SENC 50
REFERENCE MANUAL
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SENC 50
Table of Contents
Page
Page
Checking the Installation.................................................... 10
Electrical Shielding.............................................................. 11
Troubleshooting ................................................................... 12
Introduction / Supplied items ............................................... 2
Key Points / Tolerances ......................................................... 3
Linear Encoder Dimensions .................................................. 4
Spar Dimensions .................................................................... 5
Mechanical Specifications ................................................... 13
Output Signals and Pin-Outs.............................................. 14
Electrical Specifications ...................................................... 15
Mounting Requirements........................................................ 6
Typical Mounting ................................................................... 7
Encoder Installation Procedure ............................................ 8
The Acu-Rite Companies Inc.
Hassle Free Warranty & Service ........................................ 16
Adjustable front or
rear mount
Spar
Front mount
bracket
Front mount
bracket
Bottom mount
bracket
Base mount
• Installation brackets and kits are available.
• Your Authorized Distributor can assist you in selecting
brackets and tools for your installation.
1
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Introduction / Supplied Items
SENC 50
The SENC 50 Precision Glass Scale Linear Encoder provides For future ordering information or warranty service, record the
the accuracy and reliability of an Acu-Rite Companies Inc. linear encoder catalog and serial numbers.
measuring system in a very small cross-section with digital
Catalog #
Serial #
Manufacture Code #
output (analog output available). Features and options include:
Axis # 1:
Axis # 2:
Axis # 3:
Axis # 4:
_____________________________________
_____________________________________
_____________________________________
_____________________________________
•
•
•
•
•
•
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.
Date of Purchase _____________________________________
Distributor:
_____________________________________
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.
Address:
Telephone:
_____________________________________
_____________________________________
Shipping carton
contents
B
A
A) SENC 50 linear encoder
B) Reference Manual
C) Encoder and Cable
Mounting Hardware
C
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SENC 50
Key Points / Tolerances
// .005 B
// .005 A
Use this information to plan your Linear Encoder installation.
• Understand your mounting requirements.
• Follow kit instructions when using an Acu-Rite Companies
Inc. 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.
// .005 A
Gap
.059 ±.005”
[1.50]
B
-A- = Machine travel
Center support surface
required
Reading head
assembly
Scale assembly
• Surfaces must be in good condition, clean and free of
dirt and paint.
// .005 A
•
Do not remove shipping brackets until instructed.
// .005 A
• Shipping bracket spacers can be used to insure .059” gap.
• Mount from either side to obtain desired cable exit direction.
Equal
Equal
• Tolerances of .005” TIR apply to all mounting dimensions.
• Center support surface required for all measuring
lengths when not using a back up spar.
Shipping bracket removal clearance
Total head travel
1.00
1.00
.037 [.9]
Min.
.26 [6.6]
Min.
Slide brackets away
from the reading head
Measuring length + 1”
[25.4] over travel
• Allow clearance for shipping bracket removal.
• Limit equipment travel to less than measuring length.
3
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Linear Encoder Dimensions
SENC 50
Measuring length + 4.65 [118]
Measuring length + 4.09 [103.9]
.280
[7.11]
Typ.
.335
[8.51]
.482
.670
[17.00]
[12.25]
Scale case
Mounting hole
Scale assembly
.Gap
.059 ± .005
[1.50]
End cap
1.182
[30.00]
Reading
head
Ø .16
[4.1]
Vinyl
Ø .30
[7.6]
for M4
Align both
surfaces
Strain relief
Hex nut
assembly
.463
and cable
.140
[3.55]
Armor
1.85
[47.00]
.170
[4.32]
[11.76]
.02
[0.5]
2.0 [50] Approx.
min bend radius
of armor
Ø .160
[4.00] min.
2.775
[70.50]
.175 [4.57]
Typ.
.280
[7.11]
.840
[21.34]
2.350
[59.69]
.213
[5.41]
Typ.
1.352 [34.34]
.150
[3.81]
Spar
.170
[4.32]
.652
[16.56]
.138
[3.50]
.295
[7.50]
.159
[4.04] Typ.
M3 x .25 [6.31]
deep min.
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SENC 50
Spar Dimensions
Backup spar
Part Number
680803-01
680803-02
680803-03
680803-04
680803-05
680803-06
680803-07
680803-08
680803-09
Linear Encoder
Measuring Length
L
A
X No.
Places
B
Backup spar
Part Number
Linear Encoder
Measuring Length
L
A
X No.
Places
B
1
2
3
4
5
6
7
8
9
5.650
6.650
7.650
8.650
9.650
10.650
11.650
12.650
13.650
.825
.825
2
2
2
2
2
2
2
2
3
4.000
5.000
5.000
5.000
5.000
5.000
5.000
5.000
5.000
680803-10
680803-11
680803-12
680803-13
680803-14
680803-15
680803-16
680803-18
680803-20
10
11
12
13
14
15
16
18
20
14.650
15.650
16.650
17.650
18.650
19.650
20.650
22.650
24.650
2.325
2.825
3.325
3.825
1.825
2.325
2.825
1.325
2.325
3
3
3
3
4
4
4
3
3
5.000
5.000
5.000
5.000
5.000
5.000
5.000
10.000
10.000
1.325
1.825
2.325
2.825
3.325
3.825
1.825
Spar
fastener
Encoder
retaining clip
Spar leveling
screws
Backup spar mounting optional for all lengths
Ø .196 Drill thru
Ø .344 C’bore x .100 Dp.
“X” no. of places
Clip mounting
screws
.075
.330
Backup spar
mounting
.510
“A”
Ref.
“A”
± .005
B Typ. ±.005
Non accumulative
±.015
L
5
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Mounting Requirements
SENC 50
Mounting options can be adapted to machine mounting surfaces
using spacers, standoffs, and leveling screws.
Center support
assembly
• Measuring length and mechanical configuration of your
equipment 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.
• 8” and larger: End mounting holes with center support.
End mounting holes
• 7” and smaller: End mounting holes with encoder mounted to
a continuous flat surface, or with center surface on same plane
as end mounting surfaces.
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SENC 50
Typical mounting
Spar mounting
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 for reference.
// .030
• Flush or offset mounting surfaces using a spar.
• Reading head mounting bracket required (bottom mounting
bracket example shown).
Flush mounting surfaces
Offset mounting surfaces
// .030
// .005
• Mounting surfaces are flush within .005”.
• Installation without a backup spar.
• Offset mounting surfaces using a reading head bracket.
7
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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.
Center mounting axis
•
Acu-Rite Companies Inc. 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.
C
L
Mark center of axis
• Center the axis.
• Mark the axis for easy return to center.
Underside of end caps to be
flush with parting line of
upper slide.
Keep head and
Align top of scale case to
within .015” of axis travel
scale case
Scale case
surfaces flush
C
L
Scale case
Strain relief
Shipping
brackets (2)
Mark end mounting
hole location
End cap
and
Reading head
cable assembly
• Center the reading head on the scale case by sliding the head • Locate the linear encoder along the axis parting line.
and shipping brackets together along the scale case.
• Mark location of one end mounting hole in the scale case.
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SENC 50
Installation Procedure
Align to within
.005”
to axis travel
Use shipping brackets
to maintain .059
gap between
Drill / tap for 6-32
(M3).
Axis
travel
head and
scale case.
Drill / tap
for 6-32 (M3).
C
L
6-32 x 3/4” SHCS & M3
flat washer (M3 x 20mm)
6-32 x 3/4” SHCS & M3
flat washer (M3 x 20mm)
• Drill / tap the first end mounting hole / Attach the scale case. • Center the axis and mark the reading head mounting holes.
• Align to within .005” TIR. and drill / tap second end hole. • Move the axis and drill / tap holes for 6-32 (M3).
• Attach scale case & align to within .005” TIR. of the axis travel. • Attach head and align to scale case to within .005” TIR.
Slide bracket from reading head
and twist 45°
6-32 x 3/4” SHCS & M3 flat washer
(M3 x 20mm)
Retaining clip
Shipping bracket
Center support
(2)
• Slide shipping brackets from reading head and twist to remove
from the scale case.
• Save the shipping brackets with the Reference Manual.
• Use center supports when provided.
• Place at uniform intervals along the scale case.
9
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Checking the Installation
SENC 50
Connecting
These steps will confirm proper operation of your installation.
Counting tests check channel A and B output function and
Reference Mark tests check Reference Mark operation.
Provide slack
loops
• Configure the readout for proper counting resolution.
• Move axis and compare the display to the movement.
• Repeat test for mechanical integrity and repeatability.
• Configure the readout for sensing reference mark.
• Move the reading head approximately 20mm.
• Locate an indicator on scale end and zero out axis and
indicator.
Secure excess
cable
• Move axis out and back over full travel and return to dial
zero.
• Electronics should read zero ± 1 count.
• 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.
Place indicator at end of
Counting Test
moving component (scale case
shown, or reading head).
Readout
Repeatability Test
Readout
• 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.
• Check function of the linear encoder.
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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.
11
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Trouble Shooting
SENC 50
If you experience difficulties with your installation, there are
methods to analyze the difficulty. Operating difficulties can be
caused by either the linear encoders or the readout.
with other machine structures through the 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 3 “Key Points”. If the installation does not meet the
tolerances, reinstall the linear encoder according to the
procedures in “Installation”.
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.
• 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.
• 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.
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.
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
What to do
Linear encoder difficulties can be caused by improper
installation, loose or misaligned bracketry, or a damaged / failed
linear encoder.
If an Acu-Rite Companies Inc. 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.
Follow the steps below to determine the cause of your system
difficulties:
• Confirm that your bracketry and installation does not interfere
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SENC 50
Mechanical Specifications
Mechanical Specifications
Digital
Analog
Resolution
Grating pitch
Scale medium
0.5µm
1µm
5µm
20µm
Light transmission reflective off of chrome coated glass
Accuracy (@ 20° C) / 1000mm
Max. slew speed (M/s)
± 3µm, ± 5µm
1
Force required to move
reading head
< 0.5 (lbs)
Operating Environment
Temperature
Relative Humidity
0° to 50° C
20% to 95% (non-condensing)
Storage Environment
Temperature
Humidity
- 20° to 70° C
20% to 95% (non-condensing)
Weight
1.1 + 0.2 lbs/ft of measuring length [64g + 5.6g/in.]
Connecting cable
armored or vinyl
Length = 5, 13, and 19 ft.
Connector: DE-9P
Length = 5, 13, and 19 ft.
Connector: DE-9P
Max. cable length (ft)
Measuring lengths
20
26
75
75
1” - 20”
Reference pulse interval
Repeatability
50mm fixed or Position Trac
Within one resolution count
180
Operating current (ma)
Protection (IEC 529)
220
IP 53 when installed as per instruction
13
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Output Signals and Pin-Outs
SENC 50
Digital Differential
Pin 1
N/C
Pin 2
Green
Pin 3
Pin 4
Pink
Pin 5
Red
Pin 6
White
Pin 7
Black
Pin 8
Gray
Pin 9
Yellow
Brown
N/C
Channel Channel Channel Channel
Ground
Vcc, + 5.1
± 0.1 VDC
Channel Channel
A+
A-
B+
B-
R+
R-
1
5
6
9
Analog Differential
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Red
Pin 6
N/C
Pin 7
Black
Pin 8
Blue
Pin 9
Violet
White w/Grn Stripe & Brown Green
Yellow Orange
Ground
Channel
A+
Channel Channel Channel
A- B+ B-
N/C
Vcc, + 5.0
± 0.1 VDC
Channel Channel
R+ R-
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SENC 50
Electrical Specifications
Parameter
Digital
Analog
Output Signals
IOH=(High level output current) = 20mA
VOH=(High level output voltage) >2.5Vdc
0°
90°
360°
0°
360°
IA, B:7-16 µApp
or
1
1
Channel B
Channel A+
Channel A-
Channel R+
Channel R-
1 Count
1.0 Vpp
0
1
0
0
1
Channel A
0
90°
IR:2-8 µApp
or
1
Channel B+
Channel B-
Channel R
(Phased)
0
1
0
1.2 Vpp
I
OL=(Low level output current) = -20mA
VOL=(Low level output voltage) < 0.6Vdc
Similar phasing, but differential
sinusoidal current or 1 volt peak to peak output
Incremental signals
Signal levels
Square-wave voltage signals.
Channels A and B, in 90°
quadrature relationship
TTL-level
7-16µApp or 1.0 Vpp
w/1 K Ohm load
Square-wave signal
TTL-level
Reference Mark signals
Signal level
Differential current or 1 volt peak to peak output
2-8µApp or 1.2 Vpp
w/100 K Ohm load
5.0 ± 0.1VDC @ 75 mA max.
5.1 ± 0.1 VDC @ 220 mA max.
Power Supply
15
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Acu-Rite Companies Inc. Warranty
SENC 50
ACU-RITE Companies, Inc. is proud to offer the 3-Year Hassle-Free Warranty for all readout systems, and precision glass scales.
This warranty will cover all of the ACU-RITE repair and replacement costs for any readout or precision glass scale returned
during the three (3) year warranty period. ACU-RITE will repair or replace the damaged components regardless of the product’s
condition absolutely free, no questions asked. 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 (1) 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 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 Companies, Inc. shall not be
liable under any circumstances for consequential damages.
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Acu-Rite Companies Inc.
IS AN
ISO 9001
CERTIFIED
MANUFACTURER
Acu-Rite Companies Inc.
One PrecisionWay • Jamestown, NY 14701
516353-21 Ve01 8/2009
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