MicroScale™ REFERENCE MANUAL ACU-RITE ®
MicroScale Table of Contents Page Introduction / Supplied items ................................................... 2 Page Checking the Installation ......................................................... 10 Key Points / Tolerances ............................................................. 3 Troubleshooting ....................................................................... 11 Linear Encoder Dimensions ...................................................... 4 Spar Dimensions ..................
Introduction / Supplied Items MicroScale For future ordering information or warranty service, record the linear encoder catalog and serial numbers. The MicroScale Precision Glass Scale Linear Encoder provides the accuracy and reliability of an ACU-RITE measuring system in a very small cross-section with digital output (analog output available). Features and options include: • Resolutions of 0.5, 1 or 5µm. • Accuracy grades of ± 3 or ± 5 µm / 1000mm. • Position Track.
MicroScale Key Points / Tolerances Use this information to plan your Linear Encoder installation. • Understand your mounting requirements. • Follow kit instructions when using an ACU-RITE 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. • Surfaces must be in good condition, clean and free of dirt and paint. • Do not remove shipping brackets until instructed.
Linear Encoder Dimensions MicroScale Measuring length + 4.65 [118] .280 [7.11] Typ. Measuring length + 4.09 [103.9] Scale case Scale assembly Mounting hole End cap .335 [8.51] .670 [17.00] .482 [12.25] .Gap .059 ± .005 [1.50] 1.182 [30.00] Reading head assembly .463 [11.76] .140 [3.55] for M4 Hex nut 1.85 [47.00] 2.775 [70.50] .175 [4.57] Typ. .213 [5.41] Typ. 2.350 [59.69] Strain relief and cable Ø .30 [7.6] Armor 2.0 [50] Approx. Ø .160 min bend radius [4.00] min. of armor .280 [7.11] .
MicroScale Backup spar Part Number 384611-101 384611-102 384611-103 384611-104 384611-105 384611-106 384611-107 384611-108 384611-109 384611-110 384611-111 384611-112 384611-113 384611-114 384611-116 .330 Spar Dimensions Linear Encoder Measuring Length 1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 L A 5.650 6.650 7.650 8.650 9.650 10.650 11.650 12.650 13.650 14.650 15.650 16.650 17.650 18.650 20.650 .825 .825 1.325 1.825 2.325 2.825 3.325 3.825 1.825 2.325 2.825 3.325 3.825 1.825 2.825 X No.
Mounting Requirements MicroScale 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. • Backup spar mounting optional for all lengths 18” or less. • Mount the backup spar following the same procedure as required for mounting without a backup spar, using the same tolerances.
MicroScale Typical mounting A variety of mounting conditions can be accommodated. Spar mounting • 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 (mounting plate example shown). Flush mounting surfaces Offset mounting surfaces // .030 // .005 • Mounting surfaces are flush within .
Encoder Installation Procedure MicroScale 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 Bracket Kit instructions supercede this section. • General steps for small X & Y stage. • Adjust drill depths and fastener lengths as required. • Contact your Authorized ACU-RITE Distributor if assistance is required. CL Mark center of axis • Center the axis.
MicroScale Installation Procedure Align to within .005” to axis travel Axis travel Use shipping brackets to maintain head alignment. Drill / tap for 6-32 (M3). Drill / tap for 6-32 (M3). CL 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. • Align to within .005” TIR. and drill / tap second end hole. • Attach scale case & align to within .005” TIR. of the axis travel.
Checking the Installation MicroScale 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 Secure excess cable • • • • • • • • Attach connector Configure the readout for proper counting resolution. Move axis and compare the display to the movement. Repeat test for mechanical integrity and repeatability.
MicroScale 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. 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.
Mechanical Specifications MicroScale Mechanical Specifications Resolution Digital 0.5µm Analog 1µm 5µm Grating pitch 20µm Scale medium Light transmission through chrome-coated glass Accuracy (@ 20° C) / 1000mm ± 3µm, ± 5µm Max. slew speed (inches/sec) @ 10° C to 30° C @ 0° C to 40° C 40 21 Force required to move reading head < 0.
MicroScale 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 A+ Channel A- Channel B+ Channel B- Ground Vcc, + 5.1 ± 0.1 VDC @ 140mA max.
Electrical Specifications MicroScale Parameter Digital Output Signals IOH=(High level output current) = 20mA VOH=(High level output voltage) >2.5Vdc 0° 1 0 Channel A- 1 0 Channel A+ Analog 0° 90° 360° Channel R+ Channel R- 90° 1 0 1 IA, B:7-16 µApp IµA Channel B Channel A 0 1 1 Count (Phased) 0 1 Channel B0 IOL=(Low level output current) = -20mA VOL=(Low level output voltage) >0.
MicroScale ACU-RITE 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 service labor. In addition, authorized ACU-RITE service representatives will provide service labor (field service) for a oneyear period at no charge.
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