BEI Sensors MX21 Data Sheet

BEI Sensors

MX21 INSTA-MOUNT™ Series—Modular
Incremental Rotary Optical Encoder

By the time you have read this first sentence, you could have installed

cover button for motor through-shafts)

X

XXX

MX21

XXXX

X

OUTPUT FORMAT :

INDEX OPTION

*For Output Formats 3

G= gated to data A & B

ELECTRICAL TERMINATION:

XX

BORE SIZE:

PULSES PER REVOLUTION (PPR):

BEI’s model MX21 INSTA-MOUNT™ modular optical encoder. In
addition to its quick and easy installation, the MX21 is designed to
operate with jitter-free output signals without tight controls on shaft
endplay, runout, or perpendicularity. The new INSTA-MOUNT™
encoder is capable of operating within a temperature range of -10°to
+70°C, requiring less than 30 milliamps of L.E.D. current, without
degradation of output signals and is short circuit protected.

The MX21 is perfectly suited for motor manufacturers and other high
volume OEMs. BEI’s INSTA-MOUNT™ Series encoder offers 5V TTL
compatible quadrature outputs with index and complements as options.
Axial shaft movements during operation, o f±0.010", will not adversely
affect the output signals. Shaft runouts of 0.005" TIR can also be
absorbed by this device without affecting output signal performance.

Mechanical Specifications

Dimensions: See Figure 1
Weight: 2.1 oz. (Approx.)
Moment of Inertia: 2.6 x 10
Bore Size: see “Ordering Options”

Motor Interface

Mount Holes: #4-40 or M3 x 0.5 @ 180° on

1.812” dia. B.C.

Mount Hardware: 2 sockethead cap screws
Perpendicularity Shaft to M ount\: 0.002” TIR
Shaft Runout: 0.005” max (each 0.0001

degrades accuracy by 0.5 arc minutes)

Shaft Endplay Dynamic or Static: ±0.010”
Shaft Finish: 16 micro inches or better. End

must be chamfered or rounded

Shaft Tolerance: nominal -0.0002”/-0.0007”
Shaft Length: 0.56” minimum remove (remove

-5

oz in sec

2

Electrical Specifications

Code: Incremental
Pulses per revolutions (PPR): See “Ordering

Options”)

Index Pulse Options ungated index (U)
(no index on MX212) gated index (G)
Supply Voltage: 5 volts ±5% @ 80mA max.
Output Format: dual channel quadrature & index
(MX212 & 213) (no index on MX212)
(MX216) dual channel quad & index w/ comps
Output Type:
(MX212 &213): square wave TTL. 16mA sink

500ΩA source. Short circuit protected

(MX216): TTL differential line driver (26LS31 or

equiv.) should be terminated into a line receiver
(26LS32, or equivalent circuit)

Frequency Response: see graph: Fig 3
Rise Time: 1.0µ sec. max.

Environmental Specifications

Temperature:
Operating: -10°C to +70°C

Storage: -40°C to +125°C

Termination Specifications

Ribbon: 28 AWG flat ribbon cable with 10 position
connector Berg P/N 65863-165 or equiv. Mates with
Berg P/N65863-165 or equiv) (mating connector not
provided)

Round Cable: 28AWG 8 Conductor shielded cable
*NOTE: See pinout tables, back page.

MX21 Series Encoder Ordering Options: for assistance, call 800.350.2727

Use this diagram, working from left to right to construct your model number (example: MX213-38-512-G-R18)

2= Quadrature

3= Quadrature w / index

6= Quadrature w / index &

complements

25 = .25”
38 = .375”
6M = 6mm

8M = 8mm,

10M = 10mm

200, 400, 500, 512, 1000, 1 024

Tel: [phone] | Fa x: 805-968-3154 /800-960-2726 | 7230 Hollister Ave., Goleta, CA 93117-2807 | www.beiied.com

and 6 ONLY

U= ungated

Cxx = Round Shielded Ca bl e

Rxx = Ribbon Cable with 10 Pin Socket

Header

(xx = length of cable in inches; 18 inches

standard)

Specification No. 02122-001 Rev11-10