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Data Sheet ME22

PWB-Ruhlatec Industrieprodukte GmbHSiegburger Str. 39aD-53757 Sankt AugustinGermany

www.pwb-technologies.cominfo@pwb-technologies.com

ME22 1 of 9 Rev.10.24 / 27.10.2008

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Description

The ME22 is a reliable low cost optical hollow shaft encoder that can be fixed quickly andeasily on different sizes of motor shafts.The encoder provides two square wave outputs in quadrature (90 degrees phase shifted) forcounting and direction information and one optional index channel (one pulse per rotation).The resolution of the encoder is determined by the number of counts per rotation (CPR).Power supply and signals are provided by a 5 pin Molex connector or a radial cable output.

Dimensions

Features

Size: 22.0 mm diameter x 22.5 mm length.Quick and easy assembly without touching sensitive componentsOutput channels: 2 (quadrature) + 1 optional index-channelPower supply: 5 VDCOutput type: TTL compatible, push-pull or line driverResolution up to 360 CPR (counts per rotation)No signal adjusting requiredMaximum shaft diameter: 9.52 mm (3/8")Operating temperature: -10 °C to +85 °CFrequency: 60 kHz / 75 kHz upon requestRoHS compliant

EncoderResolution (CPR)

001002004008050064100108120124125128150160200250256300360

EncoderResolution (CPR)

001002004008050064100108120124125128150160200250256300360

Motor ShaftØ Diameter (mm)

1.5002.0002.3002.5003.0003.175 (1/8")3.969 (5/32")4.0004.763 (3/16")5.0006.0006.350 (¼")8.0009.0009.525 (3/8")

Ø22.0

22.5

-0.9

Ø22.0

22.5

-0.9

300 3

ME22 2 of 9 Rev.10.24 / 27.10.2008

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Encoding Characteristics Channel A & B

Parameter Symbol Min. Typ. Max. Unit NotesStorage Temperature Ts -40 85 °COperating Temperature TA -20 85 °CHumidity Exposure 90 % RH not condensingSupply Voltage Vcc -0.5 7 VDCOutput Voltage Vo -0.5 Vcc VDCOutput Current per channel Iout -1.0 8 mAVibration 2000 Hz 20 g

Absolute Maximum Ratings

Recommended Operating Conditions

ESD Warning: Normal handling precautions should be taken to avoid static dischargedamage to the sensor.

Electrical characteristics are only effective for the range of the operating temperatures.Typical values at 25 °C and VCC = 5 VDC.

Parameter Symbol Nominal Max. Error UnitPulse Width P 180 ±75 °ePhase � 90 ±60 °ePosition Error �� 0 1.3 °m

1. on demand2. only for 1,2,4,8 CPR variant

Parameter Symbol Min. Typ. Max. Unit NotesOperating Temperature TA 0 25 85 °CSupply Voltage Vcc 4.5 5.0 5.5 VDCSupply Current (two channels) Icc 13 15 18 mASupply Current (three channels) Icc 33 35 38 mALoad Capacitance CL 100 pF

A& B ChannelHigh Level Output Voltage VoH 2.4 Vcc VDC IoH = -0.2 mALow Level Output Voltage VoL 0.4 VDC IoL = 8.0 mARise Time tr 500 / (7)2 ns / (μs)2 CL = 25 pFFall Time tf 100 / (1.3)2 ns / (μs)2 CL = 25 pF

Index ChannelHigh Level Output Voltage VoH 2.4 Vcc VDC IoH = -0.2 mALow Level Output Voltage VoL 0.4 VDC IoL = 8.0 mARise Time tr 7 μs CL = 25 pFFall Time tf 1.3 μs CL = 25 pF

RPM xN / 60 x 10-3Count Frequency f60(75)1

kHz30

ME22 3 of 9 Rev.10.24 / 27.10.2008

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Electrical interface

�(90 °e)

P (180 °e)

C (360 °e)

Channel A

Amplitude

t

S1 S2 S3 S4

Rotation direction clockwise

180 ° ± 1 ° (mechanical)

(Index not tracked)

Channel B

Definitions

Counts per Rotation (CPR):The number of bar and window pairs or increments perrevolution of the code wheel.

One Cycle (C):360 electrical degrees (°e), one period of the signal,caused by one pair of bar and window.

Pulse Width (P):The number of electrical degrees that an output is highduring one cycle. This value is nominally 180 ºe.

State Width (S):The number of electrical degrees between a transitionin the output of channel A and the neighbouringtransition in the output of channel B. There are 4 statesper cycle, each nominally 90 ºe.

Phase (�):The number of electrical degrees between the centre ofthe high state of channel A and the center of the highstate of channel B. This value is nominally 90 ºe.

Position Error (�Q):The angular difference between the actual angularshaft position and the position indicated by the encodercycle count.

Ch.B

GNDCh.AVccCh. I

Ch. BVcc Ch. A GNDCh. I

ME22 4 of 9 Rev.10.24 / 27.10.2008

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Parameter Value Tolerance UnitOuter dimensions Ø22.0 x 22.5 -0.9 mm

Required shaft length LW 9.5 +2.0 mm

Max. allowable axial shaft play of motor 0.6 - mmMax. allowable radial shaft play of motor 0.025 - mmMax. allowable eccentricity of motorshaft(concerning to the centering shoulder) 0.12 - mm

Max. allowable radial run-out error of motorshaft 0.025 - mm

Mounting screw size (DIN 84) M1.6 - -Tightening torque of the screws 15 -5 NcmHole circle 17.0 ±1.0 mmMounting boss diameter ØZ 7.1 (10.1) +0.03 mmMax. mounting boss height hZ 1.5 -0.1 mm

Mating connector contact 5x 50079-8000(Molex) housing 1x 51021-0500Total weight 7 - gMoment of inertiaof the hub with the code wheel 5.2 ±1.0 gmm2

Protection grade according to DIN 40500 IP50 - -

Shaft diameter Øw ±0.01 mm

- -

1.5 / 2.0 / 2.3 / 2.5 / 3.0 / 3.175 /3.969 / 4.0 / 4.763 / 5.0 / 6.0 /

6.35 / 8.0 / 9.0 / 9.525

hZ

ØW

LW

Mechanical Notes

Mounting considerations:

The ME22 encoder is designed to self align by using a mounting boss. The drawing showsthe configuration of the mounting boss along with the location of the mounting screw holes.Shaft diameter and tolerances are given in the above mentioned chart.

2x 1.8

17.0

Ø7.1+

0.03

2x2.8

(Ø10.1)

ME22 5 of 9 Rev.10.24 / 27.10.2008

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Encoder Motor Shaft Number of OUTPUTResolution (CPR) Diameter (mm) Channels option

001 1.500 1 : 1 Channel LF: standard version002 2.000 2 : 2 Channels with connector004 2.300 3 : 3 Channels LFC : with radial008 2.500 cable output050 3.000064 3.175 (1/8")100 3.969 (5/32")108 4.000120 4.763 (3/16")124 5.000125 6.000128 6.350 (1/4")150 8.000160 9.000200 9.525 (3/8")250

256

300360

ME22 - XXX - X.XXX - X - XXX

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

*

Ordering information

Ordering code:

Note:* other encoder resolutions on request** only two channel*** only one channel

Available accessories (no parts of standard delivery):- cable 300 mm length (UL1061 / AWG28)- adapter plates for different motors- centering gauge for different motor shafts- fastening screws DIN 84 M1.6x3

Patents: U.S 5,828,047 ; U.S 5,508,088 ; U.S 5,859,425 ; U.S 6,462,442

PWB-Ruhlatec Industrieprodukte GmbH RESTRICTED

THIS DOCUMENT AND ANY ASSOCIATED DATA CONTAIN RESTRICTED INFORMATION THAT ISPROPERTY OF PWB-Ruhlatec Industrieprodukte GmbH (PWB) AND MAY NOT BE DISCLOSED ORDUPLICATED FOR OTHERS EXCEPT AS AUTHORIZED BY PWB

INFORMATION CONTAINED IN THIS PUBLICATION MAY BE SUPERSEDED BY UPDATES. IT IS YOURRESPONSIBILITY TO ENSURE THAT YOUR APPLICATION MEETS WITH YOUR SPECIFICATIONS.

ME22 6 of 9 Rev.10.24 / 27.10.2008

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ME22 MOUNTING INSTRUCTION

1

3

5

2

4

6

Align the base plate to the motorshaft by using the centering gauge

Afterwards fix the base plate to themotor flange using two screws

Align the housing to the base plate,slide the housing onto the base plate

Press the housing into the final positionFrom this position the housing cannot belocked

... and the hub centers itself on themotor shaft

ME22 7 of 9 Rev.10.24 / 27.10.2008

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ATTENTION!The encoder is so designed that it may be assembled only one time, otherwise the guarantee will be voided.Note: see IMPORTANT NOTICE (page 9)

ME22 MOUNTING INSTRUCTION

7 8

ACCESSORIES

Centering gauge for centering the ME baseplate on the motor flange or an adapter plate

Now the housing can be locked Turn the housing into its final position,the encoder is now ready for use

Screws DIN84 M1.6 X 3

Customized adapter plate

Standard cable length 300 mm(UL1061 / AWG28)

ME22 8 of 9 Rev.10.24 / 27.10.2008

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IMPORTANT NOTICE

The encoder is so designed that it may be assembled only one time, otherwise the guaranteewill be voided.The guarantee will be voided by misuse, accident, modification, unsuitable physical oroperating environment, operation in other than the specified operating environment, or failurecaused by a product for which PWB-Ruhlatec Industrieprodukte GmbH is not responsible.

PWB-Ruhlatec Industrieprodukte GmbH reserves the right to make corrections,modifications, enhancements, improvements, and other changes to its products and servicesalso datasheets at any time.

ME22 9 of 9 Rev.10.24 / 27.10.2008