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  3. SENC 50

ACU-RITE SENC 50 Reference guide

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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.
1
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
2
Shipping carton
contents
A
C
B
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.
3
Shippingbracketremovalclearance
Totalheadtravel
SENC 50 Key Points / Tolerances
Reading head
assembly
Scale assembly
Gap
.059±.005”
[1.50]
B
-A-=Machinetravel
Center support surface
required
Equal
Equal
//.005A
//.005A
//.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
1.00
ACU-RITE
®
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4
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
5
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
L
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.
• Measuringlengthandmechanicalcongurationofyourequipment
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.
6
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.
7
Spar mounting
Flush mounting surfaces
Offset mounting surfaces
• Offsetmountingsurfacesusingareadingheadbracket.
// .005
// .030
// .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.
8
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
C
L
End cap
C
L
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.
9
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).
C
L
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.
10
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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11
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
®
516353-22_Ve00_SENC_50_Ref_Man_bak.indd 13 10/22/2009 11:58:07 AM
12
Trouble Shooting SENC 50
Ifyouexperiencedifcultieswith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
®
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13
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
®
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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
14
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-
1
9
6
5
ACU-RITE
®
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15
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
pp
or1.0V
pp
w/1KOhmload
Square-wavesignal
TTL-level
Differentialcurrentor1voltpeaktopeakoutput
2-8µA
pp
or1.2V
pp
w/100KOhmload
5.1±0.1VDC@220mAmax.
5.0±0.1VDC@75mAmax.
I
OH
=(Highleveloutputcurrent)=20mA
V
OH
=(Highleveloutputvoltage)>2.5Vdc
I
OL
=(Lowleveloutputcurrent)=-20mA
V
OL
=(Lowleveloutputvoltage)<0.6Vdc
90°
360°
1 Count
(Phased)
Channel R+
1
0
0°
ChannelA+
1
0
1
0
Channel B+
1
0
1
0
Channel B-
ChannelA-
Channel R-
1
0
Channel R
ChannelA
Channel B
0°
360°
I
A,B
:7-16µA
pp
or
1.0V
pp
I
R
:2-8µA
pp
or
1.2V
pp
90°
ACU-RITE
®
Parameter
Digital Analog
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16
Warranty SENC 50
ForWarrantyinformation,gotowww.acu-rite.com.
ACU-RITE
®
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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
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/