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Summary of Contents for Milltronics MD-256
- Page 1 MD-256 SPEED SENSOR September 2001 Instruction Manual PL-543...
- Page 2 Contact SMPI Technical Publications at the following address: Technical Publications Siemens Milltronics Process Instruments Inc. 1954 Technology Drive, P.O. Box 4225 Peterborough, Ontario, Canada, K9J 7B1 Email: techpubs@milltronics.com For the library of SMPI instruction manuals, visit our Web site: www.milltronics.com © Siemens Milltronics Process Instruments Inc. 2001...
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Page 3: Table Of Contents
Mounting..................5 Mounting to a Tail Pulley ..............6 Mounting to a Bend or Snub Pulley ..........7 General Installation Steps..............8 Interconnection (Wiring) ..............9 Terminals..................9 Terminal Connections to Milltronics Integrators ......10 Maintenance ..................11 Inspection ..................11 Bearing Replacement ..............11 Bearing Replacement Procedure ..........12 7ML19981FJ01... -
Page 4: Specifications
2 to 2000Hz Enclosure • General purpose • Aluminum Approvals • NEMA 4x • IP65 • Cable (optional) • 3-wire shielded, 0.75mm (18 AWG) • Max run 305m (1000’) Weight • 1.22 kg (2.68 lb.) Page 2 MD-256 Speed Sensor 7ML19981FJ01... -
Page 5: General Operation
General Operation The MD-256 is a digitizing speed sensor for belt scales. It connects to the shaft of a pulley and measures the shaft's rotation by sending pulses to the Milltronics integrator. This small. light-weight speed sensor features: • High resolution for accurate measurement •... -
Page 6: Installation
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 (6.25”) 102mm (4.00”) 111mm (4.36”) 1/2" NPT conduit entrance (optional PG13.5 adapter available) Page 4 MD-256 Speed Sensor 7ML19981FJ01... -
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
Distance (d) is the take up travel on the tail pulley • When adjusting the belt take up, ensure there is play on the arrestor rod. If the arrestor rod is pushed against the end of its travel slot, premature bearing wear may result. Page 6 MD-256 Speed Sensor 7ML19981FJ01... -
Page 9: Mounting To A Bend Or Snub Pulley
Arrestor Rod (cut to suit) 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” (10mm) drilled hole is required for the arrestor rod. 7ML19981FJ01 MD-256 Speed Sensor Page 7... -
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. 127mm Secure with (5”) approx. -
Page 11: Interconnection (Wiring)
The common connection used as a reference point with the integrator. GND – Ground A ground connection. Do not use this ground for the cable shield. Note: Ground the cable shield at the integrator end only! 7ML19981FJ01 MD-256 Speed Sensor Page 9... -
Page 12: Terminal Connections To Milltronics Integrators
Terminal Connections to Milltronics Integrators MD-256 +15V CompuScale Compu II Compu IIA Compu-M Compu III Accumass BW100 Accumass BW500 Determine the pulley shaft rotation on the end of the pulley shaft to which the MD-256 is attached. If the pulley shaft rotates clockwise, connect the appropriate wire to terminal 2. -
Page 13: Maintenance
Sealed bearings are used so that lubrication is not required. 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. -
Page 14: Bearing Replacement Procedure
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 Boston Bearings,... - Page 15 *7ml19981FJ01*...
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