Milltronics MD-256 Instruction Manual
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Milltronics MD-256 Instruction Manual

Milltronics MD-256 Instruction Manual

Speed sensor
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MD-256 Speed Sensor
Instruction Manual
PL-543
April 1998
33455430
Rev
1.0

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Summary of Contents for Milltronics MD-256

  • Page 1 MD-256 Speed Sensor Instruction Manual PL-543 April 1998 33455430...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Specifications General Operation Circuit Installation Dimensions Mounting Mounting to a Tail Pulley Mounting to a Bend or Snub Pulley General Installation Steps Interconnection (Wiring) Terminals Terminal Connections to Integrators Maintenance Inspection Bearing Replacement PL-543...

  • Page 4: Specifications

    SPECIFICATIONS Power » +10 to +15V dc, 30mA (from integrator) Ambient » -40° to 55° C (-40°F to 131°F) Temperature Input » Shaft rotation 0.5 to 470 rpm, bidirectional Output » Unidirectional open collector sinking output » +5V dc, 25mA max (to integrator) »...

  • Page 5: General Operation

    GENERAL OPERATION The MD-256 is a digitizing speed sensor for use on belt scales. It connects to the shaft of a pulley and measures the shaft's rotation by sending pulses to the Milltronics integrator. This speed sensor features: » High resolution for accurate measurement »...

  • Page 6: Installation

    INSTALLATION Installation must only be performed by qualified personnel. DIMENSIONS 305mm (12.0”) 50mm 131mm (1.96”) (5.16”) 89mm (3.5”) Rod ∅: 8.0mm (5/16” ) 60mm (2.38”) Shaft ∅: 15.9mm (5/8") 102mm (4.03”) 1/2" NPT conduit entrance (optional PG13.5 adapter available) 159mm 102mm 6.25”...

  • Page 7: Mounting

    MOUNTING The input shaft on the MD-256 is coupled to the rotating shaft on a belt driven pulley and is not externally supported. The unit’s arresting rod stops it from rotating with the shaft and can be fitted with a spring to soften sudden speed changes.

  • Page 8: Mounting To A Tail Pulley

    MOUNTING TO A TAIL PULLEY Tension spring (supplied) Angle bracket slotted Belt for arrestor rod ≥10mm (.375”) MD-256 Flexible conduit Angle bracket slotted Tension spring for arrestor rod Arrestor rod (cut to suit) 89mm 3.5” MD-256 Flexible conduit Notes: Distance “d” is the take up travel on the tail pulley When adjusting the belt take up ensure that there is play on the arrestor rod.

  • Page 9: Mounting To A Bend Or Snub Pulley

    MOUNTING TO A BEND OR SNUB PULLEY Tension spring (supplied) Stringer MD-256 Belt Flexible conduit Tension spring Stringer 3/8” drilled hole for Arrestor rod (cut to suit) arrestor rod Bend or Snub pulley 90mm 3.5” MD-256 Flexible conduit Pulley bearing Notes: When mounting to a bend or snub pulley only a 3/8”...

  • Page 10: General Installation Steps

    Attach angle iron bracket to work with the arrestor rod (if mounting on a tail pulley) Cut the arrestor rod to a suitable length Insert the MD-256 shaft into the pulley shaft and lock with set screw on flat of shaft Attach spring to arresting rod and frame 127mm (5”)

  • Page 11: Interconnection (Wiring)

    INTERCONNECTION (WIRING) All wiring must be done in conjunction with approved conduit, boxes and fittings and to procedures in accordance with all governing regulations. Interconnection between the unit and the integrator should be made with 3-wire shielded, 18 AWG cable. Ground the shield at the integrator end ONLY. Flexible conduit is recommended so that excess stress is not applied to the shaft bearings.

  • Page 12: Terminal Connections To Integrators

    Compu-M Compu III Accumass BW-100 Determine the pulley shaft rotation on the end of the pulley shaft to which the MD-256 is attached. If the pulley shaft is rotating clockwise then connect the appropriate wire to terminal 2. If the pulley shaft is rotating counter clockwise then connect the appropriate wire to terminal 3.

  • Page 13: Maintenance

    Printed circuit board Shaft Mounting screws The bearing will wear prematurely if there is any force applied to the MD-256 body. Ensure that only flexible conduit is used on the unit and that it is not exerting force on the unit. PL-543...
  • Page 14 Replace the mounting screws for the circuit board 10. Reconnect to the installation 11. Rewire the terminal block 12. Replace the MD-256 cover Replacement Parts Part numbers and suppliers for the user-serviceable parts in the MD-256 are: Part Supplier Part Number Bearings (parts D)

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