mV/V value of the full scale capacity of the scale build. This feature enables the instrument to be calibrated based on the rated output capacity of the load cells rather than using test weights. The accuracy of this method is limited to the accuracy of the published load cell ratings.
  • Page 33 Reference Manual Rev 1.0 • KEY.LOC (Front Panel Key Locking) This item allows individual keys to be locked and unlocked. The display shows a dash (–) to indicate that a key is locked (inactive) or characters for each key that is active (ie. the characters P12345 display). The letter P represents the <POWER>...

  • Page 34: Serial (Serial Communications Options)

    Reference Manual Rev 1.0 • REM.FN (Remote Function) This item allows the indicator to be triggered from a remote input. The remote input can be set to have no function (ie. NONE) or it can be set to mimic one of the front five panel key functions (ie.

  • Page 35: Set.pts (Setpoint Settings)

    Reference Manual Rev 1.0 • BITS (Serial Format Options) The Bits options allow the data transmission bit pattern and interface to be changed. The display will show the current setting in the form n81- where each character has a meaning as shown below. Options are: •...

  • Page 36: Clock (Clock Settings)

    Reference Manual Rev 1.0 • TARG.LO (Target for Underweight) This is the target for setpoint 2 (output 2). Weights below this target will cause the setpoint to become active and output 2 to be driven. The instrument displays the under annunciator. Refer to Status Annunciators page 17. •...

  • Page 37: Factry (Factory Adjustment Menu)

    Reference Manual Rev 1.0 • FRC.OUT (Force Outputs) Forces each of the output drivers in turn. All outputs turn OFF when leaving this step. The <EDT> key will advance through each output (ie. ON.1 and ON.2). Pressing <OK> will turn all outputs off and exit the test. 7.4.9.

  • Page 38: Calibration

    Reference Manual Rev 1.0 Calibration The calibration of the indicator is fully digital. The calibration results are stored in permanent memory for use each time the instrument is powered up. Note: Some of the digital setup steps can affect calibration. The BUILD and OPTION settings MUST be configured before calibration is attempted.

  • Page 39: Zero (Zero Calibration Routine)

    Reference Manual Rev 1.0 8.1.1. ZERO (Zero Calibration Routine) • Press the <SEL> key to start. The display will show the current weight. Remove all weight from the scale structure. • Press <SEL>, <EDT> or <OK> to execute a Zero Calibration. The display will show Z.in.P to indicate that zeroing is in progress.

  • Page 40: Dir.spn (Direct Span Calibration Entry)

    Reference Manual Rev 1.0 8.2.2. DIR.SPN (Direct Span Calibration Entry) • Press the <OK> key to start. The display will show the current weight. • Press the <OK> key to enter the Direct Span setting. Change the mV/V setting to the correct value for the full scale signal strength, using the <SEL> and <EDT>...

  • Page 41: Ed.lin (Edit Linearisation Points)

    Reference Manual Rev 1.0 8.3.1. ED.LIN (Edit Linearisation Points) • Press the <SEL> key to step through the list of points. Each point is shown as Ln.ppp where n is the point number (1 to 5), and ppp is the approximate percentage of full scale where the linearisation is applied.

  • Page 42: Serial Outputs

    Reference Manual Rev 1.0 Serial Outputs The instrument can support the optional temporary opto-LINK connection. In addition, there is a single bi-directional RS-232 output. This provides a number of serial output options allowing communications with external devices such as printers, computers, PLCs or remote displays.

  • Page 43: Master Serial Output

    Reference Manual Rev 1.0 • Printing The instrument has a single fixed printing format that is as follows: 000048 06/05/2003 15:10 121.4 kg G The first line contains a six digit sequential number that is automatically incremented with each printing, up to a maximum of 999999. The first line also contains the current date and time, printed in the selected format.

  • Page 44: Setpoints

    Reference Manual Rev 1.0 10. Setpoints The instrument is capable of working with two internal setpoints. The status of these setpoints is displayed on the LCD. Each setpoint is associated with a physical output driver but it may also be simply used as an indicator. Refer to SET.PTS (Setpoint Settings) page 33 for details on settings.

  • Page 45: Special Functions

    Reference Manual Rev 1.0 11. Special Functions 11.1. Introduction The instrument has a special function key on the front panel. This function of this key can be configured to any of the key functions detailed below. Refer to KEY.FN (Key Functions) page 31 to configure the function key.

  • Page 46: Hold And Peak Hold

    Reference Manual Rev 1.0 11.2.5. HOLD and PEAK HOLD The <HOLD> key implements a manual Hold function. The <PEAK> key implements a Peak Hold function where the largest absolute weight, either positive or negative is stored in the peak value (eg. -30 is larger than 25). The Hold annunciator is active when the display is showing the held weight.

  • Page 47: Show.t

    Reference Manual Rev 1.0 11.2.7. SHOW.T The SHOW.T item stands for Show Total. The function key will be labelled <TOTAL>. The PRINT key is used not only to print the current weight but also to add that weight to the current total. •...

  • Page 48: Appendix

    Reference Manual Rev 1.0 12. Appendix 12.1. Dimensions Weight Indicator Dimensions in mm (1 inch = 25.4 mm) 3D View Front View Side View Back View Weight Indicator (Desk Mount with Battery Compartment) Dimensions in mm (1 inch = 25.4 mm) 3D View Front View Side View...

  • Page 49: Sealing Details

    Reference Manual Rev 1.0 12.2. Sealing Details Affix sealing stickers to the rear of the instrument, over one or more screws in the locations indicated. Also affix a sealing sticker over the load cell cable where the cable-tie strain relief is attached, as indicated. Affix stickers in the locations indicated.

  • Page 50: Setup Menu Quick Reference

    Reference Manual Rev 1.0 12.3. Setup Menu Quick Reference Note: ⊗ Available only in Full Setup. Changing this setting will increment the Calibration Counter. 1 Available only in Full Setup. Changing this setting will not increment the Calibration Counter. ⊗ Group (GRP) Item (ITM) Page...

  • Page 51: Error Messages

    Reference Manual Rev 1.0 12.4. Error Messages A number of error messages may be displayed to warn of operation outside of the acceptable limits. These messages are described below. Short messages (XXXXX) will appear as a single message on the display. Longer messages (XXXXX) (YYYYY) will appear on the display in two parts, first the (XXXXX) part, then the (YYYYY) part.

  • Page 52: Setup And Calibration Errors

    Refer to Setup Lock-Out page 24 access setup. for more information. (LIN.PT) An attempt has been made to Incorrect linearisation point (LO) place a linearisation point below entered (must be between zero zero.

  • Page 53: Diagnostic Errors

    Reference Manual Rev 1.0 12.5. Diagnostic Errors The instrument continually monitors the condition of the internal circuits. Any faults or out-of-tolerance conditions are shown on the display as an E type error message. In the table below the following terms are used: •...

  • Page 54: Glossary Terms

    Reference Manual Rev 1.0 12.6. Glossary Terms Term Definition Count-by The smallest change in weight units that the display can show. See also Resolution. Division A single graduation. EEPROM Electrically Erasable Programmable Read-Only Memory Electro-Magnetic Compatibility Regulation Finite Impulse Response Full Scale The maximum gross weight allowed on the scale.

  • Page 55: Index

    Reference Manual Rev 1.0 13. Index Editing Annunciators, Sealing Requirements, 14, 17 4-Wire Connection, 8 L.in P, 29, 39 Electrical Safety, 6 LIVE.WT, 44 SERIAL, 32, 40 EMC Immunity, 6 Serial Communications, Load Cell Connection, 6-Wire Connection, 8 End – Leaving Setup, Serial Output, 40 Load Cell Signals, 7 ADDRES, 33...
  • Page 56 Reference Manual Rev 1.0 Notes: Page 54 003R-618-100...
  • Page 57 Notes:...

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