Cut Sheet

ManualsBrandsAvtron ManualsControl & AutomationSpeed Encoder

8901 E. PLEASANT VALLEY ROAD

INDEPENDENCE, OHIO 44131-5508

ELEPHONE: (1) 216-642-1230

•

AX: (1) 216-642-6037

E-MAIL: tachs@avtron.com

•

WEB: www.avtronencoders.com

Encoder

Instructions

HS25A

DESCRIPTION

The Avtron Model HS25A Hollow Shaft Rotary Incremental

Encoder is a speed and position incremental transducer (also

known as tachometer or rotary pulse generator). When mounted to

a motor or machine, its output is directly proportional to shaft

position (pulse count) or speed (pulse rate). The HS25A operates

down to zero speed and can be used for both control and

instrumentation applications.

The HS25A employs a hollow shaft and clamping collar to lock the

encoder to the shaft. A high-performance resin hollow shaft insert

provides electrical isolation from motor shaft currents and permits

models to fit a broad range of shaft sizes from 3/8" to 5/8" [6mm -

16mm]; 3/4" [20mm] is permitted by omitting any insert. An anti-

rotation bracket prevents rotation of the encoder while allowing for

shaft end float and axial movement.

The HS25A encoder offers 2Ø outputs (A,B) 90° apart for direction

sensing (A Quad B), with complements (A

–

), and with marker

pulse and complement (Z,Z

–

INSTALLATION CONSIDERATIONS

See page 3 and drawing on last page for shaft engagement rules.

Shaft may include keyway, but should not be flatted.

The HS25A offers optional Avtron flexible anti-rotation tethers/

brackets which will permit the encoder to tolerate ±0.1" of shaft

end float/axial movement. Select the proper tether for the

application from the table below.

CAUTION

Be careful not to damage clamping fingers of hollow shaft

during handling. Do not tighten clamping collar before

installation onto motor shaft.

WARNING

Installation should be performed only by qualified personnel.

Safety precautions must be taken to ensure machinery

3/8" to 3/4" [6mm-16mm]

OLLOW SHAFT

cannot rotate and all sources of power are removed during

installation.

WARNING

Be certain to identify thread locker and anti-seize compound

correctly. Using anti-seize in place of thread locker can cause

mechanical failure leading to equipment failure, damage, and

harm to operators.

INSTALLATION

Refer to the back page of these instructions for outline and

mounting dimensions. Also available: EU (European Union)

Installation Sheet and Basket Mount Installation Sheet.

1) Use caliper gauge to verify motor shaft is proper diameter and

within acceptable tolerances shown on back page.

2) Clean machine shaft of any dirt and remove any burrs.

3) Use dial indicator gauge to verify the motor shaft Total

Indicated Runout (TIR) < 0.002".

4) Install the anti-rotation bracket to the face of the encoder using

6-32 screws and thread locker.

5) Loosen clamping collar and insert shaft sizing insert into

encoder. DO NOT FORCE. (NOTE: To fit an HS25A on a 0.75"

shaft, use no insert.)

6) Test Fitting: carefully slide the encoder onto the shaft to verify

fit. Ensure a minimum of 1/8" between encoder and mounting

Equipment Needed for Installation

Provided Optional Not Provided

HS25A Encoder

Clamping Collar

Thread Locker

(blue)

Anti-Rotation Tether Kit

Shaft Sizing Insert

Mating MS Cable

Connector

Protective Basket Kit

Anti-Seize (copper)

(HS25A 0.750" only)

#2 Phillips Screwdriver

9/64" Hex Wrench

(T-Handle Style)

Caliper Gauge

Dial Indicator Gauge

7/16", 9/16", 5/8", 3/4"

Wrenches (tether options)

HS25A PART NUMBERS AND AVAILABLE OPTIONS

Mount PPR*

Line

Driver

Bore Options

Connector Op-

tions

Mounting

Style

Protection

Anti-Rotation

Tether Options

Channels

Special

Features

HS25A

5-28V

(7272)

5-28V,

open

collector

(7273)

5-28V in,

5V out

(7272)

A-

10 pin MS w/o plug

(Standard phasing)

B-

10 pin MS w/o plug

(Dynapar HS35 phasing)

C-

“A” w/ plug

D-

“B” w/ plug

W-

18" cable (pigtail)

E-

End of

Shaft

None

basket

X- None

A- Fan cover, 1/4-20

B- Fan cover, 5/16-18

C- Fan cover, 3/8-16

D- Fan cover, all

E- 4.5" or 6.75" C-Face

F- 8.5" C-Face

M- 4.5" C-Face or Fan

Cover

U- Universal

(all tether options)

A-

A,A

–

B,B

–

Z,Z

–

000-

None

9xx-

Specify

cable length

xx=feet (use w/

Option “W”)

A-1

C- 25

F- 60

G- 100

H- 120

K- 200

L- 240

M- 250

N- 256

P- 300

E- 360

Q- 500

R- 512

S- 600

T- 625

U- 720

V- 900

W-1000

Y- 1024

Z- 1200

1- 1250

2- 1440

3- 2000

4- 2048

5- 2500

6- 2540

7- 3600

Special

up to 8192 PPR available

Non-std.

A-

3/8"

B-

1/2"

C-

5/8"

D-

3/4"

(no insert)

L-

6mm

M-

8mm

N-

10mm

P-

12mm

Q-

14mm

S-

16mm

U-

Universal 3/8" to

3/4" (all inserts)

Z-

Metric 6mm to

16mm (all inserts)

X-

No Insert

Summary of content (4 pages)

PAGE 1
Encoder Instructions HS25A 8 9 0 1 E . P L E A S A N T VA L L E Y R O A D INDEPENDENCE, OHIO 44131-5508 3/8" to 3/4" [6mm-16mm] HOLLOW SHAFT T E L E P H O N E : ( 1 ) 2 1 6 - 6 4 2 - 1 2 3 0 • FA X : ( 1 ) 2 1 6 - 6 4 2 - 6 0 3 7 E - M A I L : t a c h s @ a v t r o n . c o m • W E B : w w w. a v t r o n e n c o d e r s .
PAGE 2
surface. DO NOT FORCE. Encoder should slide on easily. If the encoder does not fit easily, remove it, verify shaft size, and check for burrs and shaft damage. 7) Special Note for 0.75" shaft in HS25A ONLY: Remove encoder, apply anti-seize compound to shaft and reinstall encoder, leaving a minimum of 1/8" between motor face and encoder (see “Shaft Engagement”). 8) Apply thread locker to screw on clamping collar.
PAGE 3
under corrective installation as needed to reverse the direction of output or purchase HS35M with reverse (Dynapar HS35) phasing (options “B”, “D”). WIRING INSTRUCTIONS Be sure to remove power before wiring the HS25A Encoder. Be sure to ground the cable shield(s): It can be connected to case ground at the encoder, or grounded at the receiving device, but should not be grounded on both ends. If necessary, case ground can also be provided through aseparate wire.
PAGE 4
OUTLINE DRAWINGS 18.00 [457.20] MIN CONNECTOR OPTION “C” &”D” CONNECTOR OPTION “W” 6-32 x 0.31 DEEP ON 2.00 B.C. (4 QTY.) CONNECTOR OPTION “A” & “B” 0.86 [21.84] 2.27 [57.66] 1.30 [33.02] 1.75 [44.45] 45° 1.62 [41.15] HOLLOW SHAFT INSERT 0.53 2.40 [60.96] 0.75 [19.05] [13.46] 4.19 [106.43] 0.30 [7.62] 2.30 [58.42] MOTOR HOUSING MOUNT INSULATING FLAT WASHER INSULATING SHOULDER WASHER LOCK WASHER INSULATING WASHER DETAIL FIBER SHOULDER WASHER FIBER FLAT WASHER STEEL FLAT WASHER BOLT 6.