VPG BHL Nobel AST 3 Technical Manual
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VPG BHL Nobel AST 3 Technical Manual

Analogue signal transmitter
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Summary of Contents for VPG BHL Nobel AST 3

  • Page 2: Table Of Contents

    Analogue Signal Transmitter AST 3 Contents 5. Operation 1. Introduction General ....Versions ....1-1 Power supply ... Functions ....1-2 Power-up sequence ..Technical data ..1-4 Display views in Oper. mode 2. Installation Zero setting ... General ....2-1 Analogue output ..
  • Page 3 Technical Manual...

  • Page 4: Introduction

    Analogue Signal Transmitter AST 3 1. Introduction AST 3 is a high performance signal transmitter, designed for industrial measuring by means of strain gauge transducers. The compact module is easily installed on a DIN-rail or a flat surface. By serial communication a number of AST 3 modules can be combined to form a network with a common control unit.

  • Page 5: Functions

    Technical Manual Functions Measuring with strain gauge transducers. The output signal and the sense (representing the excitation voltage) are measured at the transducer by four wires to avoid influence from voltage drop in the connection cable. Excitation to the transducer, from AST 3 or from an external DC-power supply, is provided over separate wires.
  • Page 6 Analogue Signal Transmitter AST 3 will be off, the relays will be deactivated, and the analogue output signal will be set to 0V / 0mA.
  • Page 7 Technical Manual Levels. Two level comparators in AST 3 can be set to switch at defined levels for selected signals, reporting the status of the signals to the control unit. In AST 3P two switching relays are included. They can be set to indicate the status of the level comparators or the status of the signal ‘In process’.
  • Page 8 Analogue Signal Transmitter AST 3 Presentation. AST 3 can present parameter values and measured or calculated signal values at a control unit, and for AST 3P at the panel display. The measurement value is also presented by the analogue output signal.

  • Page 9: Technical Data

    Technical Manual Technical data Transducer input Transducers Max 8, 350 ohms each. Total load >45 ohms. Excitation Depending on the number of transducers connected: 8.8 VDC 5 % with 1 transd. 8.7 VDC 5 % with 2 transd. 8.5 VDC 5 % with 3 transd. 7.7 VDC 5 % with 4 transd.
  • Page 10 Analogue Signal Transmitter AST 3 Filter 0.05 to 75 Hz, selectable bandwidth. Non-linearity <0.005 % of range. Zero drift <0.0002 % of 3.3 mV/V /C. Gain drift <0.0015 % of actual value/°C.
  • Page 11 Technical Manual Calibration Methods Data sheet, Dead weight or Table. Power supply Supply voltage 24 VDC ±20 %. Consumption 7 W. Environmental Temperature range –10 to +50 °C. CE conformity EMC, industrial for process control. Mechanical data Dimensions 75 x 100 x 110 mm. At least 10 mm air gap between units.
  • Page 12 Analogue Signal Transmitter AST 3 Figure 5. The Analogue Signal Transmitter AST 3P.

  • Page 14: Installation

    Analogue Signal Transmitter AST 3 2. Installation General Each signal transmitter module AST 3 contains several circuit boards, built into a protective plastic housing. The module can be snap- mounted on a 35 mm wide DIN rail or attached on a flat surface by two 4 mm screws.
  • Page 15 Technical Manual Serial communication Terminals 19 – 23. A serial port for RS-485, on 2-wire or 4-wire with common signal ground (COM), is used to connect AST 3 to a control unit, or to transmit values to an external display unit. At both ends, the transmission line must have terminating resistors of 120 ohms.
  • Page 16 Analogue Signal Transmitter AST 3 Transducer input Terminals 1 – 7 (8). Connection of transducers should be handled with great care to achieve good measuring data. For transducers delivered with integrated connection cable, this cable must not be shortened. NOTE! Transducer cables must be routed at least 200 mm away from 230/380 V, 50/60 Hz power cables.
  • Page 17 Technical Manual the transducer must be lengthened, or if several transducers should be connected to one AST 3 unit. Connect the transducer cable(s) to a junction box, and use 6- wire connection between the junction box and AST 3. Connect the cable shield and terminal 5 to ground via the mounting rail.

  • Page 18: Presentation Panel, Ast 3P

    Analogue Signal Transmitter AST 3 Presentation panel, AST 3P The presentation panel of AST 3P has a 2x16 character LCD display and four keys. In Operating mode the weight value is presented in one view, but other views may also be selected. Set-up can be performed in two ways: the ‘Quick set-up’...
  • Page 19 Technical Manual cursor: Decrement the digit at the cursor or Go to previous alternative. ESCAPE If pressed for 2 seconds: In a ‘Main menu’: Go to ‘Quick set-up’. No function. (Password may be required.) If held while + is Parameter viewing, without cursor: pressed for 2 seconds: Go to the main menu.
  • Page 20 Analogue Signal Transmitter AST 3 Example for how to use the keys: As an AST 3P is started for the first time it enters the Operating mode, displaying the Weight value. This example describes how to change ‘Measurement unit’ to pounds (lb) and Capacity to 1000 (lb), using the ‘Quick set-up’.

  • Page 21: Operation Indicator, Ast 3B

    Technical Manual In both cases the set-up is finished and the module switches to Operating mode, displaying the Weight value. Operation indicator, AST 3B Instrument operation is always indicated by a green LED inside the module, and for AST 3B the LED is visible through a hole in the upper right corner of the front panel.
  • Page 22 Analogue Signal Transmitter AST 3...

  • Page 24: Set-Up

    Analogue Signal Transmitter AST 3 3. Set-up General All operating functions in AST 3 are controlled by permanently stored parameters, so the information will not be lost if the module is switched off. At delivery the parameters are factory- set to default values, giving the module an initial standard function.
  • Page 25 Technical Manual sequences contain all set-up parameters, divided in groups under a number of main menus. The ‘Normal set-up’ is started by activation of two keys simultaneously, see figure 8.
  • Page 26 Analogue Signal Transmitter AST 3 Operating mode Start up/Reset 54.5 kg 001 W eight value R1:On R2:On for 2 seconds Enter password: Shown only if (Wrong)(Correct) 'Security lock' is On. Quick set-up Set-up mode, Main menu Main menu Quick set-up Exit set-up Shown only if Language...

  • Page 27: Quick Set-Up

    Technical Manual Quick set-up In ‘Quick set-up’ for AST 3P a few basic parameters can be edited. A separate publication, ”AST 3 Operating instructions, Quick installation”, gives a step-by step instruction for the set-up operation. A brief instruction is given below. Parameter explanations are found on pages 3-4, 3-5 or in the complete parameter list on pages 3-10 to 3-22.
  • Page 28 Analogue Signal Transmitter AST 3 sheet calibration and dead weight calibration. See section Calibration for more information about calibration types and parameters. Exit ‘Quick set-up’ See figure 7. First press to get to ‘Main menu Exit set-up’, and then press If nothing was edited, ‘Quick set-up’...
  • Page 29 Technical Manual Parameters in ‘Quick set-up’ ‘Quick set-up’ for AST 3 includes parameters for setting of basic instrument properties and for calibration of the measuring equipment. For each parameter a short explanation and the range for the parameter value is given. The parameters are also explained on pages 3-10 to 3-22.
  • Page 30 Analogue Signal Transmitter AST 3 Known weights are used as load on the equipment. See section Calibration for further information on calibration types. List of alternatives: Data sheet, Deadweight, Table. Default value: Data sheet.
  • Page 31 Technical Manual ’Conv. factor’ This parameter defines the conversion factor by which a value expressed in ‘measure-ment unit’, must be multiplied to be expressed in the transducer data sheet unit. Consequently the factor is 1 if measurement unit and data sheet unit are equal. Default value can be used if ‘measurement unit’...
  • Page 32 Analogue Signal Transmitter AST 3 ‘Set zero’ Used in both calibration types for zeroing of the instrument. The actual weight is displayed. Press , the weight value is set to zero. Press for 2 sec., the zeroing is accepted. ‘Zero offset’ Displayed after zeroing for both calibration types.
  • Page 33 Technical Manual Operating mode Weight value Zero setting Level settings Input signal Serial no., Progr. Analogue output signal 0.18200mV/V 001 54.5 kg 001 54.5 kg 001 54.5 kg 001 S/N: 97-1001 Progr. A001A120 R1:On R2:On Zero 5.430 V R1:On R2:On 2 sec.

  • Page 34: Normal Set-Up

    Analogue Signal Transmitter AST 3 Normal set-up At delivery, the AST 3 parameters have default values. During the set-up operation the parameters are set to appropriate values for the actual installation. These values are saved in the AST 3 memory, and should also be recorded manually, for example in a set-up list like the one in Appendix 2.
  • Page 35 Technical Manual presented later in this section. As shown in the figures, the keys are used to step backwards and forwards in the sequence of main menus. As a main menu is displayed, press to get access to the parameters. 3-12...
  • Page 36 Analogue Signal Transmitter AST 3 Main menus ‘Level superv.’ AST 3 has two identical channels for level supervision, called Level 1 and Level 2. Parameters under ‘Level superv.’ are used to activate these channels and to select supervision of the transducer input signal or of the internal weight value.
  • Page 37 Technical Manual and indication of the zero offset value. ‘Diagnostics’ Parameters are available to test the digital inputs, the internal relays, and the analogue output. ‘Exit set-up’ A sub menu gives the opportunity to save, or to cancel, all edited values before leaving the ‘Normal set-up’. 3-14...
  • Page 38 Analogue Signal Transmitter AST 3 Editing procedure, AST 3P To perform editing of a parameter in ’Normal set-up’, first go to the main menu that contains the parameter and press ENTER (the key). Then use key to step forwards or backwards in the sequence to find the wanted parameter.

  • Page 39: Parameters

    Technical Manual displaying the weight value. Parameters On the following pages all set-up parameters, in groups by the main menus they belong to, are presented in the order they appear in the set-up sequences. The first line indicates the parameter name and the Modbus addresses, used for set-up by serial communication.
  • Page 40 Analogue Signal Transmitter AST 3 [index] Range/Alternative Explanation and <default value> result of alternatives. ‘Main menu Level superv.’ Level 1 source Modbus: 41000 (46000) Not in use Turns Level 1 off or defines supervision of Input sign. transducer input signal or internal weight mV/V value.
  • Page 41 Technical Manual [index] Range/Alternative Explanation and <default value> result of alternatives. Level 2 source Modbus: 41008 (46008) Main menu Level superv. Not in use Turns Level 2 off or Input sign. defines super-vision of mV/V transducer input signal Level 1 source Weight or internal weight value.
  • Page 42 Analogue Signal Transmitter AST 3 ‘Level 2 value’. Below level: Relay 2 is active as the supervised signal level is below ‘Level 2 value’. 3-19...
  • Page 43 Technical Manual 3-20...
  • Page 44 Analogue Signal Transmitter AST 3 [index] Range/Alternative Explanation and <default value> result of alternatives. ‘Main menu General’ Language Modbus: 41016 (46016) Svenska Defines the language to be English used Deutsch in parameters and messages. Français <English> Start mode Modbus: 41018 (46018) Command Defines the start mode Auto...
  • Page 45 Technical Manual Range: Defines the valid password for the 0001 – 9999 security lock. <1937> The code is represented by four asterisks, until editing is started. 3-22...
  • Page 46 Analogue Signal Transmitter AST 3 [index] Range/Alternative Explanation and <default value> result of alternatives. ‘Main menu Analogue output’ Ana. output type Modbus: 41030 (46030) +/-20mA Defines the type of signal, used to -12–20mA represent 0–20mA the weight value at the analogue output. 4–20mA +/-20mA, -12–20mA: bipolar current output, +/-10V...
  • Page 47 Technical Manual [index] Range/Alternative Explanation and <default value> result of alternatives. Fixed ana. outp. Modbus: 41036 (46036) Range: Defines the fixed signal +/-22.00 or value +/-11.00 at the analogue output. Unit: mA or The range and unit depends on the alternative for ‘Ana. <0>...
  • Page 48 Analogue Signal Transmitter AST 3 be adjusted to give wanted reading at the analogue instrument. The adjustment range corresponds to about ±2 % of maximum analogue output. The parameter value will be set to zero each time ‘Ana. output type’ is changed. 3-25...
  • Page 49 Technical Manual [index] Range/Alternative Explanation and <default value> result of alternatives. ‘Main menu Communication’ Serialport mode Modbus: 41044 (46044) Not in use Defines the serial port use. Modbus Not in use: The serial port is Modbus auto not used. External Modbus: Communication with a display control unit.
  • Page 50 Analogue Signal Transmitter AST 3 <6 > Serialport mode. 3-27...
  • Page 51 Technical Manual [index] Range/Alternative Explanation and <default value> result of alternatives. ‘Main menu Calibration’ Measurement unit Modbus: 41054 (46054) NONE Defines the engineering unit that should be used for the measurement value and related set-up parameters. [10] [11] [12] [13] [14] [15] [16]...
  • Page 52 Analogue Signal Transmitter AST 3 [index] Range/Alternative Explanation and <default value> result of alternatives. Mains frequency Modbus: 41060 (46060) 50 Hz Defines a filter for suppression of mains 60 Hz frequency noise. <50 Hz> 50 Hz: 50 Hz filter activated. 60 Hz: 60 Hz filter activated.
  • Page 53 Technical Manual [index] Range/Alternative Explanation and <default value> result of alternatives. ‘Data sheet’ Conv. factor Modbus: 41066 (46066) Range: Defines the relationship between a 0.01 to 99 measurement value expressed in data sheet <9.80665> unit and expressed in the selected measurement unit.
  • Page 54 Analogue Signal Transmitter AST 3 Range: Defines the rated load for one transducer, 1 to 999999 expressed in Unit: the unit of the transducer data sheet. Data sheet NOTE! If, for example, the data sheet value unit is 5 kN, <2000.0>...
  • Page 55 Technical Manual [index] Range/Alternative Explanation and <default value> result of alternatives. ‘Deadweight’ Value cal. p.1 Modbus: 41080 (46080) Range: The scale is calibrated at two points, +/-999999 normally unloaded Unit: and loaded to at least 2/3 of the wanted Measurem. range.
  • Page 56 Analogue Signal Transmitter AST 3 3-33...
  • Page 57 Technical Manual [index] Range/Alternative Explanation and <default value> result of alternatives. ‘Table’ Value cal. p.1 Modbus: 41080 (46080) Range: Calibration with To 'Main menu +/-999999 recorded values from a Calibration' Unit: previous dead weight Measurem. calibration. V a l u e c a l . p . 1 unit This parameter should 0 .
  • Page 58 Analogue Signal Transmitter AST 3 [index] Range/Alternative Explanation and <default value> result of alternatives. ‘Main menu Diagnostics’ Status input 1 Modbus: 41360 (46360) Displays the status of digital input 1. No changes can be made. Status input 2 Modbus: 41362 (46362) Displays the status of digital input 2.
  • Page 59 Technical Manual ‘Main menu Exit set-up’ Save changes? Range: To exit from Set-up mode, press in ‘Main menu Exit set-up’. If any parameter values have been changed ‘Save changes? Esc. Yes’ is displayed. (Press if you do not wish to exit from the set-up mode.) Press (Yes) to exit from Set-...

  • Page 60: Calibration

    Analogue Signal Transmitter AST 3 4. Calibration General When measuring with AST 3, the transducer output signal, corresponding to the transducer load, is converted to a weight value and presented at the analogue output, and at the AST 3P panel or at a connected control unit.
  • Page 61 Technical Manual In weighing applications it is essential for correct results that fixed mechanical connections to the scale are avoided. Necessary connections must be flexible and perpendicular to the measuring direction. If the scale has several transducers connected in parallel, they must have the same rated load and impedance.

  • Page 62: Common Calibration Param

    Analogue Signal Transmitter AST 3 Common calibration parameters For all the calibration types, measurement unit and resolution for the weight value and some other characteristics must be specified. The sequence of these parameters, common for all calibration types is given on pages 3-17 and 3-18.
  • Page 63 Technical Manual 2. Find the wanted calibration type, using the key until the correct alternative is displayed. 3. Accept the displayed calibration type by pressing for 2 seconds. The cursor disappears and the selected calibration type will be displayed.

  • Page 64: Data Sheet Calibration

    Analogue Signal Transmitter AST 3 Data sheet calibration Data sheet calibration is the default value for ‘Calibration type’ because it is recommended as first-time calibration for AST 3. An accuracy of 0.1 % can be obtained without use of known loads etc. By data sheet calibration in weighing applications it is essential that no external forces influence the scale installation.
  • Page 65 Technical Manual Set zero After the data sheet values have been entered as parameter values, the instrument will perform necessary calculations, and a weight value corresponding to the actual load on the transducer will be displayed here. The parameter value is set to zero as (enter) is pressed.

  • Page 66: Dead Weight Calibration

    Analogue Signal Transmitter AST 3 Dead weight calibration This is normally the most accurate calibration type. The transducer signal is measured and stored together with the entered value of the known load (expressed in the selected measurement unit) for two calibration points. It is essential for good accuracy to utilise calibration points at both ends of the measuring range, for example at zero load and at least...
  • Page 67 Technical Manual Set zero See Data sheet calibration on page 4-3. Zero offset See Data sheet calibration on page 4-3.

  • Page 68: Operation

    Analogue Signal Transmitter AST 3 5. Operation General There are two versions of AST 3 with identical measuring and set-up functions. For both versions, the function control and parameter set-up can be performed by serial communication from a control unit. This section mainly describes operation and function control for the instrument version AST 3P.
  • Page 69 Technical Manual Figure 11. The display of AST 3P during the power-up sequence.
  • Page 70 Analogue Signal Transmitter AST 3 Display views in Operating mode Figure 12. For AST 3P in Operating mode, at least one of the display views, Weight value, is always available. More views can be set On or Off in parameters under ‘Main menu General’.
  • Page 71 Technical Manual Analogue output signal This view can be set On or Off by parameter ‘More views’. The upper line displays the actual weight value, followed by the area with information about the serial communication. The lower line displays the signal at the analogue output, a value in V or mA depending on the choice for parameter ‘Ana.

  • Page 72: Zero Setting

    Analogue Signal Transmitter AST 3 Level settings This display can be set On or Off by parameter ‘More views’. At the upper line the switching level for ‘Level 1’ is displayed. At the lower line the switching level for ‘Level 2’ is displayed.
  • Page 73 Technical Manual bandwidth can be set to reduce oscillation in the output signal, or to enable registration of fast changes by the analogue output. If an error occurs, the analogue output signal will be set to 0 V / 0 mA. One way to select the range of measurement value, presented at the analogue output, is by parameter ‘Capacity’...

  • Page 74: Level Supervision, Relays

    Analogue Signal Transmitter AST 3 Level supervision, relays Level supervision is used to indicate whether a selected signal is above or below a certain level. In AST 3 two level supervision channels are included. For each channel, supervised signal, switch level, and hysteresis region are set individually by parameters under ‘Main menu Level superv.’.
  • Page 75 Technical Manual Relay 1 source, Relay 2 source Two relays in AST 3P can be controlled either by the level supervision channels or by the ‘In process’ signal. In process The relay is active as AST 3P is in Operating mode. Above level The relay is active as the value of the selected signal source...

  • Page 76: Communication

    Analogue Signal Transmitter AST 3 6. Communication The analogue signal transmitter AST 3 has one serial communications port, primarily used for communication with a control unit. Alternatively it can be used for data transmission to an external instrument. Communication interface The serial communication utilises RS-485 for 2-wire or 4- wire.
  • Page 77 Technical Manual same time. This can distort the reply message and make it impossible to decode.

  • Page 78: Modbus

    Analogue Signal Transmitter AST 3 Modbus General For communication between AST 3 and a master computer (PLC) the Modbus protocol is used. The Modbus protocol is a standard protocol, used for master/slave communication in the industry. With AST 3 the Modbus RTU protocol is used. Information is transmitted in blocks of data to minimise polling and response time delays.
  • Page 79 Technical Manual Supported Modbus functions Function Description Reads the ON/OFF state of discrete outputs (0X references, coils). This function is only implemented because some Read Coil Status 'masters' use this function to initialise communication (check that communication is working OK). Coil range: 1 –...
  • Page 80 Analogue Signal Transmitter AST 3 which is a 'loop-back' test. The same data as Diagnostics received will be sent back to the master. Max number of data bytes: 64...
  • Page 81 Technical Manual Function Description Forces each coil (0X references) in a sequence of coils to either ON or OFF. Force Multiple This function is used to activate an action in Coils the AST 3 (see description of I/O bits below). Each coil or I/O bit is linked to an action in the AST 3.
  • Page 82 Analogue Signal Transmitter AST 3 Unsigned integer (1 modbus register) Error codes, status etc. are saved in one modbus register as an unsigned integer (16 bit number without decimals). Scaled integer (2 modbus registers + 1 modbus register = 3 modbus registers) Values bigger than 32767 and values containing decimals (Weight, levels) are...
  • Page 83 Technical Manual Example: 12345678 (32 bit number) in the two first registers and 3 in the third register give the value: 12345.678. Regis Binary Hexa- Decimal Description decimal 0000 0000 00BC The 16 most significant 1011 1100 bits in the value. 0110 0001 614E 24910...
  • Page 84 Analogue Signal Transmitter AST 3 The parameters are stored in two different float formats. Some devices may transfer the values with the high order bits in the first register and the low order bits in the second register. Other devices may invert the register order. Modicon float: For true Modicon PLC’s, use these register areas.
  • Page 85 Technical Manual Register description - Process parameters AST 3 simulates a number of Modicon 'Holding Registers' (registers 4XXXX ... ). These are 16 bits binary registers and holds the data that can be transferred between the master and the AST 3. Some of these registers can only be read from the master, while others can both be read from and written The Modbus function 03 'Read Holding Registers' should be used to read these register and the Modbus function 05...
  • Page 86 Analogue Signal Transmitter AST 3 reg) value 40027 40230 45230 Input signal reg) (mV/V) 40030 40232 45232 Command register R/W * reg) 40031 40234 45234 Level 1 value reg) 40034 40236 45236 Level 2 value reg) 40037 40238 45238 Analogue fixed reg) value Important: The weight register should never be read alone because...
  • Page 87 Technical Manual Instrument type register This is a READ ONLY register. This register holds the type of the instrument. For AST 3 this value is 2001. Program number This is a READ ONLY register. This register holds the program number of the AST 3. Normal programs have a value below 100 and special programs a value above 100.
  • Page 88 Analogue Signal Transmitter AST 3 Instrument state register This is a READ ONLY register. This register contains the state of the AST 3 unit. Code Description ‘Starting up’ state. The instrument is starting up after a reset or power on. ‘Wait for start’...
  • Page 89 Technical Manual Status register 1 This is a READ ONLY register. The register status bits have the following meaning (bit = 1 means true while bit = 0 means false). (Bit 0 is the least significant bit in the register). The bits not mentioned in the table are always zero.
  • Page 90 Analogue Signal Transmitter AST 3 Above Level 1 The weight (or mV/V value) is above level 1. Above Level 2 The weight (or mV/V value) is above level 2. Analogue output Bit set indicates voltage. voltage/current Note: When this register is read in the float area a float value representing the bits set, is returned.
  • Page 91 Technical Manual Weight This is a READ ONLY register. This register holds the weight. The weight should not be read alone because the status and error codes are stored in other registers. The weight is only valid when the register ‘Instrument error’...
  • Page 92 Analogue Signal Transmitter AST 3 The registers are used to set temporary levels for the relays. At start up these level values are fetched from corresponding set-up parameters (saved in the memory), which means that the values written to these registers are only valid up to reset or power fail.

  • Page 93: I/O Bit (Coil) Description

    Technical Manual Analogue fixed value This is a READ/WRITE register. The register could be used to set new temporary values on the analogue output, when the analogue output is configured as ‘Fixed+/-20mA’ or ‘Fixed+/-10V’ in the set-up. At start up the value is fetched from corresponding set-up parameter (saved in the memory), which means that a value written to this register is only valid up to reset or power fail.
  • Page 94 Analogue Signal Transmitter AST 3 104 Do Reset This command is used to reset the instrument from remote location. 105 Check set-up data This command checks that the set-up is correct. 6-19...

  • Page 95: Exception Responses

    Technical Manual Exception responses When the master sends a query to a slave it expects a normal response (as described earlier). One of the following three events occur after a query from the master. 1. Normal response. The slave has received the query without communication error and can handle the query normally.

  • Page 96: Set-Up Registers

    Analogue Signal Transmitter AST 3 Set-up registers Set-up registers data area All set-up parameters are saved in float format and can be read and manipulated by a remote master. Two different types of float formats are supported, which one you should use depends on your Modbus master.
  • Page 97 Technical Manual  Start by setting coil 100 ‘Enter Remote Set-up’.  Locate the resolution parameter in chapter 3. This gives modbus register 41056.  Set resolution ‘0.2’ by sending ‘7’ to modbus register ‘41056’.  Proceed with changes of all the parameters that are to be changed.

  • Page 98: External Display

    Analogue Signal Transmitter AST 3 External display If the choice ‘External display’ is selected for parameter ‘Serialport mode’, the serial port on the AST 3 can be used for presentation of the weight on an external display unit. The transmitted weight is adapted for Newport/London large digit indicators with 4, 5, 6 or 7 digits and the Intrinsic safety indicator BA488C with 32 characters, connected through the serial communication isolator MTL5051.
  • Page 99 Technical Manual minus sign). Last End character (CR). 6-24...
  • Page 100 Analogue Signal Transmitter AST 3 Definition of weight value to large digit indicator 6 digits: Character Value Value Function alphanumeric Start character (STX). H, blank 48, 20 This character is present only if 6 digits is selected in 'Ext. disp,format’. H = Left led ON, blank = led’s OFF.
  • Page 101 Technical Manual 6-26...

  • Page 102: Troubleshooting

    Analogue Signal Transmitter AST 3 7. Troubleshooting General AST 3 has an automatic error checking facility. This serves to facilitate trouble-shooting and to ensure that the instrument will function in the best possible manner. The error checking provides guidance on how to deal with the fault or error. When an error occurs the signal ‘In process’...
  • Page 103 Technical Manual Weight errors The indication is either temporary or stays on until the cause is cured. At AST 3P the text within ” ” is scrolled while the error code is displayed. Error Explanation code No error. The instrument is in Operating mode and no error is detected.
  • Page 104 Analogue Signal Transmitter AST 3 TransducerSignal out of range. The input signal is too low. (A fault in accordance with Error 012 above is also possible.)
  • Page 105 Technical Manual Start-up errors These error codes can only appear during start-up. Error Explanation code Invalid set-up version. This error usually occurs at first start-up after a program upgrade. The actual settings have been replaced by default values. Enter set-up mode, perform the necessary editing and save the new parameter settings.
  • Page 106 Analogue Signal Transmitter AST 3 General errors These errors generally occur due to faulty entries from the front panel, alternatively invalid data or unallowed commands from the control unit. Error Explanation code Instrument in wrong state. The transmitted command is not applicable to the present AST 3 mode.
  • Page 107 Technical Manual Set-up errors These errors occur only during instrument set-up, from the front panel or by serial communication. Certain errors depends on more than one set-up parameter and it is the operator's responsibility to locate and correct all faulty set-up parameters.
  • Page 108 Analogue Signal Transmitter AST 3 Illegal calibration direction. Increasing transducer signal must correspond to increasing weight value. Illegal analogue range high/low. Parameter value ‘Ana. range high’ / ‘Ana. range low’ out of allowed range. 41000 - Exit Remote Set-up/Restore not allowed. There is an error in the parameter 41900 pointed out by this error code.
  • Page 109 Technical Manual Temporary communication for AST 3B Electrical installation is similar for AST 3P and AST 3B, and both versions have the same sequence of set-up parameters. But the AST 3B has no function keys at the front panel, so set-up must be performed from a control unit by serial communication.
  • Page 110 Analogue Signal Transmitter AST 3 Connect yourself to ground. Put the jumper back in place in the module. Put the front panel back on AST 3B. Connect the 24 VDC power to the module. AST 3B will perform power-up and the saved parameter values will be active.
  • Page 112 Analogue Signal Transmitter AST 3 Set-up list for AST 3 .... Address: ..Location/Notes: ..........Progr. name: ... Ser. no.: ..Date: ..Modbus Parameter Default Set-up number name value value 41000 Level 1 source Not in use [0] .....
  • Page 113 Technical Manual Set-up list for AST 3 .... Address: ..Location/Notes: ..........Progr. name: .... Ser. no.: ..Date: ..Modbus Parameter Default Set-up number name value value 41066 Conv. factor 9.80665 ...... 41068 Number of transd 3 ......
  • Page 114 Analogue Signal Transmitter AST 3 Appendix 2. Declaration of Conformity...
  • Page 115 Document no. 35156 Article no. 600 232 R11 © Vishay Nobel AB, 2011-05-11 Subject to changes without notice. www.blhnobel.com...

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