Siemens Milltronics MD-36 User manual

Instruction Manual August 2003
MD-36 SPEED SENSOR
milltronics

© Siemens MilltronicsProcessInstruments Inc. 2003
Safety Guidelines
Warning notices must be observed to ensure personal safety as well as that of others, and to
protect the product and the connected equipment. These warning notices are accompanied
by a clarification of the level of caution to be observed.
Qualified Personnel
This device/system may only be set up and operated in conjunction with this manual.
Qualified personnel are only authorized to install and operate this equipment in accordance
with established safety practices and standards.
Warning: This product can only function properly and safely if it is correctly transported,
stored, installed, set up, operated, and maintained.
Note: Always use product in accordance with specifications.
Copyright Siemens Milltronics Process
Instruments Inc.2003.AllRights ReservedDisclaimer of Liability
This document is available in bound version and in
electronic version. We encourage users to
purchase authorized bound manuals, or to view
electronic versions as designed and authored by
Siemens Milltronics Process Instruments Inc.
Siemens Milltronics Process Instruments Inc. will
not be responsible for the contents of partial or
whole reproductions of either bound or electronic
versions.
While we have verified the contents of
this manual for agreement with the
instrumentation described, variations
remain possible. Thus we cannot
guarantee full agreement. The
contents of this manual are regularly
reviewed and corrections are included
in subsequent editions. We welcome
all suggestions for improvement.
Technical data subject to change.
MILLTRONICS®is a registered trademark of Siemens Milltronics Process Instruments Inc.
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: [e-mail]
For the libraryof SMPI instruction manuals, visitour Web site: www.siemens-milltronics.com

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Table of Contents
Table of Contents
Introduction ..........................................................................................................................3
Safety Notes .............................................................................................................................................3
Product Warnings .........................................................................................................................3
Milltronics MD-36 Speed Sensor ........................................................................................................4
The Manual ...............................................................................................................................................4
Specifications ......................................................................................................................5
Operation ..............................................................................................................................7
MD-36/MD-36A/MD-36SS Operation .................................................................................................7
MD-36 IS Operation ................................................................................................................................7
Dimensions ..........................................................................................................................8
MD-36, MD-36A, MD-36 IS .........................................................................................................8
MD-36SS ........................................................................................................................................10
Mounting ............................................................................................................................12
Floating Pulley Mount ................................................................................................................12
Fixed Shaft Mount .......................................................................................................................14
Interconnection .................................................................................................................15
MD-36 Speed Sensor/Integrator Connection ......................................................................15
MD-36 IS Speed Sensor/Isolator/Integrator Connection ..................................................15
Wiring Diagram (MD-36 IS only) ..............................................................................................16
Parts Lists ...........................................................................................................................17
MD-36/MD-36A/MD-36 IS Parts List ......................................................................................17
MD-36SS Parts List .....................................................................................................................19
Maintenance ......................................................................................................................21

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Table of Contents

7ML19985DB01 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL Page 3
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Introduction
Safety Notes
Special attention must be paid to warnings and notes highlighted from the rest of the text
by grey boxes.
Safety marking symbols
Product Warnings
WARNING: means that failure to observe the necessary
precautions can result in death, serious injury, and/or
considerable material damage.
CAUTION: means that failure to observe the necessary precautions can
result in considerable material damage.
Note: means important information about the product or that part of the operating
manual.
Alternating Current
Direct Current
Earth (ground) Terminal
Protective Conductor Terminal
WARNINGS:
♦ Repair of this equipment shall be carried out bysuitably trained
personnel in accordance with the applicable Codes of Practice.
♦ If the equipment is likely to come into contact with aggressive
substances, then it is the responsibility of the user to use suitable
precautions that prevent it from being adversely affected.
♦ The MD–36 Speed Sensors are to be used only in the manner outlined
in this manual or protection provided to the equipment may be
impaired.

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Milltronics MD-36 Speed Sensor
The Milltronics MD-36 is a general purpose and hazardous rated speed sensor. The
sensor, coupled to the motor or pulley shaft, converts the rotation of its input shaft into an
encoded speed signal. The speed signal is transmitted to the integrating electronics for
use in calculating the rate of material flow.
Siemens Milltronics provides a full range of electronic integrators:
The MD-36 sensors can also be used with older model Siemens Milltronics integrators:
For further information about Siemens Milltronics products,
go to www.siemens-milltronics.com.
The Manual
This manual will help you set up your MD-36 Speed Sensor for optimum performance. We
always welcome suggestions and comments about manual content, design, and
accessibility.
Please direct your comments to [e-mail].
• Compuscale III • Milltronics BW 100 • Milltronics BW 500
•Compuscale
•CompuscaleII
•CompuscaleIIA
•Compu-M
Notes
• Please follow the installation and operating procedures for a quick, trouble-free
installation and to ensure the maximum accuracy and reliability of your Siemens
Milltronics weighing system.
• This manual applies to the MD-36 Speed Sensors only. Please consult the
separate integrator and belt scale manuals for operating instructions.

7ML19985DB01 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL Page 5
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Specifications
Power
• MD-36/MD-36A/MD-36SS: +15 V DC, 25 mA from integrator
• MD-36 IS: +5, – 25 V DC from IS Switch Isolator
Temperature
• – 40 to 55 °C (–40 to 130 °F)
Input
• shaft rotation 0 to 2,000 rpm, bi-directional
Output
MD-36/MD-36A/MD-36SS:
• open collector sinking output, max. 25 mA at 15 V DC
• 36 pulses / revolution
• 0 to 2,000 rpm = 0 to 1200 Hz
MD-36 IS:
• load current: 0 – 15mA
• 36 pulses per revolution
• 0 to 2000 rpm = 0 to 1200 Hz
Input: Output
• 1:1 (speed ratio)
Enclosure
• MD-36 and MD-36 IS: aluminum rating – Type 4/NEMA 4/IP 65
• MD-36A: aluminum
• MD-36SS: 304 stainless steel

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Approvals
• MD-36: CSA, FM – Class II, Gr. E, F&G, Class III, CE
• MD-36 IS:
• ATEX: II 2 G, EEx ia IIC T6 (with suitable IS Switch Isolator)
• CSA/FM (with suitable IS Switch Isolator or Switch Amplifier): Class I, Div. 1,
Groups A,B,C, and D. Also Class II, Div. 1, Groups E,F, and G system approval
•CE
• MD-36A, MD-36SS: CE
Switch and Isolator Approvals
Proximity Switch ApprovalRatings (Pepperl+Fuchs #SJ3.5-N)
• ATEX: II 2 G, EEx ia IIC T6 (with suitable IS Switch Isolator)1
• CSA/FM (with suitable IS Switch Isolator or Switch Amplifier): Class I, Div. 1, Groups
A,B,C, and D. Also Class II, Div. 1, Groups E,F, and G system approval
IS Switch Isolator (Pepperl+Fuchs #KFA5-SOT2-Ex2 and #KFA6-SOT2-Ex2)
• ATEX: II (1) G, [EEx ia] IIC
• CSA/FM: Class I, Div. 1, Groups A,B,C, and D. Also Class II, Div. I, Groups E,F, and G.
Cable (optional)
• Belden 8770, 3 wire shielded, 0.75 mm2(18 AWG) or equivalent
• max. run 305 m (1000 ft.)
Note: The Approval Ratings for the Proximity Switch and the IS Switch Isolator are
the property of Pepperl+Fuchs. Copies of these Approval Certificates may be
obtained at www.siemens-milltronics.com.
1. Based on the ATEX rating of the NAMUR slotted sensor and CSA/FM system
approvals.

7ML19985DB01 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL Page 7
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Operation
The speed sensor consists of a main shaft rotating in a bearing assembly fixed to the
enclosure. The shaft turns a toothed disk divided into 36 teeth, each separated by a gap
equal to the tooth width. In the MD-36/MD-36A/MD-36SS, the encoder card is mounted
so that the two optocouplers straddle the disk’s teeth.
MD-36/MD-36A/MD-36SS Operation
Power from the integrating device energizes the two optocoupler LEDs and feeds the
5Vdc regulator. The 5Vdc bus powers the logic circuitry and the output driver transistors.
As the shaft rotates, the 36-tooth wheel modulates the light crossing within each
optocoupler. The resulting outputs are two 50% duty cycle square waves that are phase
shifted by 90 degrees electrical or 1/4 cycle (one cycle of 360 degrees electrical
corresponds to the width of one tooth and one gap). This configuration provides
directional discrimination.
The optocouplers’ square wave outputs are converted into clockwise (CW) and
counterclockwise (CCW) square wave output signals by the intermediate logic. When the
shaft rotates in a CW direction, the logic produces pulses at the CW output and the CCW
output is disabled. When the shaft rotates in a CCW direction, the logic produces pulses
at the CCW output and the CW output is disabled.
The speed sensor is immune to any external vibration that would cause the toothed
wheel to oscillate 1/4 cycle (1/2 tooth width or 5° of shaft rotation) or less.
MD-36 IS Operation
The MD-36 IS Speed Sensor contains a Pepperl + Fuchs, NAMUR rated, inductive
proximity sensor, model # SJ3.5-N, consisting of an oscillator and a coil. The oscillator
creates a fequency which is emitted from the coil and out the face of the sensor.
When a metal target enters this radiated field, eddy currents are indicated on this target.
As the target moves closer to the sensor, the energy required from the oscillator
increases. The IS switch isolator monitors the change in the oscillator load, triggering the
output when a predetermined level is reached.

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Dimensions
MD-36, MD-36A, MD-36 IS
1/2” NPT plug
(two places)
142 mm
(5.6”)
71 mm
(2.8”)
71 mm
(2.8”)
142 mm
(5.2”)
218 mm
(8.6”)
112 mm
(4.4”)
56 mm
(2.2”)
Front View