ACU-RITE ENC 250MS User Manual
ENC 250TM MULTI-SECTION
REFERENCE MANUAL
Acu-Rite Companies Inc.
™
ENC 250
MULTI-SECTION
Table of Contents
Introduction
Bracket availability ...........................................................1
Components supplied .........................................................2
Tool requirements ..............................................................2
Mounting Preparation
Measuring length ................................................................2
Cable exit ............................................................................2
Mounting information ........................................................3
Encoder Dimensions ...........................................................3
Mounting Requirements ....................................................4
Installation
Left end section ...................................................................4
Center section(s).................................................................5
Right end section ................................................................6
Dowel pin anchoring ...........................................................6
Page
Page
Tape .....................................................................................7
Lip seal ................................................................................7
Reading head.......................................................................8
Completing the installation
Tape tensioning................................................................... 9
Specifications
Electrical shielding ...........................................................10
Trouble Shooting ...............................................................10
Mechanical ........................................................................11
Electrical ...........................................................................11
Pin out ...............................................................................12
Hassle-Free Warranty .......................................................12
Brackets ...
Off set side
mount bracket
Universal side mounting bracket
(Available in different lengths)
Introduction
The ENC 250 linear encoder provides the accuracy and
reliability of an Acu-Rite Companies Inc. measuring system
with digital output. Features and options include:
• Resolution of [.0002in.] 5µm
• Accuracy grade of [.00018 in/ft] +/-15µm/M
• [2 ft.] .61m armor cable and extension cables up to a
maximum of [75 ft.] 22.9m for a VRO; [35 ft.] 10.7m for a
DRO
• Mounting hardware
• Brackets and accessories
Contact your Authorized Distributor for a complete list of
other products and accessories.
Reading head
mounting plate
Combination
reading head bracket
w/extension
• Installation brackets are available.
• Your authorized distributor can assist you in selecting
brackets for your installation.
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: _______________ _________________
Tape tension value: __________________________________
Date of purchase: ___________________________________
Distributor: ___________________________________
Address: ___________________________________
Telephone: ___________________________________
1
Acu-Rite Companies Inc.
ENC 250
™
MULTI-SECTION
Components
Each unit should consist of the following boxes:
Scale Section Boxes:
• Right End Section
• Left End Section
• Center Sections (One or more boxes depending on length)
Common Components Box:
• Scale Measuring Tape (Coiled On Spool)
• Lipseals (Coiled On Spool)
• Reading Head
• Mounting Hardware with RTV and Silicone Grease
• Reference Manual
* NOTE: Both English and metric mounting hardware have
been supplied. The mounting instructions reference to both.
Tools required depend on the fasteners being used.
Mounting Preparation
Tools
You will need the following tools to complete the
installation:
• 0.001” Dial Indicator with Magnetic Base
• English Hex Wrench Set
• Metric Hex Wrench Set
• Dial Calipers
• Feeler Gage
• Hand Drill
• Hand Tap
• Taps (English): 1/4-20 UNC & #8-32 UNC
• Taps (Metric): M6, M4
• Drills (English): #7 (.201”), #29 (.136”), N (.302”)
• Drills (Metric): 5mm, 3.3mm, 7.7mm
• Reamer (English): .312”
• Reamer (Metric): 8mm
• Transfer Punch Set
• Hammer
• Center Punch
• Phillips Screw Driver
• Flat-tip Screw Driver
• Torque Wrench
Measuring length ...
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.
• Locate the machine’s center of travel on the axis that
the encoder will be mounted to. Move the axis to the
center of travel prior to installing the encoder. Mark
a reference line on the axis so that it can easily be
returned to the center of travel.
Coolant spray ...
[1.0”]
25mm
“L”
“L” = Measuring length + [2.0”] 50.8mm nominal over travel
Travel is limited by stops at each end of scale
[2.8”]
71.1mm
• Machine travel can not exceed the encoder measuring
length.
• Either limit machine travel or obtain correct length scale.
Changing cable exit direction ...
Plug
Cover plate
T-10 Torx screw (2)
• Encoder lip seals to face away from coolant spray.
Armor cable hex crimp
• Determine the cable exit direction before installing the reading
head.
• To change the cable exit direction; remove the cover plate
and rotate the cable 180°.
2
Acu-Rite Companies Inc.
ENC 250
™
MULTI-SECTION
Mounting Information
Use this information to plan your Linear Encoder installation.
• Mount the linear encoders close to machine guide ways to
ensure system accuracy.
• Space between reading head casting and mounting bracket
or surface must not exceed [.188”] 4.7mm.
Alignment bracket removal clearance
Alignment bracket
[1.0]
25mm
[1.0]
25mm
(2)
End of scale clearance requirements ...
[1.0] 25mm
[5.0]
127mm
[5.0]
127mm
• Minimum clearance is required above the scale case top.
• A minimum clearance of [5.0] 127mm is required at each
end of the scale case.
Positioning ...
Horizontal
mounting
Vertical
mounting
• Allow clearance for alignment bracket removal.
Alignment brackets must not be removed until
•
instructed.
Encoder Dimensions
• Mount encoder in a horizontal or vertical position as shown.
• Do not mount flat or inverted.
[.83]
21.0
[.37]
9.4
[3.2]
81.3
3
Acu-Rite Companies Inc.
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