ACU-RITE ENC 150 User manual
ENC 150
ACU-RITE ®
REFERENCE MANUAL
Page
Introduction .............................................................................. 2
Mounting Preparation............................................................... 3
Mounting Information ............................................................... 4
Encoder Dimensions ................................................................ 5
Backup Spar Dimensions ........................................................ 6
Mounting Requirements ........................................................... 7
Typical Mountings .................................................................... 8
Installation Procedure .............................................................. 9
Page
Checking the Installation.......................................................... 11
Troubleshooting ..................................................................... 12
Mechanical Specifications ..................................................... 13
Output Signals and Pin-Outs ................................................. 14
Electrical Specifications ......................................................... 15
The ACU-RITE warranty and
30-Day Red Carpet warranty service ..................................... 16
Installation brackets and tools are available.
Your Authorized ACU-RITE Distributor can assist you in selecting
brackets and tools for your installation.
1ACU-RITE ®
Motor mount
Reading Head
bracket
Horizontal mt.
bracket
Extension
bracket
Side mount
bracket
Rear mount
bracket
ENC150 Table of Contents
The ENC 150 precision glass scale linear encoder provides the
accuracy and reliability of an ACU-RITE measuring system with
digital output (analog output available). Features and options
include:
Digital resolutions of 1, 2, 5, or 10 µm.
Accuracy grades of ±3, and ± 5 µm / 1000mm.
Home reference signal (Ref. Mark) coded or 200mm interval.
Vinyl or Armor cables of 5, 10, and 15 ft. length.
Mounting fasteners, center supports, and backup spars.
Installation brackets and accessories.
Contact your Authorized ACU-RITE Distributor for assistance with
selection of product options and accessories.
A) ENC 150 Linear Encoder
B) Backup Spar
C) Linear Encoder Reference Manual
D) Cable Mounting Hardware
E) Linear Encoder Mounting Hardware
F) Backup Spar Mounting Hardware
ACU-RITE ® 2
Introduction ENC 150
C
A
Shipping carton
contents
D
E
ENC 150
2 thru 60
B
C
A
E
D
F
Shipping carton
contents
ENC 150
65 and over
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: _______________
Please follow these preparation guide lines.
Understand your mounting requirements.
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 alignment brackets until instructed.
Limit equipment travel to encoder measuring length or less.
Determine cable exit before installing
To change cable exit direction; remove base and rotate 180°.
Never mount with lip seals upward or towards work area.
3ACU-RITE ®
ENC150 Mounting Preparation
L = Measuring length
+ 1.75 nominal
over travel
L
1.150
1.150
Cable direction
Rotate reading head
base 180°
Use this information to plan your Linear Encoder installation.
Mount the linear encoders close to machine guide ways to ensure
system accuracy.
Follow kit instructions when using an ACU-RITE bracket kit.
Mounting surfaces offset greater than .18 between the reading
head and mounting surface require a spacer or bracket.
One side of the linear encoder addresses flush mounting surfaces,
and the opposite side addresses offset mounting surfaces.
Tolerances of .005 TIR apply to all mounting dimensions.
Center support mounting surface required for 24 through 60
linear encoder measuring lengths.
Allow clearance for alignment bracket removal.
Do not remove alignment brackets until instructed.
Use reading head leveling set screws when surfaces are not flush.
Offset mounting surfaces require a spacer or reading head bracket
if gap is over .188.
ACU-RITE ® 4
Mounting Information ENC150
Scale case
Flush
mounting
Offset
mounting
Backup spar mounting
and reading head bracket
-A- = Machine Travel
Reading head
B
Equal Equal
1.826 ±.010 [46.5]
// .005 A
// .005 A
// .005 B
// .005 A
// .005 A
0.0 ± .010
Move bracket past
the cable strain relief
Alignment bracket removal clearance
1.0
[25]
1.38
[35]
Alignment
bracket
Alignment
bracket
5ACU-RITE ®
ENC150 Encoder M
Measuring length + 6.375 [161.9]
Measuring length + 5.437 [138.1]
.469
[11.9]
.944
[24.0]
.320
[8.1]
Æ .500 CBore
Æ .313 Thru
Reading Head
assembly 2.250
[57.1]
1.125
[28.6]
.56
[14.4]
.100
[2.5]
Æ For 8-32
(or M4) SHCS
mounting
screw
.32
[8.4]
Armor
.20
[5.2]
Vinyl
1.25 [32]
Min. bend rad.
Max. nominal linear encoder over travel 1.825
Published over travel 1.75
.810
[20.6]
.285
[7.2]
1.826
[46.4]
1.12
[28.5]
End Cap
Mounting hole
Scale case .562
[14.3]
.570
[14.5]
.810
[20.5] 1.060
[27.0]
2.148
Ref.
[54.6]
.250
[3.4] .660
[16.8]
1.440
[36.6]
.750
[19.0]
.121
[3.11]
With Backup
Spar
ACU-RITE ® 6
Backup Spar Dimensions ENC 150
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A ± .015
A ± .005
L ± .015
5.000 typ. ± .015
Non
Accumulative
B typ. ± .015
Non Accumulative
A Ref.
.750 ± .005
.110 ± .005
M4 Thru
Æ.312 Thru
Æ.500 CBore x .160 Dp.
X No. of holes
E
Mounting options can be adapted to machine mounting surfaces
using spacers, standoffs, or leveling set screws.
Measuring length and mechanical configuration of your equipment
determine your options.
Backup spar mounting is an option but not required for lengths
up to 60.
Backup spar uses the same mounting procedure as is used with
mounting the scale case. Follow these steps for alignment and
hole location.
Less than 24 : Use end mounting holes. Over 60 :A backup spar is required.
7ACU-RITE ®
ENC150 Mounting Requirements
1/4-20 x 1 BHCS
& scale washer
End hole mounting
1/4-20 x 1/2 BHCS
and spar washer
Backup spar
mounting
24 to 60 : Use end mounting holes with center supports.
.75 [19]
1/4-20 x 1 BHCS
Typical
8-32 x 1
SHCS Linear
Encoder
washer
Center
support
End hole mounting
with center support
M4 x 8mm
SHSS
A variety of mounting conditions can be accommodated.
Mechanical configuration of the equipment determines brackets
and adapters required to install the linear encoder.
Three typical conditions are shown; flush, offset, and backup spar
mounting.
Mounting surfaces offset.
Installation without backup spar.
Use leveling set screws to eliminate spacers and shims.
Mounting surfaces flush within .005.
Reading head leveling set screws typically not required.
Flush or offset mounting surfaces with a backup spar.
Reading head bracket to reduce head mounting surface gap.
Use reading head leveling set screws.
ACU-RITE ® 8
Typical Mountings ENC 150
1/4-20 x 1/2 BHCS
and spar washer
8-32 x 5/8 SHCS
(trim to fit)
1/4-20 x 1/2 BHCS
Backup spar mounting
on offset surface
A space over .188, requires the use of a spacer or reading
head bracket (shown) and leveling set screws.
1/4-20 x 1 BHCS
with encoder washer
8-32 x 1 SHCS
Offset mounting surface
Space of .188 or less use reading
head leveling set screws.
1/4-20 x 1 BHCS
and encoder washer
8-32 x 3/4 SHCS
Flush mounting surface
.005
0.0 ± .005
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.
Adjust drill depths and fastener lengths as required.
When instructed: Use this procedure for adjusting the leveling
set screws:
1. Insert, but do not tighten 8-32 (M4) reading head screws.
2.Place a .001-.003 shim between leveling set screw and
mounting surface.
3. Adjust each set screw until a slight drag is felt on the shim.
4. Evenly tighten 8-32 (M4) reading head mounting screws.
Contact your Authorized ACU-RITE Distributor if assistance is
required.
Align the center marks on the reading head and scale assembly
by sliding the reading head and brackets along the case.
Locate the scale case flush with the axis parting line.
Mark one end mounting hole.
Move the axis to its center of travel.
Mark the axis for easy return to center.
9ACU-RITE ®
ENC150 Installation Procedure
Scale assembly
Reading head assembly
Alignment
brackets (2)
C
L
Center mounting
axis
Mark center
of axis
C
L
Position encoder so
underside of endcaps
are flush with axis
parting line.
Align top of scale case to
within .015 of -A-
-A- = Axis travel
Mark one end mounting
hole location
Cable assembly
Endcap Scale assembly
Use allen wrench to slide brackets away from the reading head.
Remove alignment brackets and save for future use.
Drill / tap the first end mounting hole / Attach the linear encoder.
Align to within .005 TIR. to -A-, drill / tap second end hole.
Attach the linear encoder / Align to within .005 TIR. to -A-.
Center the axis and mark the reading head mounting holes.
Move axis, drill / tap holes for 8-32 (M4).
Attach head to axis / set leveling screws / secure fasteners.
Use the center support(s) when provided.
Place at equal intervals along the linear encoders length.
Center support
Alignment bracket
removal
Slide brackets away from reading
head and cable.
twist 45°
-A- = Axis travel
1/4-20 x 1 BHCS & Scale flat washer
(M6 x 25mm)
Align to within .005 TIR
to -A-
Drill / tap
for 1/4-20 (M6).
8-32 x 3/4 SHCS
(M4 x 20mm)
Do not tighten prior to adjusting
leveling set screws.
Drill / tap for 8-32 (M4).
ACU-RITE ® 10
Installation Procedure ENC 150
8-32 x 1 SHCS
(M4 x 25mm)
Route cable with slack loops allowing for axis motion.
Secure excess cable by fastening with clips or ties.
Attach the linear encoder connector to the readout.
Move the axis and compare counts versus displacement.
Move the axis 20mm (.79) to check reference mark operation.
These steps will confirm proper operation of your installation. The
Counting Test checks channel A and B output function and
Reference Mark operation. The Repeatability Test checks the
installation integrity.
Counting Test:
Configure the readouts encoder and display resolution.
Move the axis and monitor counts versus displacement.
Configure readout for sensing reference mark occurrence.
Move the axis a minimum of 20mm (axis display should zero).
Repeatability Test:
Locate an indicator on one end and zero out axis and indicator.
Move the axis through the full travel and return to dial zero.
Readout should read zero ± 1 count.
Move axis to end of travel.
Return to dial zero.
Readout should read zero ± 1 count.
11 ACU-RITE ®
ENC150 Checking the Installation
Place dial indicator at the end of the moving
component (scale assembly or reading head).
Repeatability Test
Readout
Counting Test
If you experience difficulties with your installation, there are methods
to analyze the problem. Operating difficulties can be caused by
either a linear encoder or a readout. Problems on a single axis are
usually associated with the linear encoder or its installation.
Difficulties on more than one axis are usually associated with the
readout.
Checking the Readout
Follow the steps below to determine if your difficulties 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
Difficulties can be caused by improper installation, loose or
misaligned bracketry, or a damaged or inoperable encoder.
Follow the steps below to determine the cause of your system
difficulties:
Confirm 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 find loose fasteners, first confirm
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 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 11. 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
ENC 150 is field serviceable by assembly replacement only.
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 encoders or readout contact your Authorized
ACU-RITE Distributor or OEM/OEI for repair instructions.
ACU-RITE ® 12
Trouble Shooting ENC 150
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13 ACU-RITE ®
ENC150 Mechanical Specifications
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0DUN
Digital Differential
Digital single ended
ACU-RITE ® 14
Analog Differential
1
69
5
A
B
Large key
Output Signals and Pin-Outs ENC 150
Channel R
Channel A
Channel B
0° 360° IA, B:7-16 µApp
IR:2-8 µApp
135° ± 20°
360° ± 60°
Parameter Analog
1 Count
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
Similar phasing, but differential
sinusoidal current output
7-16µApp
w/1 K Ohm load
Square-wave pulse
TTL-level
Differential current output
2-8µApp
w/100 K Ohm load
IµA
IµA
5.1 ± 0.1 VDC @ 140 mA max. 5.1 ± 0.1 VDC @ 80 mA max.
90°
15 ACU-RITE ®
ENC150 Electrical Specifications
IOH=(High level output current) = 20mA
VOH=(High level output voltage) >2.5Vdc
IOL=(Low level output current) = 20mA
VOL=(Low level output voltage) < 0.5Vdc
90°
360°
0°
Channel R+1
0
Channel A+ 1
0
Channel A- 1
0
Channel B+ 1
0
Channel B- 1
0
Channel R- 1
0
ACU-RITE Products and accessories are warranted against defects
in material and workmanship for a period of three years from the
date of purchase. ACU-RITE will, at its option and expense, repair
or replace any part of the ACU-RITE product which fails to meet
this warranty. This warranty covers both materials and factory labor.
In addition, authorized ACU-RITE service representatives will
provide service labor (field service) for a period of one-year at no
charge. Notice of the claimed defect must be received by ACU-RITE
within the warranty period.
This warranty applies only to products and accessories installed
and operated in accordance with this reference manual. ACU-RITE
shall have no obligation, with respect to any defect or other condition
caused in whole or part by the customer's incorrect use, improper
maintenance, modification of the equipment, or by the repair or
maintenance of the product by any person except those deemed
qualified by ACU-RITE.
Responsibility for loss of operation or diminished performance due
to environmental conditions such as humidity, dust, corrosive
chemicals, deposition of oil or other foreign matter, spillage, or other
conditions beyond ACU-RITE 's control cannot be accepted by
ACU-RITE.
The foregoing warranty obligations are in lieu of all expressed or
implied warranties. ACU-RITE INCORPORATED shall not be liable
under any circumstances for consequential damages.
30 Day Red Carpet warranty service
All ACU-RITE products are covered by a 30-day Red Carpet
Warranty Service. If in the first 30 days this product fails for any
reason, repack it in the original packing materials and contact your
Authorized ACU-RITE Distributor for return procedures.
ACU-RITE ® 16
ACU-RITE ®Warranty ENC 150
ACU-RITE ®IS AN
ISO 9001
CERTIFIED
MANUFACTURER
ACU-RITE ®Encoder Systems
are manufactured in the USA
®
ACU-RITE
ONE PRECISION WAY
MASON INDUSTRIAL PARK
JAMESTOWN, NEW YORK 14701
101000-170 EDITION A 4/97 PRINTED IN USA
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