Siemens Milltronics MD-36 Instruction Manual

Instruction Manual August 2003

milltronics

MD-36 SPEED SENSOR

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 Personne l

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

Disclaimer of Liability

Instruments Inc. 2003. All Rights Reserved

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.

MILLTRONICS®is a registered trademark of Siemens Milltronics Process Instruments Inc.

Contact SMPI Tech nical Publications at the following ad dress:

Technical Publications
Siemens Milltronics Process Instruments Inc.
1954 Technology Drive, P.O. Box 4225
Peterborough, Ontario, Canada, K9J 7B1
Email: [e-mail]

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.

For the library of SMPI instruction manuals, visit our Web site: www.siemens-milltronics.com

© Siemens Milltronics Process Instruments Inc. 2003

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

Table of Contents

mmmmm

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

i

mmmmm

Table of Contents

ii

Introduction

Safety Notes

Special attention must be paid to warnings and notes highlighted from the rest of the text
by grey boxes.

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.

Safety marking symbols

English

mmmmm

Alternating Current

Direct Current

Earth (ground) Terminal

Protective Conductor Terminal

Product Warnings

WARNINGS:

♦ Repair of this equipment shall be carried out by suitably 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.

7ML19985DB01 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL Page 3

mmmmm

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.

English

Siemens Milltronics provides a full range of electronic integrators:

• Compuscale III • Milltronics BW 100 • Milltronics BW 500

The MD-36 sensors can also be used with older model Siemens Milltronics integrators:

•Compuscale

•Compuscale II

For further information about Siemens Milltronics products,
go to www.siemens-milltronics.com

•Compuscale IIA

•Compu-M

.

The Manual

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.

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]

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

.

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

English

mmmmm

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

7ML19985DB01 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL Page 5

mmmmm

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)

English

Switch and Isolator Approvals

• 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

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.

Proximity Switch Approval Ratings (Pepperl+Fuchs #SJ3.5-N)

• 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

1

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.)

1.

Based on the ATEX rating of the NAMUR slotted sensor and CSA/FM system
approvals.

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

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.

English

mmmmm

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.

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

mmmmm

Dimensions

MD-36, MD-36A, MD-36 IS

English

Front View

71 mm

(2.8”)

142 mm

(5.6”)

142 mm

(5.2”)

218 mm

(8.6”)

71 mm

(2.8”)

1/2” NPT plug
(two places)

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

56 mm

(2.2”)

112 mm

(4.4”)

Side View

English

mmmmm

117 mm

(4.6”)

61 mm

(2.4”)

16 mm (0.63”)

Ø shaft

84 mm (3.3”)

124 mm (4.9”)

ref. 61 mm

(2.4”)

213 mm

(8.4”)

114 mm

(4.5”)

21mm (0.8”)

6 mm (0.25”)

Ø shaft

(two places)

7ML19985DB01 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL Page 9

mmmmm

MD-36SS

Front View

English

152 mm

(6.0”)

19 mm
(0.75”)

76mm (3.0”)

152 mm

(6.0”)

76 mm

(3.0”)

239 mm

(9.4”)

cable connector for
3 to 9 mm (0.125” to

0.25”) o.d. cable

38 mm

(1.5”)

51 mm

(2.0”)

102 mm

(4.0”)

Page 10 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL 7ML19985DB01

Side View

127 mm

(5.0”)

English

mmmmm

61 mm

(2.4”)

16mm (0.63”)

Ø shaft

(ref.) 76 mm

(3.0”)

216 mm

(8.5”)

114 mm

(4.5”)

86 mm (3.4”)

127 mm (5.0”)

21 mm (0.8”)

6 mm (0.25”)

shaft

(two places)

Ø

7ML19985DB01 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL Page 11

mmmmm

Mounting

The MD-36 speed sensor models can be coupled to a tail pulley, bend pulley, or motor
shaft.

English

There are two methods of attaching the sensor: floating and fixed.

Floating Pulley Mount

The input shaft and bearing assembly bear the weight of the speed sensor. The unit’s
arresting bracket stops the speed sensor from rotating with the shaft.

The arresting bracket straddles a section of angle iron installed by the customer. Make
sure to fasten the anti-rotation spring.

see

Pulley Shaft

pulley shaft

on page 13

MD-36

series

B

Arresting bracket.

B

angle iron (customer
supplied)

Shorten if required. See

Arresting Bracket

page13.

spring

on

Notes:

• When mounting the speed sensor, ensure that the shaft alignment is true to avoid
stresses on the shaft bearing.

• For preferred mounting locations, refer to the associated belt scale or weigh
feeder application drawings.

Page 12 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL 7ML19985DB01

Pulley Shaft

M8 or 5/16-18 UNC set screw
(customer supplied)

Arresting Bracket (B-B Cross Section)

127 mm

(approx)

64 mm

(2.5”)

(5”)

25 mm

(1”)

English

mmmmm

16 mm (0.630”) min.

16.07 mm (0.633”) max.

.254 mm (.01 0") A

A

secure with
hook or bolt

angle iron

anti-rotation spring

arresting
bracket

Notes:

• When tail or bend pulley is not supplied by Siemens Milltronics, machining on tail/
bend pulley shaft (see

Pulley Shaft

sensor is done by customer.

• Arresting bracket is an anti-rotation device only and must not secure or support
the speed sensor. Bearing life is greatly reduced if speed sensor is not free to
"float." Use anti-rotation spring to prevent mechanical oscillation of speed sensor.

• Grease mating surfaces to prevent seizing.

above) to accommodate Milltronics speed

7ML19985DB01 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL Page 13

Fixed Shaft Mount

”

mmmmm

Side View

English

motor

13 mm (0.5”)
optimum
dimension

motor shaft

rubber hose

hose clamp (typ)

16 mm (0.63”) Ø shaft

MD-36

Series

customer supplied
mounting bracket
(remove supplied
arresting bracket)

0.8 mm (0.03)
max. shaft
offset

Front View

8 mm (0.313”) two
places

guard (to suit)

shaft rotation

W

C

C

C

W

Page 14 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL 7ML19985DB01

Interconnection

CAUTION:

• All wiring must be done in accordance with approved conduit, boxes, and
fittings, and to procedures in accordance with all governing regulations.

• Flexible conduit is recommended so excess stress is not applied to the
shaft bearings

• Interconnection between the speed sensor and the integrator should be
made with 3-wire shielded, 18 AWG cable (Belden 8770 or equivalent).

• Ground the shield at the integrator ONLY!

MD-36 Speed Sensor/Integrator Connection

MD-36 Compu III BW 100 BW 500

Description Terminal TB1 TB1 TB1

English

mmmmm

+ 15 V DC

Speed Out

1

(CW)

Speed Out

(CCW)

Common

Ground

1.

To determine direction of rotation, see

1 30819

2

2

3

(31)

(31) (7) (16)

(7) (16)

432617

G

N/C

3

N/C N/C

Front View

mount-

ing on page 14.

2.

Terminal positions in brackets denote that only one signal
may be connected at one time.

3.

N/C = No Connection

MD-36 IS Speed Sensor/Isolator/Integrato r Conn ection

MD-36 IS

IS Switch Isolator

(P&F #KFA5-S0T2-Ex2)

BW 100 BW 500

Terminal Terminal TB1 TB1

3

4

7ML19985DB01 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL Page 15

1
3
7716
81714

Wiring Diagram (MD-36 IS only)

mmmmm

English

Hazardous Area

Siemens Milltronics

MD-36 IS

S

S

I

I

G

G

112233445 5 6 7 8 9 10 11 12 13 14 15

34

2 conductor, 18AWG

shielded cable

(customer supplied)

Non-Hazardous Area

IS Switch Isolator

(Pepperl+Fuchs #KFA5-SOT2-Ex2

(customer supplied)

S

E

I

X

G

C

Siemens Milltronics

SIG

EXE-

SHLD

16

14

7

17

Refer to integrator installation
diagram.

Note: The 115V version is shown. If 230V is required, use isolation barrier Pepperl +

Fuchs #KFA6-SOT2-Ex2.

115 Vac
See Note
below.

Integrators

20

BW 50 0

BW 10 0

11

Page 16 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL 7ML19985DB01

Parts Lists

MD-36/MD-36A/MD-36 IS Parts List

Item Description Qty Item Description Qty

1Enclosure116MD-36/36A: Speed Pickup Card Ver.3 1

2 Screw, 6-32 x 5/16 3 MD-36 IS: Mounting Plate 1

3 External Lockwasher #6 5 17 Binding Screw, Slot, 6 - 32 x 5/8 4

4 Gasket, Bearing Assembly 1 18 Cap Screw, Socket, 10 - 32 4

5 MD-36 Bearing Assembly 1 19 Lockwasher, Split #10 4

5a MD-36A Bearing Assembly 1 20 Binding Screw, Slot, 4 - 40 3

6 MD-36 Shroud 1 21 Hex Nut, 6 - 32 2

7 Disc 36 Tooth 1 22 Terminal Block CSA 1

8 Disc Hub 1 23 Gasket, Cover 1

9 Slot Round Head Screw 1/4" 4 24 Threaded Plug, 1/2 NPT 2

10 Lockwasher Split 1/4" 4 25 Enclosure Arresting Bracket 1

11 Enclosure Cover 1 26 Spring Spnr. B-604 1

12 Extension Shaft 1 27 Bolt, Hex 5/16 - 18 x 1 1/4 2

13 Set Screw Socket, 8-32 x 3/16 2 28 Nut, Hex 5/16 - 18 2

14 External Lockwasher #4 3 29 Washer, Flat 5/16 2

15 Bushing 2 30 Lockwasher Split 5/16 2

English

mmmmm

Side View

7ML19985DB01 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL Page 17

mmmmm

Front View

English

Note: Shown with cover removed.

Bearing Assembly Replacement

1. Turn off supply power from integrator and then remove speed sensor from
mounting.

2. Remove cover (#11) and the four bearing assembly mounting screws (#18) located
externally around shaft.

3. Pull out bearing assembly (#5) c/w card, disc hub, disc, and mounting brackets.

4. Remove screws (#17), bushing (#15), and card (#16).

5. Remove speed sensor shroud screws (#2).

6. Loosen hex screw in shaft and remove extension shaft, disc hub, and disc to free
bearing assembly.

Page 18 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL 7ML19985DB01

MD-36SS P arts List

Side Vi

Item Description Qty Item Description Qty

1 Enclosure 1 15 SS Screw, Socket, 10 - 32 4

2 Screw, 6-32 x 5/16 3 16 Lockwasher, Split #10 SS 4

3 External Lockwasher #6 5 17 Binding Screw, Slot, 4 - 40 x3/8 3

4 Gasket, Bearing Assembly 1 18 Hex Nut, 6 - 32 2

5 Bearing Assembly 1 19 Terminal Block 1

6 MD-36 Shroud 1 20 Cable Connector 1

7 Disc 36 Tooth 1 21 Enclosure Arresting Bracket 1

8 Disc Hub 1 22 Locknut T&B 1/2 in # 141 1

9 Extension Shaft 1 23 Spring Spnr. B-604 1

10 Set Screw Socket, 8-32 x 3/16 2 24 Bolt, Hex 5/16 - 18 x 1 1/4 SS 2

11 External Lockwasher #4 3 25 Lockwasher Split 5/16 SS 2

12 Bushing 3 26 Nut, Hex 5/16 - 18 NC SS 2

13 Speed Pickup Card Ver.3 1 27 SS Screw, Socket, 10 - 32 2

14 Binding Screw, Slot, 6 - 32 x 5/8 4

ew

English

mmmmm

7ML19985DB01 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL Page 19

mmmmm

F

ront View

English

Note: Shown with cover removed.

Bearing Assembly Replacement

1. Turn off supply power from integrator and then remove speed sensor from
mounting.

2. Open cover and remove the four bearing assembly mounting screws (#15) located
externally around shaft.

3. Pull out bearing assembly (#5) c/w card, disc assembly, and MD-36 shroud

4. Remove screws (#14), bushing (#12), and card (#13).

5. Remove MD-36 shroud screws (#2) and MD-36 shroud c/w terminal block (#19) and
card (#13).

6. Loosen hex screw in shaft and remove extension shaft, disc hub, and disc to free
bearing assembly.

Page 20 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL 7ML19985DB01

Maintenance

The speed sensor electronics normally requires no maintenance; however, a program of
periodic checks would be beneficial. The enclosure and circuit board, or NAMUR sensor
should be cleaned if necessary, but only when the power is disconnected using a vacuum
cleaner and a clean, dry paint brush. Check all electrical contacts for corrosion and
arcing.

The speed sensor bearing should be periodically checked for corrosion, wear and
seizing. The bearing‘s life is dependent upon the mounting, the severity of the application,
and surrounding environment.

English

mmmmm

7ML19985DB01 Milltronics MD-36 Speed Sensor – INSTRUCTION MANUAL Page 21

Notes

Notes

www.siemens-milltronics.com

Siemens Milltronics Process Instruments Inc.
1954Technology Drive, P.O. Box 4225
Peterborough, ON, Canada K9J 7B1
Tel: [phone] Fax: [phone]
Email: [e-mail]

Siemens Milltronics Process Instruments Inc. 2003

Subject to change without prior notice

Rev. 1.1

*7ml19985DB01*

Printed in Canada