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mRS001

Rotation Sensor

Document No. 10678, Revision F

December 2010

1997-2005 CMC Industrial Electronics Ltd.

ROTATION SENSOR

1-WIRE

INTRINSICALLY SAFE mRS001

This page intentionally left blank.

mRS001 Rotation Sensor Technical Manual /i

CMC INDUSTRIAL ELECTRONICS LTD Phone: (604) 421-4425 Toll Free: (888) 421-4425 Fax: (604) 421-7734 www.cmciel.com [email protected]

The Industry Leader in HazMon Technology

Table of Contents

1. Overview .............................................................................................................................. 1

2. Description of Indicators ...................................................................................................... 3

3. Installation............................................................................................................................ 4

3.1 Mounting using the mRS001-EK ................................................................................... 5

3.2 Mounting using a fabricated bracket ............................................................................. 8

4. Communications ................................................................................................................ 11

5. Specifications ..................................................................................................................... 13

Appendix 1 - Installation Drawings ............................................................................................ 14

Table of Figures

Figure 1 - Illustration of Indicators ............................................................................................... 3

Figure 2 Typical mRS001-EK Mounting ................................................................................... 7

Figure 3 - Typical Fabricated Installations ................................................................................... 8

Figure 4 - Typical Network Layout ............................................................................................. 12

mRS001 Rotation Sensor Technical Manual /ii



Revision Notes

First Release January 21, 2005

Revision A May 11, 2005

Miscellaneous text changes and update dimensions drawing

Revision B May 20, 2005

Update mechanical installation details to include grommet mounting system

Revision C May 20, 2005

Update illustration showing new code wheel

Revision D April 17, 2008

Add the mRS001-EK to the manual

Revision E December 17, 2010

Update exploded view drawing 11031

Revision F January 24, 2012

Update parts list drawing 11031

mRS001 Rotation Sensor Technical Manual /iii




mRS001 Rotation Sensor Technical Manual /1



1. Overview

The mRS001 Rotation Sensor is designed to determine the shaft speed of rotating devices. Measurements from 1 to 1000 RPM are possible. The device uses a unique code wheel that attaches to the shaft with a single or 6mm screw. A rugged shaft mounted housing, the mRS001-EK, is available to facilitate mounting to the machines output shaft. The housing is free hanging and does not require any brackets or safety shields. Alternately a high force magnet assembly, the mRS001-MG, is available to attach the code wheel to the machines output shaft.

Each sensor has a unique digital serial number and will be automatically recognized by CMCIEL Bus Converters. Communications utilize the Dallas 1-Wire

bus standard. Power for the sensor

is supplied by the bus system.

The sensors are packaged in an industrial grade plastic housing utilizing a fully potted construction. Each sensor comes complete with 2 meters of heavy-duty industrial cable rated for use in direct sunlight. The cable is terminated with an RJ-11 connector for direct connection to CMCIEL wiring accessories.

When used with the mBC081 Bus Converter the device is Intrinsically Safe.




2. Description of Indicators

mRS001

Rotation

Sensorwww.cmciel.com

STATUS

ROTATION

CMC Industrial

Electronics

Figure 1 - Illustration of Indicators

The sensor requires no settings. There are 2 indicator lamps:

Description Color Flash Rate Operation

Status Green 1

2

3

4

5

6

Ok, no communications

Ok, communication active

Power on self test fault

Calibration parameter fault

Firmware fault

Serial number fault

Rotation Red - Flashes whenever a code wheel magnet crossing is detected




3. Installation

The rotation sensor can be mounted using a fabricated bracket or a factory manufactured enclosure kit, the mRS001-EK. The mRS001-EK is a free-standing enclosure that hangs from the drive shaft of the device. No brackets or guards are required.

3.1 Mounting using the mRS001-EK

The following is required before attempting installation:

1. The shaft of the rotating device must be drilled and tapped with a x 13 threaded hole to a depth of at least 1.5. It is extremely important to ensure this hole is centered and parallel to shaft. Excessive eccentricity will cause excess bearing wear or damage;

2. A field interconnect must be located within 1.8m of the rotation sensor;

3. The direction of the rotating shaft must be known.

See drawing 11031 in Appendix 1 for an exploded view of the enclosure with item numbers and mounting details. The following steps are required to install the housing:

1. Unpack the mRS001 Rotation Sensor and the mRS001-EK Housing Kit and check the supplied parts with the parts list on page 3 of drawing 11031.

2. Install the drive shaft (item 1) in the machines output shaft. Thread the shaft as far as possible into the shaft. Secure the shaft with a 7/16 open end wrench and tighten the jam nut (item 20) to secure the shaft;

************************************************************************************************************

Caution:

Do not clamp, hold or damage the drive shaft seal area shown below.

Damaging these surfaces will destroy the shaft seal.

Do not damage this

surface

Use 7/16" open wrench to

hold shaft here only

************************************************************************************************************




3. Determine the direction of rotation of the shaft. The rotation sensor can be mounted either on the main housing or on the lid depending on the direction of rotation. If the shaft is turning counter-clockwise when facing the installed sensor drive shaft, mount the rotation sensor in the main housing. First pass the sensors cable through the conduit opening in the base of the enclosure and place the sensor in position in the housing. The rubber grommets should be against the inside of the housing. Use the 2 - 4-40 x 1 screws (item 2) supplied with the rotation sensor to mount the sensor. Install the screws from the outside of the main housing; pass them through the sensor; the flat washer (item 7) and finally the ny-lock nut (item 8). Tighten to compress the rubber grommets 1/16. Use the 2 - 4-40 x screws (item 17) and nylock nuts (item 19) supplied with the enclosure to plug the 2 small holes in the enclosures lid. If the shaft is turning clockwise when facing the installed sensor drive shaft, mount the rotation sensor in the lid of the housing. Do not install the cable in the housing at this time. Use the 2 - 4-40 x 3/4 screws (item 17) supplied with the housing to mount the sensor. Install the screws from the outside of the lid, pass them through the sensor, the flat washer (item 7) and finally the ny-lock nut (item 19). Tighten to compress the rubber grommets 1/16. Use the 2 - 4-40 x 1 screws (item 2) and nylock nuts (item 8) supplied with the sensor to plug the 2 small holes in the main housing.

************************************************************************************************************

Caution:

Using the 1 screws to mount the sensor in the lid will cause permanent damage to the

code wheel assembly.

************************************************************************************************************

4. Prepare the code wheel assembly by placing the star washer (item 12) and flat washer (item 21) on the x 20 x 1.5 socket head cap screw (item no. 13) and then threading the screw into the code wheel. The screw head should be on the recessed side of the code wheel with the flat washer against the code wheel. Slide the bushing (item no. 10) on the screw with the narrow end of the bushing away from the code wheel.

5. Inspect the code wheel shaft and housing seal for damage, if either is damaged do not install the housing. Carefully push the housing on the drive shaft. Be careful not to damage the rubber seal in the housing. Rock the housing back and forth to ensure the seal is free and not pinched by the shaft as you are pressing the shaft into the seal and bearing.

6. Apply removable thread locking compound to the threads of the code wheel screw and thread it into the drive shaft. Ensure the bearing and seal have not been damaged and that the drive shaft and bushing are fully engaged in the bearing. Tighten the screw to 50 inch-pounds of torque. The enclosure should rotate freely back and forth on the drive shaft.




************************************************************************************************************

Caution:

Over tightening the shaft screw will permanently damage the plastic code wheel. Use a

torque wrench to tighten the screw to the required 50 inch-pounds torque and be certain

to use removable thread locking compound on the screw threads. Failure to observe

these requirements may result in the shaft separating from the machine.

************************************************************************************************************

7. If the sensor was installed in the lid, thread the cable into the conduit opening on the bottom of the housing. Carefully apply the gasket to the lid using the screws to hold the gasket in place. Screw the lid to the main housing using the 6 - #8 x 1 self-tapping screws. Tighten the screws carefully to compress the gasket. Do not over tighten the screws. Examine the lid of the enclosure to insure the gasket remained in place and is fully compressed.

8. Start the machine and observe the shaft and housing. There should be a minimum of eccentricity and the housing should stationary and free of vibration. Verify the sensors output with the known speed of rotation of the shaft.

Figure 2 Typical mRS001-EK Mounting




3.2 Mounting using a fabricated bracket

Drive

Shaft

Po

sitiv

e R

ea

din

g

Rigid mounting

bracket

0.

25

mRS001

Rotation

Sensor

www.cmciel.com

STATUS

ROTATION

CMC IndustrialElectronics

Po

sitiv

e R

ea

din

g

0.

25

Rigid mounting

bracket

Mounting

Detail

Drive

Shaft

0.30"

Figure 3 - Typical Fabricated Installations

The encoder wheel target is located on the sensors face. Mount the sensor to the bracket using the supplied 4-40 x 1 screws with flat washers and nylon locking nut as shown above. Tighten screws to compress the grommet 1/16. Do not over tighten the screws. Install the sensor so the code wheel magnet centers pass over the sensors target mark with an average distance from the code wheel of 0.25 to 0.40. The direction the magnets move across the sensor face sensor determines the rotation direction. Observe the direction arrow on the face of




the sensor. An optional magnet assembly is available to attach the code wheel to the machines shaft. Order part number mRS001-MG.

*** IMPORTANT SAFETY NOTICE ***

1. The mounting bracket for sensor must be rigid and able to withstand loads from

unexpected sources such as personnel standing or leaning against the bracket.

2. The mounting surface for the code wheel must be flat and perpendicular to the

shaft.

3. Safety guards may be required to protect from personal injury from rotating

components or the disengagement of the code wheel.

It is the sole responsibility of the installer to ensure the mounting method and safety

guards meet the requirements of the local building codes and safety agencies.

*** PERSONAL INJURY WARNING ***

The optional magnet used to attach the code wheel to the shaft has a very strong

attractive force and will move suddenly and with great force towards any ferrous or

magnetic material. Use extreme caution when handling the code wheel.




4. Communications

The mRS001 Rotation Sensor is a fully compliant Dallas 1-Wire device. The sensor is supplied

with 2m of cable terminated with a RJ-11 plug. The sensor connects to the CMCIEL wiring system through a CMCIEL Field Interconnect.

The output of the sensor is a single signed 16 bit word. The resolution is 1 RPM and the range is 1 to 1000 RPM. The reading is averaged and updated once per second for RPMs greater than 10. For RPMs less than 10, the pulse frequency determines the update rate.

The sensor detects the direction of rotation and will provide a negative value for reverse rotations. Observe the arrow next to the target on the sensor to determine the positive rotation direction.

The sensor requires a bus converter to convert the Dallas 1-Wire signaling system to a system

recognized by commercial programmable controllers. The Bus Converters provide a Modbus485 RTU interface. CMCIEL manufactures Bus Converters for both commercial and hazardous areas. The RPM is represented as a single signed word in the Bus Converter Modbus register map. The Bus Converters will automatically acquire the serial number of the sensor on request.

As a Dallas 1-Wire device, the sensor value is returned using the read scratch function as 3

bytes, the first 2 bytes a signed word containing the RPM and the 3rd byte the Dallas 1-Wire

- 8

bit CRC. The family code for the sensor is 160 decimal or A0 Hex. The sensor responds to the following Dallas function codes:

Code Decimal Code Hex Function

240 F0 Search ROM

85 55 Match ROM

15 0F Read ROM

51 33 Read ROM

204 CC Skip ROM

190 BE Read Scratch, 3 bytes, low byte + high byte + Dallas 8 bit CRC

Refer to Dallas Semiconductor documentation for complete details on the operation of the Dallas 1-Wire

signaling system.




Figure 4 - Typical Network Layout




5. Specifications

Description Characteristic

Sensor bus Voltage Current Communications

5 VDC 3.0 mA max 1-Wire

Bus

Position Resolution Accuracy Quadrature Magnetic Encoder

1 - 1000 RPM 1.0% full scale 6 divisions/revolution

Environment Temperature Relative Humidity

-40 to 70C (-40 to 158F) 0 to 95% non-condensing

Sensor Dimensions Length Width Depth

74mm (2.9in) 33mm (1.3in) 12mm (0.45in)

Housing Kit Dimensions Length Width Depth

152mm (6.0in) 102mm (4.0in) 51mm (2.0in)




Appendix 1 - Installation Drawings

The following is a list of the installation drawings in this appendix:

10679C Dimension Details

10704C Installation Details

11031 Shaft Mount Housing Exploded View




CO

PY

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HT

20

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1

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module

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11031

B

Item 1 2 3 4 5 6 7 8 9 10

11

12

13

14

15

16

17

18

19

20

21

22

Part

no.

11275

4-4

0P

HS

S1.0

11278

S012025070T

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1/2

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SA

N

11279

Quantity

1 2 1 1 1 1 2 2 4 1 1 1 1 1 1 6 2 1 2 1 1 1

Description

Drive s

haft, 1/2

" x 1

3 thre

ads

#4-4

0 x

1"

pan h

ead m

achin

e s

cre

w (

supplie

d w

ith m

RS

001)

Housin

g

Shaft s

eal

Bearing

Bearing re

tain

er

#4 fla

t w

asher (s

upplie

d w

ith m

RS

001)

#4 -

1/4

" hex n

ylo

ck n

ut (

supplie

d w

ith m

RS

001)

#8 x

5/8

" T

ype B

self tappin

g s

cre

ws

Bushin

g

Code w

heel (

supplie

d w

ith m

RS

001)

1/4

" S

pring lo

ck w

asher

1/4

" x 2

0 x

1.5

" socket head c

ap s

cre

w

mR

S001 R

ota

tion S

ensor

Gasket

#8 x

1"

type B

self tappin

g s

cre

ws

#4-4

0 x

3/4

" pan h

ead m

achin

e s

cre

w

Pro

duct l

abel

#4 -

1/4

" hex n

ylo

ck n

ut

1/2

" x 1

3 h

ex ja

m n

ut

1/4

" flat w

asher

Type A

N, nom

inal 0

.50"O

D

Lid

mrs001 rotation sensor - owfs development site · 1997-2005 cmc industrial electronics ltd. ... the...

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