ACU-RITE SENC 50 Reference guide

Brand: ACU-RITE

Model: SENC 50

Type: Reference guide

REFERENCE MANUAL

SENC 50

ACU-RITE

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Page

Introduction / Supplied items ................................................. 2

Key Points / Tolerances ............................................................ 3

Linear Encoder Dimensions .................................................... 4

Spar Dimensions ..................................................................... 5

Mounting Requirements ......................................................... 6

Typical Mounting ..................................................................... 7

Encoder Installation Procedure ................................................ 8

Page

Checking the Installation ..................................................... 10

Electrical Shielding ................................................................ 11

Troubleshooting .................................................................... 12

Mechanical Speciﬁcations .................................................... 13

Output Signals and Pin-Outs .............................................. 14

Electrical Speciﬁcations ........................................................ 15

Warranty ............................................................................... 16

SENC 50

Table of Contents

• Installationbracketsandkitsareavailable.

• YourAuthorizedDistributorcanassistyouinselectingbrackets

and tools for your installation.

Front mount bracket

Adjustablefrontorrear

mount

Bottom mount bracket

Base mount

Front mount

bracket

Spar

ACU-RITE

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TheSENC 50PrecisionGlass ScaleLinear Encoderprovidesthe

accuracy and reliability of an ACU-RITE

measuring system in a

verysmallcross-sectionwithdigitaloutput(analogoutputavailable).

Features and options include:

• Resolutionsof0.5,1.0or5µm.

• Accuracygradesof±3or±5µm/1000mm.

• PositionTracor50mmintervalReferenceMark.

• VinylorArmorcablesof5,13,&19ft.lengths.

• Mountingfasteners,centersupports,andbackupspar.

• Installationtools,brackets,andaccessories.

TheSENC50isespeciallyusefulforapplicationswithlimitedspace

such asX/Ystagesandcompactmetrologyequipment. Contact

yourAuthorizedDistributorforassistancewithselectionofproduct

options and accessories.

Forfutureorderinginformationorwarrantyservice,recordthelinear

encoder catalog and serial numbers.

Catalog # Serial # Manufacture Code #

Axis # 1: _____________________________________

Axis # 2: _____________________________________

Axis # 3: _____________________________________

Axis # 4: _____________________________________

Date of Purchase _____________________________________

Distributor: _____________________________________

Address: _____________________________________

Telephone: _____________________________________

A)SENC50linearencoder

B)ReferenceManual

C)EncoderandCableMounting

Hardware

Introduction / Supplied Items SENC 50

Shipping carton

contents

ACU-RITE

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Use this information to plan your Linear Encoder installation.

• Understandyourmountingrequirements.

• FollowkitinstructionswhenusinganACU-RITE

bracket kit.

• Mountencodersclosetowaystoinsuresystemaccuracy.

• Mountwithlipsealsdownandawayfromtheworkarea.

• Bracketsshouldbeshortandrigid.

• Surfaces must be in good condition, clean and free of

dirt and paint.

•

Donotremoveshippingbracketsuntilinstructed.

• Shippingbracketspacerscanbeusedtoinsure.059”gap.

• Mountfromeithersidetoobtaindesiredcableexitdirection.

• Tolerancesof.005”TIRapplytoallmountingdimensions.

• Centersupportsurfacerequiredforallmeasuringlengthswhen

not using a back up spar.

• Limitequipmenttraveltolessthanmeasuringlength.• Allowclearanceforshippingbracketremoval.

Shippingbracketremovalclearance

Totalheadtravel

SENC 50 Key Points / Tolerances

Reading head

assembly

Scale assembly

Gap

.059±.005”

[1.50]

-A-=Machinetravel

Center support surface

required

Equal

//.005A

// .005 B

//.005A

.26 [6.6]

Min.

Measuringlength+1”

[25.4]overtravel

.037[.9]

Min.

Slidebracketsaway

from the reading head

1.00

ACU-RITE

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Linear Encoder Dimensions SENC 50

Measuring length + 4.65 [118]

Measuringlength+4.09[103.9]

.280

[7.11]

Typ.

End cap

Scale assembly

Scale case

Mounting hole

.335

[8.51]

.140

[3.55]

.463

[11.76]

.175 [4.57]

Typ.

1.85

[47.00]

2.775

[70.50]

Reading

head

assembly

for M4

Hexnut

Strain relief

and cable

2.0[50]Approx.

min bend radius

of armor

Ø .160

[4.00] min.

Ø .30

[7.6]

Armor

Ø .16

[4.1]

Vinyl

.482

[12.25]

Alignboth

surfaces

1.182

[30.00]

.670

[17.00]

.Gap

.059±.005

[1.50]

.170

[4.32]

.02

[0.5]

1.352 [34.34]

.652

[16.56]

.170

[4.32]

Spar

.840

[21.34]

.295

[7.50]

M3x.25[6.31]

deep min.

.138

[3.50]

.159

[4.04] Typ.

.280

[7.11]

.150

[3.81]

2.350

[59.69]

.213

[5.41]

Typ.

ACU-RITE

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680803-13 13 17.650 3.825 3 5.000

680803-16 16 20.650 2.825 4 5.000

680803-18 18 22.650 1.325 3 10.000

 680803-15 15 19.650 2.325 4 5.000

680803-14 14 18.650 1.825 4 5.000

SENC 50 Spar Dimensions

 Backupspar LinearEncoder L A XNo. B

Part Number Measuring Length Places

680803-01 1 5.650 .825 2 4.000

 680803-09 9 13.650 1.825 3 5.000

680803-08 8 12.650 3.825 2 5.000

680803-07 7 11.650 3.325 2 5.000

680803-06 6 10.650 2.825 2 5.000

 680803-05 5 9.650 2.325 2 5.000

680803-04 4 8.650 1.825 2 5.000

680803-03 3 7.650 1.325 2 5.000

680803-02 2 6.650 .825 2 5.000

 Backupspar LinearEncoder L A XNo. B

Part Number Measuring Length Places

680803-12 12 16.650 3.325 3 5.000

680803-11 11 15.650 2.825 3 5.000

680803-10 10 14.650 2.325 3 5.000

Ø.196Drillthru

Ø.344C’borex.100Dp.

“X”no.ofplaces

±.015

BTyp.±.005

Nonaccumulative

“A”

±.005

.075

.330

.510

“A”

Ref.

Encoder retaining

clip

Sparleveling

screws

Backup spar

mounting

Spar

fastener

Backup spar mounting optional for all lengths

Clip mounting

screws

680803-20 20 24.650 2.325 3 10.000

ACU-RITE

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Mounting Requirements SENC 50

Mounting options can be adapted to machine mounting surfaces

usingspacers,standoffs,andlevelingscrews.

• Measuringlengthandmechanicalcongurationofyourequipment

determines your options.

• Lengthrelatedmountingoptionsshown.

• Whenabackupsparisused,mountthebackupsparfollowing

thesameprocedureasrequiredformountingwithoutabackup

spar,usingthesametolerances.

• 7”andsmaller:Endmountingholeswithencodermountedtoa

continuousatsurface,orwithcentersurfaceonsameplaneas

end mounting surfaces.

• 8”andlarger:Endmountingholeswithcentersupport.

End mounting holes

Center support

assembly

ACU-RITE

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Avarietyofmountingconditionscanbeaccommodated.

• Mechanicalcongurationoftheequipmentdeterminesbrackets

and adapters required to install the linear encoder.

• Threetypicalconditionsareshownforreference.

• Flushoroffsetmountingsurfacesusingaspar.

• Reading head mounting bracket required (bottom mounting

bracketexampleshown).

SENC 50 Typical mounting

• Mountingsurfacesareushwithin.005”.

• Installationwithoutabackupspar.

Spar mounting

Flush mounting surfaces

Offset mounting surfaces

• Offsetmountingsurfacesusingareadingheadbracket.

// .005

// .030

ACU-RITE

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Encoder Installation Procedure SENC 50

Thesestepsapplytoallmountingconditions.Althoughthismay

notpictoriallyrepresentyourapplication,yourinstallationprocedure

shouldfollowthesesteps.

•  ACU-RITE

Bracket Kit instructions supercede this

section.

• GeneralstepsforsmallX&Ystage.

• Adjustdrilldepthsandfastenerlengthsasrequired.

• ContactyourAuthorizedDistributorifassistanceisrequired.

• Centerthereadingheadonthescalecasebyslidingtheheadand

shipping brackets together along the scale case.

• Locatethelinearencoderalongtheaxispartingline.

• Marklocationofoneendmountingholeinthescalecase.

• Centertheaxis.

• Marktheaxisforeasyreturntocenter.

Keep head and scale

case

surfaces ﬂush

Shipping

brackets(2)

Reading head

Strain relief and

cable assembly

Scale case

Aligntopofscalecaseto

within.015”ofaxistravel

Underside of end caps to be

ushwithpartinglineof

upper slide.

Scale case

Mark end mounting hole

location

Markcenterofaxis

Centermountingaxis

End cap

ACU-RITE

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• Slideshippingbracketsfromreadingheadandtwisttoremove

from the scale case.

• SavetheshippingbracketswiththeReferenceManual.

• Drill/taptherstendmountinghole/Attachthescalecase.

• Aligntowithin.005”TIR.anddrill/tapsecondendhole.

• Attachscalecase&aligntowithin.005”TIR.oftheaxistravel.

• Centertheaxisandmarkthereadingheadmountingholes.

• Movetheaxisanddrill/tapholesfor6-32(M3).

• Attachheadandaligntoscalecasetowithin.005”TIR.

• Usecentersupportswhenprovided.

• Placeatuniformintervalsalongthescalecase.

SENC 50 Installation Procedure

6-32x3/4”SHCS&M3atwasher

(M3x20mm)

Center support

Retaining clip

Shipping bracket

(2)

Slide bracket from reading head

andtwist45°

Axis

travel

6-32x3/4”SHCS&M3

atwasher(M3x20mm)

Aligntowithin

.005”

toaxistravel

Drill / tap

for6-32(M3).

6-32x3/4”SHCS&M3at

washer(M3x20mm)

Use shipping brackets

tomaintain.059

gapbetween

head and

scale case.

Drill/tapfor6-32(M3).

ACU-RITE

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• Checkfunctionofthelinearencoder.

These steps will conrm proper operation of your installation.

CountingtestscheckchannelAandBoutputfunctionandReference

Mark tests check Reference Mark operation.

• Congurethereadoutforpropercountingresolution.

• Moveaxisandcomparethedisplaytothemovement.

• Repeattestformechanicalintegrityandrepeatability.

• Congurethereadoutforsensingreferencemark.

• Movethereadingheadapproximately20mm.

• Locate an indicator on scale end and zero out axis and

indicator.

• Moveaxisoutandbackoverfulltravelandreturntodialzero.

• Electronicsshouldreadzero±1count.

Checking the Installation SENC 50

• Zerothedisplayandindicator.

• Moveaxistotheendofit’stravel,thenreturntodialzero.

• Readoutshouldreadzero±1count.

Repeatability Test

Placeindicatoratendofmoving

component(scalecaseshown,or

readinghead).

• Routethecableswithslackloopstoallowforaxismotion.

• Secureexcesscablebyfasteningwithclipsorties.

• Attachthelinearencoderconnectorstothereadout.

Readout

Counting Test

Connecting

Secureexcess

cable

Provideslack

loops

Readout

ACU-RITE

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SENC 50 Electrical Shielding

Connectagroundwirefromtheterminalonthebackofthereadout

to the machine or earth ground. Attach a ground wire from the

machine to a solid earth ground.

With the encoder attached to the machine and the cable connected

tothereadout,checkshieldingbymeasuringresistancebetween

connectorhousingandscaleunit.Desiredvalue:1Ωmax.

ACU-RITE

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Trouble Shooting SENC 50

Ifyouexperiencedifcultieswithyourinstallation,therearemethods

toanalyzethe difculty.  Operating difculties can be caused by

either the linear encoders or the readout.

Checking the readout

Followthestepsbelowtodetermineifyourdifcultiesareassociated

withthereadout:

• Insurethatthelinearencoderconnectorsarecorrectlyseated.

• Swaplinearencodercablesatthereadouttoseeiftheproblem

isstillshowninthesamedisplay.

• If the problem remains in the same display, the readout is in

error.

• Iftheproblemfollowstheconnectionchange,thelinearencoder

may be in error.

• Followthisprocedureforanyintermittentproblemexperienced.

Ifthereadoutisatfault,referto“Whattodo”toarrangeforthe

parts necessary to repair your system. If the linear encoders appear

tobethecause,performthenextstep.

Checking the Linear Encoders

Linearencoderdifcultiescanbecausedbyimproperinstallation,

loose or misaligned bracketry, or a damaged / failed linear

encoder.

Follow the steps below to determine the cause of your system

difﬁculties:

• Conrmthatyourbrackets,andinstallationdoesnotinterfere

withothermachinestructuresthroughthelength ofthe linear

encodertravel.

• Checkforloosefasteners.Ifyoundloosefasteners,rstconrm

that the linear encoder is installed to the tolerances speciﬁed and

then retighten the fasteners as required.

• Confirm that the linear encoder is installed to the required

tolerances by checking the alignment tolerances speciﬁed on Page

3“KeyPoints”.Iftheinstallationdoesnotmeetthetolerances,

reinstall the linear encoder according to the procedures in

“Installation”.

• PerformaRepeatabilityTestasdescribedonPage10,“Checking

YourInstallation”.Ifthelinearencoderisinstalledtotherequired

tolerances,thebracketryandlinearencoderhavebeenchecked

forinterferencesandloosefasteners,andthelinearencoderfails

therepeatabilitytest,thelinearencoderislikelyatfault.

Do not attempt to repair the linear encoder. The units are only

serviceable by assembly replacement.  Attempted repair can

permanentlydamagetheunitandvoidthewarranty.

What to do

If an ACU-RITE

linearencoderorreadoutisfoundtobeatfault,

prior to removing the linear encoders or readout contact your

AuthorizedDistributororOEM/OEIforrepairinstructions.

ACU-RITE

516353-22_Ve00_SENC_50_Ref_Man_bak.indd 14 10/22/2009 11:58:07 AM

SENC 50 Mechanical Specications

Mechanical Specifications Digital Analog

 Resolution 0.5µm 1µm 5µm

Gratingpitch 20µm

Scalemedium Lighttransmissionreectiveoffofchromecoatedglass

Accuracy(@20°C)/1000mm ±3µm,±5µm

Max.slewspeed(M/s)   1

Connectingcable Length=5,13,and19ft. Length=5,13,and19ft.

 armoredorvinyl Connector:DE-9P Connector:DE-9P

Max.cablelength(ft) 20 26 75

Repeatability Within one resolution count

Referencepulseinterval 50mmxedorPositionTrac

Measuringlengths 1”-20”

Weight 1.1 + 0.2 lbs/ft of measuring length [64g + 5.6g/in.]

Forcerequiredtomove <0.5(lbs)

reading head

OperatingEnvironment

 Temperature 0°to50°C

 RelativeHumidity 20%to95%(non-condensing)

StorageEnvironment

 Temperature -20°to70°C

 Humidity 20%to95%(non-condensing)

Operatingcurrent(ma) 220 180 75

Protection(IEC529) IP53wheninstalledasperinstruction

ACU-RITE

516353-22_Ve00_SENC_50_Ref_Man_bak.indd 15 10/22/2009 11:58:08 AM

Digital Differential

AnalogDifferential

 Pin1 Pin2 Pin3 Pin4 Pin5 Pin6 Pin7 Pin8 Pin9

 Whitew/GrnStripe&Brown Green Yellow Orange Red N/C Black Blue Violet

 Ground Channel Channel Channel Channel N/C Vcc,+5.0 Channel Channel

  A+ A- B+ B-  ±0.1VDC R+ R-

 Pin1 Pin2 Pin3 Pin4 Pin5 Pin6 Pin7 Pin8 Pin9

 N/C Green Yellow Pink Red White Black Gray Brown

Output Signals and Pin-Outs SENC 50

 N/C Channel Channel Channel Channel Ground Vcc,+5.1 Channel Channel

  A+ A- B+ B-  ±0.1VDC R+ R-

ACU-RITE

516353-22_Ve00_SENC_50_Ref_Man_bak.indd 16 10/22/2009 11:58:08 AM

SENC 50 Electrical Specications

Output Signals

Incremental signals

Signallevels

Reference Mark signals

Signallevel

PowerSupply

Square-wavevoltagesignals.

ChannelsAandB,in90°

quadrature relationship

TTL-level

Similarphasing,butdifferential

sinusoidalcurrentor1voltpeaktopeakoutput

7-16µA

or1.0V

w/1KOhmload

Square-wavesignal

TTL-level

Differentialcurrentor1voltpeaktopeakoutput

2-8µA

or1.2V

w/100KOhmload

5.1±0.1VDC@220mAmax.

5.0±0.1VDC@75mAmax.

=(Highleveloutputcurrent)=20mA

=(Highleveloutputvoltage)>2.5Vdc

=(Lowleveloutputcurrent)=-20mA

=(Lowleveloutputvoltage)<0.6Vdc

90°

360°

1 Count

(Phased)

Channel R+

0°

ChannelA+

Channel B+

Channel B-

ChannelA-

Channel R-

Channel R

ChannelA

Channel B

0°

360°

A,B

:7-16µA

1.0V

:2-8µA

1.2V

90°

ACU-RITE

Parameter

Digital Analog

516353-22_Ve00_SENC_50_Ref_Man_bak.indd 17 10/22/2009 11:58:08 AM

Warranty SENC 50

ForWarrantyinformation,gotowww.acu-rite.com.

ACU-RITE

516353-22_Ve00_SENC_50_Ref_Man_bak.indd 18 10/22/2009 11:58:08 AM

516353-22_Ve00_SENC_50_Ref_Man_bak.indd 19 10/22/2009 11:58:08 AM

ACU-RITE

333 East State Parkway

Schaumburg, IL 60173-5337 USA

HEIDENHAIN CORPORATION

+1 (847) 490-1191

+1 (847) 490-3931

E-Mail: [email protected]

www.heidenhain.com

516353-22 Ver 00 • Subject to change without notice • 10/2009

516353-22_Ve00_SENC_50_Ref_Man_bak.indd 20 10/22/2009 11:58:08 AM

ACU-RITE SENC 50 Reference guide

ACU-RITE SENC 50 Reference guide

ACU-RITE SENC 50 Reference guide

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