Siemens Milltronics MD-36 User manual

Instruction Manual August 2003

MD-36 SPEED SENSOR

milltronics

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.

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: techpubs@siemens-milltronics.com

For the libraryof SMPI instruction manuals, visitour Web site: www.siemens-milltronics.com

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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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English

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.

Page 4 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL 7ML19985DB01

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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 techpubs@siemens-milltronics.com.

• 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

Page 6 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL 7ML19985DB01

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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.

Page 8 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL 7ML19985DB01

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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

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