US Digital

Parameter	Max.	Units
Vibration (5 to 2kHz)	20	g
Shaft Axial Play	0.01	in.
Shaft Eccentricity Plus Radial Play	0.004	in.
Acceleration	250,000	rad/sec²
Maximum RPM e.x. CPR = 2500, max. rpm = 2400 e.x. CPR = 1000, max. rpm = 6000 e.x. CPR = 64, max. rpm = 60000	minimum value of (6000000/CPR) and (60000)	rpm

• Note that radial play translates directly to position inaccuracy.
• Note: 60000 rpm is the maximum rpm due to mechanical considerations. The maximum rpm due to the module's 100kHz maximum count frequency is (6000000/CPR).

 

A leads B for clockwise shaft rotation, and B leads A for counterclockwise rotation viewed from the cover/label side of the encoder (see the EM1 / HEDS page).

• Specifications apply over entire operating temperature range.
• Typical values are specified at Vcc = 5.0Vdc and 25°C.
• For complete details see the EM1 and HEDS product pages.

	Supply Current	Output voltage low	Output voltage high
Resolution	Typ / Max	Max	Min	Based on
100, 200, 400, 500, 512, 1000, 1024 CPR, non-index	17 / 40 mA	0.4 volts @ 3.2mA	2.4 volts @ -200uA	Low-res HEDS
2000, 2048 CPR, non-index	57 / 85 mA	0.5 volts @ 8mA	2.4 volts @ -40uA	High-res HEDS
64 CPR, with index	27 / 30 mA	0.5 volts @ 8mA	2.0 volts @ -8mA	EM1
100, 200, 400, 500, 1000, 1024 CPR, with index	57 / 85 mA	0.5 volts @ 8mA	2.4 volts @ -40uA	High-res HEDS
1800 CPR, with index	55 / 57 mA	0.5 volts @ 8mA	2.0 volts @ -8mA	EM1
2000, 2048 CPR, with index	57 / 85 mA	0.5 volts @ 8mA	2.4 volts @ -40uA	High-res HEDS
2500 CPR, with index	55 / 57 mA	0.5 volts @ 8mA	2.0 volts @ -8mA	EM1

Parameter	Torque
Hub Set Screw to Shaft	2-3 in.-lbs.
Cover (4-40 screws through cover into base)	2-3 in.-lbs.
Base to Mounting Surface	4-6 in.-lbs.
Base to Mounting Adapter Plate	4-6 in.-lbs.
Adapter Plate to Mounting Surface (4-40 screws)	4-6 in.-lbs.
Adapter Plate to Mounting Surface (6-32 screws)	6-8 in.-lbs.

Be sure to keep different diameters, resolutions and options separated. The resolution of the optoelectronic modules and the code wheels must match. Index and non-index parts cannot be mixed since the optical patterns are different. An identifier is stamped on each optoelectronic module.

For Agilent Modules (HEDS): The 2-channel (non-index) version can be identified by a 9100 or 9200. The 3-channel (index) version can be identified by a 9140. One suffix letter specifies the resolution as shown in the table below.

For US Digital Modules (EM1): The first number identifies the size of the disk this module is to be used with. The second number identifies the resolution as shown in the table below. The 3-channel (index) version is standard and not denoted unless the module is non-index. The 2-channel (non-index) can be identified by a -N.

Disk	Standard	Index
64	-	2-64
100	S	S
200	C	C
400	E	E
500	E	F
512	A	-
1000	B	B
1024	J	J
1800	-	2-1800
2000	T	T
2048	U	T
2500	2-2500-N	2-2500

Pin	Description
1	Ground
2	Index
3	A channel
4	+5VDC power
5	B channel

Index

Provides a single pulse per revolution.

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3-option

3-option makes all five of these hole diameters .125". If desired, the two .096" diameter recesses will mate with matching aligning pins. The .438" diameter center hole can also mate with a motor boss. If a motor boss is lacking, a centering tool is usually required to mount the base in proper position to the shaft.

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E-option

The E-option provides a cylindrical extension to the cover allowing for longer shafts of up .670". This option is only for shaft diameters <.472".

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H-option

The H-option adds a hole to the cover for the shaft to pass through.

• Shafts <=1/2", a 0.55" diameter hole is supplied.
• Shafts >1/2", a 1.05" diameter hole is supplied.

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M-option

These adapter plates are for mounting to a 3" diameter bolt circle. Use two 4-40 x 1/4" screws (sold separately) to attach the E3 base to the plate. Comes attached when ordered with encoder.

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T-option

When mounting holes are not available, a pre-applied transfer adhesive (with peel-off backing) is available for "stick-on" mounting. Use the centering tool (sold separately) to slide the base into position. T-option specifies transfer adhesive on the standard mounting base.

Instructions: To use transfer ahesive, peel off paper backing and slip tool into center hole of the base and slide both down shaft as one piece. Press to form a good bond, then slip tool off and continue with the standard mounting instructions. A centering tool is highly recommended when using transfer adhesive.

For Shafts Greater Than 0.394" (10mm):

• 

  1. Base Mounting

  Secure the base to the mounting surface using two or three screws (sold separately). If a centering tool is used, slip it over the shaft and into the center hole of the base. Tighten the mounting screws and then remove the centering tool.

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  2. Spacer Installation

  Push the spacer tool onto the bottom section of the hub/disk assembly. Make sure the spacer tool snaps only on the lower part of the hub. Align hub set screws as shown in drawing.

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  3. Hub/Disk Assembly Installation

  Slip the hub over the shaft until it bottoms out against the spacer tool. Make sure the spacer tool clears the mounting screws on the base. Tighten both set screws with the hex wrench provided while pressing down on the hub. Remove the spacer tool.

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  4. Encoder Module Installation

  Orientate the module with the connector pins toward the top. Slide the module from front to back, being careful not to damage the disk. Stop when the two alignment pins on the base fit into the holes of the module. Secure with two 4-40 1/2" pan head screws (supplied).

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  5. Cover Installation

  Place the cover over the assembly and secure with the two 4-40 5/8" flat head screws (supplied).

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For Shafts Less Than or Equal To 0.394" (10mm):

• 

  1. Base Mounting

  Secure the base to the mounting surface using two or three screws (sold separately). If a centering tool is used, slip it over the shaft and into the center hole of the base. Tighten the mounting screws and then remove the centering tool.

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  2. Spacer Installation

  Place the spacer tool around the shaft, flat on the base.

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  3. Hub/Disk Assembly Installation

  Slip the hub over the shaft until it bottoms out against the spacer tool. Tighten the set screw with the hex wrench provided while pressing down on the hub. Remove the spacer tool.

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  4. Encoder Module Installation

  Orientate the module with the connector pins toward the top. Slide the module from front to back, being careful not to damage the disk. Stop when the two alignment pins on the base fit into the holes of the module. Secure with two 4-40 1/2" pan head screws (supplied).

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  5. Cover Installation

  Place the cover over the assembly and secure with the two 4-40 5/8" flat head screws provided.

Centering Tools

* May need to order separately, only included with PKG3-packaging option.

Part #: CTOOL - (Shaft Diameter)

Description:This reusable tool provides a simple method for accurately centering the E3 base onto the shaft in order to promote concentricity and thus, higher accuracy. It is recommended for the following situations:

• When using mounting screws smaller than 4-40.
• When the position of the mounting holes is in question.
• When using the 3-hole mounting pattern.
• When using the T-option transfer adhesive.

Instructions: When mounting encoder base, slide centering tool down shaft until it slips into centering hole of encoder base. Tighten mounting screws, then remove centering tool.

Hex Tools

* May need to order separately, see below for more information.

Part #: HEXD-050

Description: Hex driver, .050" flat-to-flat for 3-48 or 4-48 set screws. Only included with default or PKG1-packaging options.

Part #: HEXW-050

Description: Hex wrench, .050" flat-to-flat for 3-48 or 4-48 set screws. Only included with PKG2 or PKG3-packaging options.

Spacer Tools

* May need to order separately, see below for more information.

Part #: SPACER-265

Description: For shafts <=.394".

Part #: SPACER-260

Description: For shaft sizes 12MM or 1/2 IN.

Part #: SPACER-555

Description: For shafts >=.551".

Screws

* For base mounting only, screws for mounting the housing to the base are already included.

Part #: SCREW-080-250-PH

Description: Pan Head, Cross Drive 0-80 UNF x 1/4"

Quantity Required for Mounting: 3 per encoder

Part #: SCREW-256-250-PH

Description: Pan Head, Cross Drive 2-56 UNC x 1/4"

Quantity Required for Mounting: 2 per encoder

Part #: SCREW-440-250-PH

Description: Pan Head, Cross Drive 4-40 UNC x 1/4"

Quantity Required for Mounting: 2 per encoder