HEIDENHAIN ACU-RITE SENC 125 T User manual

SENC 125 T/E
REFERENCE MANUAL
ACU-RITE
®
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Page
Introduction ............................................................................. 2
Mounting Preparation .............................................................. 3
Mounting Information .............................................................. 4
Encoder Dimensions - SENC 125 T (top mount) .................... 5
Encoder Dimensions - SENC 125 E (end mount) ................... 6
Encoder Center Support (for SENC 125 E only) ........................ 7
Mounting Requirements ......................................................... 8
Typical Mounting (s) ............................................................... 9
Page
Encoder Installation Procedure ............................................. 10
Checking the Installation ........................................................ 13
Electrical Shielding ............................................................... 14
Troubleshooting .................................................................... 15
Mechanical Specications .................................................... 16
Output Signals and Pin-Outs .............................................. 17
Electrical Specications ........................................................ 18
Warranty .............................................................................. 19
SENC 125 T/E Table of Contents
Brackets ...
• Installation brackets and kits are available.
• Your authorized distributor can assist you in selecting brackets
for your installation.
Leveling
Blocks
Reading head
mounting
brackets
6” Vertical side
bracket
4” Extension
bracket
8” Vertical side bracket
Available in right or left
(shown) hand
1
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2
Introduction / Supplied Items SENC 125 T/E
For future ordering information or warranty service, record the
linear encoder catalog number located on the scale assembly tag,
and the serial number from the reading head tag.
Catalog No. Serial No.
Axis # 1: _______________ __________________
Axis # 2: _______________ __________________
Axis # 3: _______________ __________________
Axis # 4: _______________ __________________
Date of purchase: ____________________________________
Distributor: ____________________________________
Address: ____________________________________
Telephone: ____________________________________
The SENC 125 T and E Precision Glass Scale Linear Encoders
provides the accuracy and reliability of an ACU-RITE
®measuring
system.
Features include:
• Resolutions of 5µm.
• Accuracy Grade of ± 10µm/1000mm.
• Reference signals on 50mm intervals.
• Braided cables: 42”< encoders - 13 ft. length.
42”> encoders - 19 ft. length.
• Two scale case forms:
-SENC 125 T: Top mount scale; 2” - 120” measuring length
-SENC 125 E: End mount scale; 2” - 60” measuring length
• Mounting fasteners provided with scale.
• Mounting brackets available.
A • SENC 125 T or E linear encoder
B • Reference Manual
C • Encoder and Cable mounting hardware
Shipping carton contents
A
C
B
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Please follow these preparation guide lines.
• Understand your mounting requirements.
• Mount with lip seals down and away from the work area.
• Brackets should be kept as short and rigid as possible.
• Surfaces must be in good condition, clean, and free of dirt.
Remove paint from machined surfaces used for mounting.
• Alignment brackets must not be removed until instructed.
• Machine travel can not exceed the encoder measuring length.
• Either limit machine travel or use correct length scale.
• Never mount with lip seals upward or towards work area.
3
SENC 125 T/E Mounting Preparation
“L” = Measuring length
+ 1.75” nominal
over travel
2.0
[50.8]
2.4
[61]
2.4
[61]
2.0
[50.8]
“L” = Measuring length
+ 1.75” nominal
over travel
SENC 125 T
SENC 125 E
Cable direction
• Determine the cable exit direction before installing the encoder.
• To change the cable exit direction; remove the cover plate and
rotate the cable 180°.
T-10 Torx screw (2)
Plug
Cover plate
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Mounting Information SENC 125 T/E
Use this information to plan your Linear Encoder
installation.
• Mount the linear encoders close to machine guide ways to
ensure system accuracy.
• If space between the reading head and the mounting surface
exceeds .18”, use a mounting bracket or spacer to reduce
space.
• ACU-RITE
® bracket kit instructions provide step by step
installation procedures.
• Tolerances of .010” TIR apply to all mounting dimensions.
• Top mounted form X= 2.37”.
• End mounted form X= 1.90”.
• Clearance requirements for alignment bracket removal.
• Alignment brackets must not be removed until instructed. • Use reading head leveling set screws.
• Reading head bracket required for a space >.18”.
Offset
mounting
Move bracket past
the cable strain relief
Alignment bracket removal clearance
1.0
[25mm]
1.38
[35mm]
Alignment
bracket
Alignment
bracket
(SENC 125 E end mounting scale case shown for reference) SENC 125 T SENC 125 E
.005 - .180”
Max. Gap
.005 - .180”
Max. Gap
Underside of end
caps to be ush
with the parting line
Axis parting
line
Axis parting
line
// .010 A
// .010 A
X
-A- = Axis travel
Tolerances ...
4
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SENC 125 T/E Encoder Dimensions
Measuring length + 5.75 [146]
1.72 [43.7]
Mounting holes
for 10-32 SHCS
SENC 125 T
(top mounted scale case)
.07 [1.7]
.95 [24.1]
.28 [7.1]
2.0
[50.8]
Ø For 8-32
(or M4) SHCS
mounting
screw
1.25 [32]
Min. bend rad.
2.37
[60.2]
.71
[18]
.57 [14.5]
1.12 [28.6]
.56 [14.2]
.12 [3]
.37 [9.4]
2.0 [50.8]
.31 [7.9]
15.75
[400] Typ.
2.25
[57.1]
15.75
[400] Typ.
5
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SENC 125 E
(end mounted scale case)
.07 [1.7]
Measuring length + 6.55 [166.4]
Measuring length + 5.44 [138.1]
.56
[14.2]
.94 [24]
.37 [9.4]
Mounting hole Ø .453 C’bore Ø .313 Thru
2.25
[57.1]
.56 [14.2]
Ø For 8-32
(or M4) SHCS
mounting
screw
1.25 [32]
Min. bend rad.
.59 [14.9]
1.90
[48.3]
Mounting hole
.95
[24.1]
.57 [14.5]
.71 [18]
.12
[3] .31 [7.9]
1.12
[28.6]
.70
[17.8]
2.65
[67.3]
Encoder Dimensions SENC 125 T/E
Center Support
.96
[24.4]
.75
[19.0]
6
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SENC 125 T/E Encoder Center Support
S ENC 125 E > 24” MUST USE CENTER SUPPORT(S) OR SPAR
Center Linear Encoder Distance
Support (s) Measuring Length Apart
Center Linear Encoder Distance
Support Measuring Length Apart
1 34 19.72
1 32 18.72
1 30 17.72
1 28 16.72
1 26 15.72
1 24 14.72
1 36 20.72 2 60 21.81
2 52 19.14
2 48 17.81
2 42 15.81
1 40 22.72
1 38 21.72
2 54 19.81
26.0”
[660 mm]
Max.
26.0”
[660 mm]
Max.
26.0”
[660 mm]
Max.
7
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Mounting options can be adapted to machine mounting surfaces
using spacers, standoffs, leveling set screws. A spar can be used
for the SENC 125 E encoder.
• Measuring length and mechanical conguration of your
machine determine your options.
• Fastener lengths described on this page are included with the
encoder or the backup spar.
• Mounting can be direct to the machine surface or with the aid of
leveling blocks or spacers. • For use with SENC 125 E scale case only (see page 7).
Mounting Requirements SENC 125 T/E
SENC 125 T
1/4-20 x 1/2” BHCS
& M6 Flat washer
Backup spar or center support mounting for SENC 125 E
encoders only
• Mounting can be direct to the machine surface or with the aid of
leveling blocks, spacers or back up spar.
M4 x 8mm SHSS
SENC 125 E
M5 Flat washer
10-32 x 1-1/4” SHCS
M3 x 8mm SHSS (3) 8-32 x 1” SHCS (2)
1/4-20 x 1/2” BHCS (2)
8-32 x 1” SHCS (2)
M3 x 8mm SHSS (3)
M6 Flat washer x .017” thk. (2)
Mounting hole cover (2)
Center Support
1/4-20 x 3/4” BHCS
1/4 Flat
washer
8
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A variety of mounting conditions can be accommodated.
• The machine conguration determines the brackets and
encoder style required for installation.
• Typical mounting conditions are shown; ush with reading head
bracket, and SENC 125 E encoder with backup spar.
• The 8-32 SHCS for mounting the reading head is a standard
low head style fastener.
• Flush mounting surfaces, reading head bracket required.
• Bracket used to reduce head to mounting surface offset.
• Use reading head leveling screws for alignment.
• Offset mounting surfaces with a backup spar.
• Bracket used to reduce head to mounting surface gap.
• Use reading head leveling set screws for alignment.
SENC 125 T/E Typical Mounting (s)
Backup spar & bracket
Flush mounting surfaces SENC 125 E
Reading head bracket required
8-32 x 5/8” SHCS
(trim if necessary)
8-32 x 5/8” SHCS
(trim if necessary)
Mounting
surfaces ush
Reading head bracket required
• Flush mounting surfaces, reading head bracket required.
• Bracket used to reduce head to mounting surface offset.
• Use reading head leveling screws for alignment.
Flush mounting surfaces SENC 125 T
8-32 x 5/8” SHCS
(trim if necessary)
Mounting
surfaces ush
Reading head bracket required
Mounting
surfaces offset
9
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These steps apply to typical encoder mounting conditions and
assumes the mounting surface is parallel to the machine travel to
within .010”.
• ACU-RITE
®bracket kit instructions supercede this section.
• Adjust drill depths and fastener lengths as required.
• Contact your authorized Distributor should you require
additional assistance.
• Move the reading head to the center of the scale case by sliding
the reading head and brackets along the case.
• Move the machine axis to its center of travel and mark the axis
for future reference.
• Locate the encoder so that a suitable mounting position
is provided for both the scale case and the reading head.
Keep the underside of end caps approximately ush with the
underside of the table (or axis parting line).
• Mark the location of one end mounting hole to the mounting
surface and remove encoder.
Encoder Installation Procedure SENC 125 T/E
Scale case
Reading head assembly
Alignment brackets (2)
C
L
Center mounting axis Align top of scale case to
within .015” of -A-
Cable assembly
Scale case
Axis parting line End mounting hole (typical)
• Drill & tap the rst end mounting hole location.
• Attach the encoder and align to within .010” TIR. to -A-.
• Transfer punch the remaining mounting holes and remove the
encoder.
10-32 x 1-1/4” SHCS & M5 at washer
Align to within .010” TIR to -A-
-A- Drill / tap
for 10-32
-A- = Axis travel
-A- = Axis travel
10
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SENC 125 T/E Encoder Installation Procedure
• Return the table to the center of travel. Move the reading head
to the center of the scale case.
•Transfer punch the two reading head mounting holes. If using
a reading head bracket, use the next step.
• Slide the reading head to one side, and drill and tap the hole
locations for an 8-32 x 1/2” deep.
• Attach the bracket to the reading head with the 8-32 x 5/8”
BHCS.
•Transfer punch the two reading head bracket mounting holes
to the machine.
• Remove the bracket, drill and tap the hole locations for an
1/4-20 x 1/2” deep. Attach the bracket to the machine with (2)
1/4-20 x .5” BHCS and washers.
10-32 x 1-1/4” SHCS & M5 at washer
Align to within .010” TIR to -A-
-A-
• Drill / tap the remaining mounting holes.
• Attach the encoder and align the face and the top of the scale
case to within .010” TIR. to -A- (refer to page 4, “Tolerances”).
• Secure the encoder in place maintaining this alignment.
C
L
Reading head mounting holes
Reading head bracket
8-32 x 5/8” SHCS
(M4 x 20mm)
• Insert, but do not tighten 8-32 (M4) reading head screws.
• A gap will exist between the reading head and the bracket.
Gap
Do not tighten prior to adjusting leveling set screws
-A- = Axis travel
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• Place a .001”-.003” shim between the leveling set screws and
mounting surface.
• Adjust each set screw until a slight drag is felt on the shim.
• Evenly tighten the 8-32 (M4) reading head mounting screws.
Encoder Installation Procedure SENC 125 T/E
Leveling screw (3)
• Slide the brackets away from the reading head.
• Remove the alignment brackets and save for future use.
Alignment bracket
removal
Twist 45°
Slide brackets away from reading head and cable.
• 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.
Connecting
Secure excess
cable
Provide slack
loops
Attach connector
12
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SENC 125 T/E Checking the Installation
• Zero the display and indicator.
• Move axis to the end of it’s travel return to dial zero.
• Readout should read zero ± 1 count.
Place dial indicator at the end of the moving
component (scale assembly or reading head).
Repeatability Test
• Move the axis and compare the display to the movement.
Readout
Counting Test
Counting Test:
• Congure the readout’s encoder and display resolution (see
manual).
• Move the axis and compare the display to the movement.
Repeatability Test:
• Locate an indicator on one end of the encoder and zero the
readout and indicator.
• Move the axis through the full travel and return to dial zero.
• Readout should read zero ± 1 count.
These steps will conrm proper operation of your installation.
The counting Test conrms proper electrical operation. The
Repeatability Test checks the installation integrity.
13
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Electrical Shielding SENC 125 T/E
SENC 125 E
shown
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 max.
14
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SENC 125 T/E Trouble Shooting
If you experience difculties with your installation, do the following
to determine the problem.
Checking the Readout
Difculties on more than one axis are usually associated with the
readout. Follow these steps 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.
If the Readout is at fault, refer to “What to do” to arrange for
the parts necessary to repair your system. If a linear encoder
appears to be at fault, proceed with “Checking the Linear
Encoders”.
Checking the Linear Encoders
Problems on a single axis are usually associated with the linear
encoder or its installation. Difculties can be caused by improper
installation, loose or misaligned bracketry, or a damaged or
inoperable encoder.
Follow these steps to determine the cause of your system
difculties:
• Conrm that your bracketry and installation does not interfere
with other machine structures through the entire 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
specied and then retighten the fasteners as required.
• Conrm that the linear encoder is installed to the required
tolerances by checking the alignment tolerances specied
on Page 4. If the installation does not meet the tolerances,
reinstall the encoder according to the “Installation Procedure”.
• Perform a Repeatability Test as described on Page 13. If
the linear encoder is installed to the required tolerances, the
bracketry and encoder have been checked for interferences
and loose fasteners, and the encoder fails the repeatability test,
the encoder is likely at fault.
Do not attempt to repair the reading head or scale assembly. The
SENC 125 is eld serviceable by assembly replacement only.
Attempts to repair the encoder can permanently damage it and
void the warranty.
What to do
If an ACU-RITE
® linear encoder or readout is found to be at fault,
please contact your authorized Distributor for instructions prior to
removing the encoders or readout .
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Mechanical Specications SENC 125 T/E
Connecting Length = 13 ft (4m) cable for ML <42”
Braided cable Length = 19 ft (6m) cable for ML >42”
Connector: DE-9P
Mechanical Specications Digital
Resolution 5µm
Grating pitch 20 µm
Scale medium Reectance from nickel-coated glass
Accuracy (@ 20° C) ± 10µm/1000mm
Max. cable length 35 ft
Measuring lengths - SENC 125 T 2” - 120”
Force required to move < 0.75 lbs
reading head
Max. slew speed 30 inches/sec
Operating Environment:
Temperature 0° to 40° C
Relative Humidity 25% to 95% (non-condensing)
Storage Environment:
Temperature -20° to 65° C
Humidity 20% to 95% (non-condensing)
Weight w/cable SENC 125 T 1.3 lbs. + 0.11 lbs/in of measuring length
Weight w/cable SENC 125 E 1.3 lbs. + 0.05 lbs/in of measuring length
Reference Pulse Interval 50mm Fixed
Measuring lengths - SENC 125 E 2” - 60”
Protection (IEC 529) IP 53 when installed as per instructions
Repeatability Within one resolution count
16
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SENC 125 T/E Output Signals and Pin-Outs
Digital
1
69
5
Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9
- Green - Blue - White Brown Pink -
Channel Channel Ground Vcc, + 5.1 Channel
A+ B+ ± 0.1 VDC R+
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1 Count
90°
360°0°
Channel R+ 1
0
Channel A+ 1
0
Channel B+ 1
0
Electrical Specications SENC 125 T/E
Parameter Digital
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
Square-wave pulse
TTL-level
5.1 ± 0.1 VDC @ 180 mA max.
IOH=(High level output current) = 20mA
VOH=(High level output voltage) >2.5Vdc
IOL=(Low level output current) = 20mA
VOL=(Low level output voltage) < 0.6 Vdc
18
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