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Measurement Computing PML 1000 Operating Instructions Manual

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PML 1000 Operating Instructions
DESCRIPTION
This Set-up Guide describes how to install and configure your PML 1000.
This PML 1000 is marked with the international hazard symbol. It is important to read this Set-up Guide
before installing or commissioning your panel meter as it contains important information relating to
safety and Electromagnetic Compatibility EMC.
The PML 1000s provide the following features as standard:
• Scaleable Analog Output
• Dual Logic / Status inputs
• Optional RS485 Serial Communications interface with three protocols including MODBUS™ RTU
• 5 digit bright LED display
• Programmable function keys
• High Speed Analog output
INSTALLATION
To install your PML 1000 you will need to carry out the following steps:
• Install the PML 1000 into a panel.
• Make connections to the PML 1000.
Please note:
• Ensure that the power to PML 1000 is switched off before carrying out any installation or maintenance work.
• It is recommended that all connections to the terminals are made using ferrules to afford greater reliability and
to prevent short circuits between adjacent terminals.
• Avoid installing the PML 1000 close to switch gear, contactors or motor starters.
APP-01025, Rev A
PML 1000 Operating Instructions
www.meas-spec.com
1109
1/18

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Summary of Contents for Measurement Computing PML 1000

  • Page 1 Please note: • Ensure that the power to PML 1000 is switched off before carrying out any installation or maintenance work. • It is recommended that all connections to the terminals are made using ferrules to afford greater reliability and to prevent short circuits between adjacent terminals.
  • Page 2 2. Fit the rubber seal by slipping it over the unit from the rear of the box pushing it forwards until it sits behind the front lip of the unit. 3. Insert the PML 1000 into the panel from the front, pushing it through as far as the front lip, ensuring correct seating of the rubber seal between the panel and the unit.
  • Page 3 PML 1000 Operating Instructions Terminal Function Excitation + Yel./Red or Brn. (Pin F) Excitation – Yel./Blk. or Yel. (Pin E) Receive A Receive B Transmit A Transmit B Status (Logic) Input 2 Status (Logic) Input 1 Status Input Common (GND)
  • Page 4 POWERING THE PML 1000 The PML 1000 is designed to operate from an AC supply with voltages in the range 90 - 26SV AC SO/60Hz mains supply. The maximum power consumption is 20VA when all outputs are fully loaded and the display has all segments illuminated.
  • Page 5 CONNECTING THE STATUS INPUTS There are two status (logic) inputs on the PML 1000. These inputs can be used with voltage free contacts, such as relays or switches. Open collector transistor outputs can also be used. The inputs are active low i.e. activated by applying a short circuit between the status input and status common terminals.
  • Page 6 PML 1000 Operating Instructions MENU MODE KEY FUNCTIONS/ OPERATOR MODE KEY FUNCTIONS APP-01025, Rev A PML 1000 Operating Instructions www.meas-spec.com 1109 6/18...
  • Page 7 PML 1000 Operating Instructions APP-01025, Rev A PML 1000 Operating Instructions www.meas-spec.com 1109 7/18...

  • Page 8: Connecting The Transducer

    CONNECTING THE TRANSDUCER The transducer should be connected to the PML 1000 as illustrated in the diagram below. The PML 1000 is designed to operate with an LVDT in the Secondary to Primary Ratiometric Mode. Using this mode, the PML 1000 determines the measurement by taking into account both the primary and secondary voltages.

  • Page 9: Configuring The Display

    PML 1000 Operating Instructions CONFIGURING THE DISPLAY Decimal Point Position [dP] Allow the position of the decimal point on the display to be set. The decimal point may be positioned to give 0, 1,2,3 or 4 digits after the decimal point i.e. 3 decimal places would be 99.000. The default is 1 decimal place.
  • Page 10 Stroke [Stro] This allows the stroke of the LVDT to be entered as a value directly in mm This is used by the PML 1000 in conjunction with the LVDT sensitivity to determine the appropriate gain setting. This menu option is not accessible when Automatic Gain Selection is enabled.
  • Page 11 Scaling (SCLE) The PML 1000 is now calibrated to your LVDT. The default scaling is set to 100.0 units. To allow the unit to display the correct displacement for your LVDT the low and high display values need to be defined. To set the...

  • Page 12: Configuring The Analog Output

    PML 1000 Operating Instructions [oUEr] The PML 1000 has detected an error during calibration caused by the output of the LVDT being greater than the maximum positive input level of the PML 1000 at the specified sensitivity. [undr] The PML 1000 has detected an error during calibration caused by the output of the LVDT being lower than the minimum negative input level of the PML 1000 at the specified sensitivity.
  • Page 13 MODBUS™ ASCII and RTU. (J-BUS). PML 1000 Address [Addr] Defines the PML 1000 address when using the PML 1000 in a multi-drop system, the range of valid addresses is 1 - 247. The default is 1.
  • Page 14 CONFIGURING STATUS INPUTS The PML 1000 provides two status (logic) inputs, which can be assigned to perform one or more functions when activated. With the exception of the Calibration function, which is started when there is a transition from inactive to active state on the input, all other functions will be active only while the status input is active.

  • Page 15: Configuring Function Keys

    The default value is 0 (No Password). Default [dFLt] This allows the unit to reset back to its factory default settings. Select ON to default the PML 1000. This parameter will automatically revert to OFF when the PML 1000 is defaulted. Time-out [tout] This defines the time in seconds that the unit will remain in configuration mode when there is no key activity.

  • Page 16: Product Specification

    [brA] The PML 1000 has detected a problem with the sensor resulting in an open circuit input, this may be caused by a break in one of the leads from the transducer or a fault in one of the transducer elements.

  • Page 17: Appendix A Calibration

    It is important that the LVDT operates around the midpoint of its stroke as this gives the best results by minimizing any errors due to non-linearity. A feature of this PML 1000 is the ability to locate the midpoint of the LVDTs measurement range (Null point).

  • Page 18: Ordering Information

    In order to display the displacement or other parameter in the correct units of measurement it is necessary to first scale the PML 1000. To do this, select SCLE from the main configuration menu and enter the desired Low and High display values. The low display value corresponds to the displacement at the Low input (calibration) point i.e.

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