ENC 150™
REFERENCE MANUAL
®
ACU-RITE
ENC150 Table of Contents
Page
Introduction .......................................................................... 2
Mounting Preparation .......................................................... 3
Mounting Information ......................................................... 4
Encoder Dimensions ............................................................ 5
Backup Spar Dimensions ..................................................... 6
Mounting Requirements ...................................................... 7
Typical Mounting (s) ............................................................ 8
Encoder Installation Procedure ........................................... 9
Page
Spar Installation Procedure ................................................. 11
Checking your Installation ................................................... 13
Electrical Shielding ............................................................. 14
Troubleshooting .................................................................. 15
Mechanical Specifications .................................................. 16
Output Signals and Pin-Outs ............................................. 17
Electrical Specifications ..................................................... 18
The ACU-RITE Warranty ................................................... 19
Brackets ...
Reading Head
Quill
mounting
Off set
mounting
Motor mounting
Combination
reading head
w/extension
Side mounting
• Installation brackets and kits are available.
• Your Authorized ACU-RITE Distributor can assist you with the
proper selection of these for your installation.
1 ACU-RITE
®
Introduction / Supplied Items ENC 150
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:
• Resolutions of .5, 1, 2, 5, or 10 µm.
• Accuracy grades of ± 3, and ± 5 µm / 1000 mm.
• Vinyl or Armor cables of 2, 5, 10, 15 and 20 ft. length.
• Fasteners, center supports, and backup spars.
• Brackets and accessories.
Contact your Authorized ACU-RITE Distributor for assistance
with the selection of product options and accessories.
Contents
< 60”
A
D
E
C
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: ____________________________________
Contents
> 65”
A
C
F
E
D
B
A) ENC 150 Linear Encoder
B) Backup Spar
C) Reference Manual
ACU-RITE
®
D) Cable Mounting Hardware
E) Linear Encoder Mounting Hardware
F) Backup Spar Mounting Hardware
2
ENC150 Mounting Preparation
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 as possible and rigid.
• Surfaces must be in good condition, clean, and free of dirt. Remove
paint from machined mounting surfaces.
• Alignment brackets must not be removed until
instructed.
1.150
“L”
“L” = Measuring length + 1.75” nominal over travel
1.150
• Machine travel can not exceed the encoder measuring length.
• Either limit machine travel or obtain correct length scale.
• Never mount with lip seals upward or towards work area.
Cable direction
Vinyl cable grommet
Plug
Cover plate
T-10 Torx screw (2)
Armor cable hex crimp
• Determine the cable exit direction before installing the encoder.
• To change the cable exit direction; remove the cover plate and
rotate the cable 180°.
3 ACU-RITE
®
Mounting Information ENC150
Use this information to plan your Linear Encoder installation.
• Mount the linear encoders close to machine guide ways to ensure
system accuracy.
• One side of the linear encoder addresses flush mounting surfaces,
and the opposite side addresses offset mounting surfaces.
• If space between the reading head and the mounting surface
exceeds .18”, use a spacer or mounting bracket to reduce space.
• ACU-RITE bracket kit instructions provide step by step installation
procedures.
Alignment bracket removal clearance
Alignment
bracket
1.0
[25mm]
1.38
[35mm]
Alignment
bracket
Move bracket past
the cable strain relief
1.876 .010 [47.6]
.010 A
//
Scale case
Equal Equal
-A- = Machine Travel
Reading head
.010 A
//
//
0.0 ± .010
.010 A
//
// .010 A
.010 B
B
• Tolerances of .010” TIR apply to all mounting dimensions.
• Center support mounting surface required for 24” through 60”
linear encoder measuring lengths mounted without a spar.
Flush
mounting
Offset
mounting
Backup spar
mounting
• Allow clearance for alignment bracket removal.
• Alignment brackets must not be removed until
instructed.
ACU-RITE
®
• Use reading head leveling set screws when surfaces are not flush.
• Reading head bracket required for a space >.18”.
4
ENC150 Encoder Dimensions
.944 [24.0]
.370 [9.4]
.121 [3.11]
∅ For 8-32
(or M4) SHCS
mounting
screw
.56 [14.4]
Measuring length + 6.375
Measuring length + 5.437.469 [11.9]
Mounting hole
Scale case
∅ .500 C’bore
∅ .313 Thru
1.125
[28.6]
2.250
[57.1]
Reading Head assembly
Over travel 1.75
.32
[8.4]
Armor
.20
[5.2]
Vinyl
End Cap
1.25 [32]
Min. bend rad.
.810 [20.6]
.750 [19.0]
1.876
[47.6]
.810 [20.5]
1.060 [27.0]
2.198 Ref.
[55.8]
.700 [17.8]
.285 [7.2]
.562 [14.3]
1.12
[28.5]
.937 [23.8]
.570 [14.5]
.750 [19.0]
1.440
[36.6]
.710 [18]
.048 [1.2]
.250 [3.4] Spar
5 ACU-RITE
®
Backup Spar Dimensions ENC 150
Backup spar Linear Encoder L A X No. B
Part Number Measuring Length Places
385102-000 2 8.312 1.656 2 5.000
385104-000 4 10.312 2.656 2 5.000
385106-000 6 12.312 1.156 2 10.000
385107-000 7 13.312 1.656 2 10.000
385108-000 8 14.312 2.156 2 10.000
385110-000 10 16.312 3.156 2 10.000
385112-000 12 18.312 4.156 2 10.000
385113-000 13 (Special) 19.312 1.44 2 16.43
385114-000 14 20.312 5.156 2 10.000
385116-000 16 22.312 1.156 3 10.000
385118-000 18 24.312 2.156 3 10.000
385120-000 20 26.312 3.156 3 10.000
385122-000 22 28.312 4.156 3 10.000
385124-000 24 30.312 5.156 3 10.000
385126-000 26 32.312 1.156 4 10.000
385128-000 28 34.312 2.156 4 10.000
385130-000 30 36.312 3.156 4 10.000
385131-000 31.5 38.030 4.015 4 10.000
------
“L” ± .015
“A” ± .015
5.000 typ. ± .015
Non
Accumulative
“B” typ. ± .015
Non Accumulative
“A” ± .005
“E”
Backup spar Linear Encoder L A X No. B
Part Number Measuring Length Places
385132-000 32 (“E” 34.812) 35.687 .437 4 11.604
385135-000 35 (“E” 40.437) 41.312 .437 5 10.109
385136-000 36 42.312 1.156 5 10.000
385140-000 40 46.312 3.156 5 10.000
385142-000 42 48.312 4.156 5 10.000
385148-000 48 54.312 2.156 6 10.000
385152-000 52 58.312 4.156 6 10.000
385154-000 54 60.312 5.156 6 10.000
385160-000 60 66.312 3.156 7 10.000
with Encoder 65 71.312 5.656 7 10.000
with Encoder 72 78.312 4.156 8 10.000
with Encoder 78 84.312 2.156 9 10.000
with Encoder 84 90.312 5.156 9 10.000
with Encoder 90 96.312 3.156 10 10.000
with Encoder 100 106.312 3.156 11 10.000
with Encoder 110 116.312 3.156 12 10.000
with Encoder 120 126.312 3.156 13 10.000
------
------
.110 ± .005
M4 Thru
.750 ± .005
∅∅
∅ .312 Thru
∅∅
∅∅
∅ .500 C’bore x .160 Dp.
∅∅
“X” No. of holes
“A” Ref.
ACU-RITE
®
6
ENC150 Mounting Requirements
Mounting options can be adapted to machine mounting surfaces
Center support
1/4-20 x 3/4” SHCS
using spacers, standoffs, or leveling set screws.
• Measuring length and mechanical configuration of your machine
Support washer
determine your options.
• Backup spar mounting is an option but not required for lengths
up to 60”.
.94 [23.8]
Scale
washer
• Fastener lengths described on this page are included with the
encoder or the backup spar.
End hole mounting
with center support
• 24” to 60” : Use end mounting holes with center support.
End hole mounting
1/4-20 x 1” BHCS
& scale washer (supplied)
Backup spar mounting
1/4-20 x 1/2” BHCS
& spar washer (supplied)
• Less than 24” : Use end mounting holes. • Over 60” : A backup spar is required.
7 ACU-RITE
1/4-20 x 1” BHCS
Typical (supplied)
M4 x 8mm SHSS
(supplied)
®
T ypical Mounting (s) ENC 150
A variety of mounting conditions can be accommodated.
• The machine configuration determines the brackets required to
install the linear encoder.
• Three typical mounting conditions are shown; flush, offset, and
backup spar (as shown previously on page 4).
• The 8-32 SHCS fastener lengths shown on this page are supplied
with the encoder hardware.
• The 8-32 SHCS for mounting the reading head is a standard low
head style fastener.
Flush surfaces
1/4-20 x 1” BHCS
and encoder washer
8-32 x 3/4” SHCS
0.0 ± .005
ll .005
Offset surfaces
1/4-20 x 1” BHCS
with encoder washer
8-32 x 3/4” SHCS
Space of < .18” use reading head
leveling set screws.
• Mounting surfaces are offset.
• Installation without backup spar.
• Use leveling screws in place of spacers or shims.
Backup spar with bracket
1/4-20 x 1/2” BHCS
and spar washer
8-32 x 5/8” SHCS
1/4-20 x 1/2”
BHCS and washer
(trim if necessary)
A space >.18”, use a spacer or
bracket (shown); <.18” use
leveling set screws.
• Mounting surfaces are flush within .005”.
• The reading head leveling screws are not required.
ACU-RITE
®
• Flush or offset mounting surfaces with a backup spar.
• Bracket used to reduce head to mounting surface gap.
• Use reading head leveling set screws.
8
ENC150 Encoder Installation Procedure
These steps apply to all encoder mounting conditions, if a spar is
being used, go to “Spar Installation Procedure” on page 11.
• ACU-RITE bracket kit instructions supercede this
section.
• Adjust drill depths and fastener lengths as required.
• When instructed on page 10: Adjust the leveling set screws
as follows:
1. Insert, but do not tighten 8-32 (M4) reading head screws.
2. Place a .001”-.003” shim between the leveling set screws and
mounting surface.
3. Adjust each set screw until a slight drag is felt on the shim.
4. Evenly tighten the 8-32 (M4) reading head mounting
screws.
• Contact your Authorized ACU-RITE Distributor should you
require additional assistance.
C
Scale case
Alignment
brackets (2)
L
Center marks
Cable assembly
Reading head assembly
• Align the center marks on the reading head and scale assembly by
sliding the reading head and brackets along the case.
Center mounting axis
C
L
Mark center of travel
• Move the machine axis to its center of travel.
• Mark the axis for quick return to center.
• Configure the encoder cable exit direction (see page 3).
-A- = Axis travel
Axis parting line
Endcap
Align top of scale case to
within .015” of -A-
Scale case
End mounting hole (typical)
• Locate the scale case so underside of end caps are flush with the
axis parting line.
• Mark one end mounting hole location.
9 ACU-RITE
®
Encoder Installation Procedure ENC 150
-A- = Axis travel
-A-
Drill / tap
for 1/4-20 (M6).
Align to within .010” TIR to -A-
1/4-20 x 1” BHCS & Scale flat washer (M6 x 25mm)
• Drill / tap the first end mounting hole / attach the linear encoder.
• Align to within .010” TIR. to -A-, drill / tap second end hole.
• Attach the linear encoder / align to within .010” TIR. to -A-.
Do not tighten prior to adjusting leveling set screws
• 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.
Drill / tap for 8-32 (M4)
8-32 x 3/4” SHCS
(M4 x 20mm)
Center support
Flat washer (M6)
1/4-20 x 3/4” SHCS
(M4 x 20mm)
• Use the center support(s) when provided.
• Place supports at equal intervals along the encoder’s length.
ACU-RITE
®
Alignment bracket removal
Twist 45°
Slide brackets away from reading head and cable.
• Slide the brackets away from the reading head.
• Remove the alignment brackets and save for future use.
• Proceed to page 13, “Checking Your Installation”.
10
ENC150 Spar Installation Procedure
These steps apply to all spar mounting conditions.
• ACU-RITE bracket kit instructions supercede this
section.
• Adjust drill depths and fastener lengths as required.
• When instructed on page 12: Adjust the leveling set screws
as follows:
1. Insert, but do not tighten 8-32 (M4) reading head screws.
2. Place a .001”-.003” shim between the leveling set screws and
mounting surface.
3. Adjust each set screw until a slight drag is felt on the shim.
4. Evenly tighten the 8-32 (M4) reading head mounting
screws.
• Contact your Authorized ACU-RITE Distributor should you
require additional assistance.
Center
mounting
axis
C
L
Mark
center of
axis
-A- = Axis travel
Axis parting line
Align top of spar to
within .015” of -A-
End mounting hole (typical)
• Locate the spar with the underside flush with the axis parting line.
• Mark one end mounting hole location.
-A- = Axis travel
1/4-20 x 1/2” BHCS &
Flat washer .017” thk.
Align to within .010” TIR of -A-
• Move the axis to its center of travel.
• Mark the axis for quick return to center.
• Determine encoder cable exit direction and adjust (see page 3).
• Drill / tap the first end mounting hole / attach the spar.
• Align to within .010” TIR. to -A-, drill / tap second end hole.
• Attach the spar / align to within .010” TIR. to -A-.
11 ACU-RITE
®
Spar Installation Procedure ENC 150
M4 x 8mm set screws
8-32 x 5/8” SHCS
(M4 x 16mm)
Do not tighten prior to adjusting
leveling set screws.
• Insert the encoder into the spar.
• Center the encoder from end to end with the spar.
• Lock in place by tightening the M4 set screws.
Reading head bracket
8-32 x 5/8” SHCS
(trim if necessary)
• Attach the bracket to the machine.
• Align the reading head mounting holes with the bracket holes.
• Attach head to bracket / Set leveling screws / Secure fasteners.
Alignment bracket removal
Twist 45°
• To locate the reading head bracket, attach it to the reading head.
• Center the axis and mark the bracket mounting holes.
• Remove the bracket, drill / tap holes for 1/4-20 (M6).
ACU-RITE
®
Slide brackets away from reading head and cable.
• Slide the brackets away from the reading head.
• Remove the alignment brackets and save for future use.
• Proceed to page 13, “Checking Your Installation”.
12
ENC150 Checking Your Installation
Connecting
Provide slack
loops
Secure excess
cable
Attach connector
• 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.
Counting Test
Readout
• Move the axis and compare the display to the movement.
• Move the axis 20mm (.79”) to check reference mark operation.
These steps will confirm proper operation of your installation. The
counting Test confirms proper electrical operation. the Repeatability
Test checks the installation integrity
Counting Test:
• Configure the readout’s encoder and display resolution (see
manual).
• Move the axis and compare the display to the movement.
• Configure readout for sensing reference marks.
• Move each axis a minimum of 20mm (axis display should zero).
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.
Repeatability Test
Place dial indicator at the end of the moving
component (scale assembly or reading head).
• Zero the display and indicator.
• Move axis to the end of it’s travel return to dial zero.
• Readout should read zero ± 1 count.
13 ACU-RITE
®
Electrical Shielding ENC 150
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
ΩΩ
Ω
ΩΩ
max.
ACU-RITE
®
14
ENC 150 Trouble Shooting
If you experience difficulties with your installation, do the
following to determine the problem.
Checking the Readout
Difficulties on more than one axis are usually associated with
the readout. Follow these steps 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
Problems on a single axis are usually associated with the linear
encoder or its installation. Difficulties 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
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.
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 ACU-RITE Distributor for
instructions prior to removing the encoders or readout .
15 ACU-RITE
®
Mechanical Specifications ENC150
Mechanical Specifications Digital Analog
Resolution 2 µm 10 µm 0.5 µm 1 µm 5 µm
Grating pitch 40 µm 20 µm 40 µm 20 µm
Scale medium Light transmission through chrome-coated glass
Accuracy (@ 20° C) / 1000mm ± 3µm, ± 5µm
Max. slew speed 40 inches/sec
Force required to move < 0.75 lbs
reading head
Operating Environment
Temperature 0° to 40° C
Relative Humidity 25% to 95% (non-condensing)
Storage Environment
Temperature - 40° to 65° C
Humidity 20% to 95% (non-condensing)
Weight w/armor 1.4 + 0.5 lbs/in of measuring length
Connecting cable Length = 5, 10, and 15 ft.
armored or vinyl Connector: DE-9P or Bendix PTO 6A-10-6P
Max. cable length 35 ft
Measuring lengths 2” - 120”
Reference pulse interval Distance or coded
-
ACU-RITE
®
16
ENC 150 Output Signals and Pin-Outs
Digital Differential
Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9
N/C Green Yellow Blue Red White Brown Pink Gray
N/C Channel Channel Channel Channel Ground Vcc, + 5.1 Channel Channel
A+ A- B+ B- ± 0.1 VDC @ 140mA max. R+ R-
5
1
9
Analog Differential
6
Pin 1 Pin 2 Pin 3 Pin 4 Pin 5 Pin 6 Pin 7 Pin 8 Pin 9
White Green Yellow Blue Red N/C Brown Pink Gray
Ground Channel Channel Channel Channel N/C Vcc, + 5.0 Channel Channel
A+ A- B+ B- ± 0.1 VDC @ 80 mA max. R+ R-
Large key
A
B
Digital single ended
Pin A Pin B Pin C Pin D Pin E Pin F
Green Blue Brown White Drain Pink
Channel A Channel B
Vcc, + 5.1 Common (power supply Shield, reading head Channel R
± 0.1 VDC @ 140mA max. and return signal return) casting ground (Reference Mark)
17 ACU-RITE
®
Electrical Specifications ENC150
Parameter Analog
Output Signals
Incremental signals
Digital
=(High level output current) = 20mA
I
OH
VOH=(High level output voltage) >2.5Vdc
360°
0°
Channel A+
Channel A-
1
0
1
0
Channel R+
Channel R-
90°
Channel B+
Channel B-
I
OL
VOL=(Low level output voltage) < 0.5Vdc
1
0
1
0
=(Low level output current) = 20mA
1 Count
Square-wave voltage signals.
Channels A and B, in 90°
1
IµA
0
1
0
135° ± 20°
IµA
Similar phasing, but differential
sinusoidal current output
quadrature relationship
7-16µA
Signal levels
Reference Mark signals
TTL-level
Square-wave pulse
w/1 K Ohm load
Differential current output
2-8µA
Signal level
TTL-level
w/100 K Ohm load
Channel B
Channel A
Channel R
pp
pp
0°
90°
360°
360° ±
60°
I
:7-16 µA
A, B
IR:2-8 µA
pp
pp
Power Supply
ACU-RITE
5.1 ± 0.1 VDC @ 100 mA max. 5.1 ± 0.1 VDC @ 70 mA max.
®
18
ENC 150 Warranty
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 distributors will provide field service labor 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. ACURITE shall have no obligation, with respect to any defect or other
condition caused in whole or in 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 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
All ACU-RITE products are covered by a 30-day Red Carpet
Warranty. If in the first 30 days this product fails for any reason, repackage it in the original packaging materials and contact
your Authorized ACU-RITE Distributor for return procedures.
19 ACU-RITE
®
Notes
ACU-RITE
®
20
ACU-RITE IS AN
ISO 9001
CERTIFIED
MANUFACTURER
®
ACU-RITE
ACU-RITE COMPANIES INC.
One Precision Way • Jamestown, NY 14701
101000-170 EDITION M 8/03
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