SE22 Small Encoder

Data Sheet

5V power supply

single ended output

optical model

Description

SE22 is an high performance, low cost, hollow shaft encoder, very easy to assembly on shaft with diameter

ranging from 1.5 mm to 8.0 mm.

According to the model, the device provides one or two (or two plus index) incremental encoding square

wave signals outputs. The device is very suitable for speed and incremental position detection on the

applications requiring high reliability, very good performances, easy and fast assembly and a good

performance/price ratio. The encoder is available with several resolutions, shaft diameters and output

circuits. In the current data sheet the 5V power supply, single ended output, optical model is described.

The encoder is also available with 12÷24V power supply and differential output (line-driver); for aggressive

environments a magnetic model is going to be developed (refer to www.vemtech.it web site for updated

news.

VEM tech Scrl – V. A. Diaz, 4 37105 Domegliara (VR) ITALY, www.vemtech.it – Manual rev. 1.4, date Dec. 9th

2011 page 2/8

Dimensions (mm)

Encoder

Resolution (CPR)

Motor Shaft

Ø Diameter (mm)

001

002

004

008

050

064

100

120

128

150

160

200

250

256

300

1.50

2.00

2.30

2.50

3.00

3.175 (1/8”)

4.00

5.00

5.80

6.00

6.35 (1/4”)

8.00

Features

√ Dimensions: 22.6 mm diameter, 21.0 mm height.

√ Quick and easy assembly without touching sensitive components

√ Output channels: 2 (quadrature) + 1 optional index-channel

√ Power supply: 5 VDC (other power supply values also available)

√ Output type: TTL compatible, push-pull or open collector

√ Resolution up to 300 CPR (Counts Per Rotation)

√ No signal adjusting required

√ Maximum shaft diameter: 8.0 mm

√ Operating temperature: -20 °C to +85 °C

√ Frequency: up to 60 kHz

√ RoHS compliant

Absolute Maximum Ratings

Parameters Symbol Min. Typ. Max. Unit Notes

Storage Temperature T s -40 85 °C

Operating Temperature T A -20 85 °C

Humidity Exposure 90 % RH not condensing

Supply Voltage Vcc -0.5 7 V

Output Voltage Vout -0.5 Vcc V pull-up & push-pull versions

Output Current per channel I out -1.0 8 mA open collector version

Vibration 2000 Hz 200 m/s² RSM

VEM tech Scrl – V. A. Diaz, 4 37105 Domegliara (VR) ITALY, www.vemtech.it – Manual rev. 1.4, date Dec. 9th

2011 page 3/8

Operating Conditions

Electrical characteristics are effective in the range of the typical operating values at 25 °C and VCC = 5 V.

Parameters Symbol Min. Typ. Max. Unit Notes

Operating Temperature TA -20 25 85 °C

Supply Voltage Vcc 4.5 5.0 5.5 V

Supply Current (pull-up, open collector) I cc 20 40 mA

Supply Current (push-pull version) I cc 150 mA

Load Capacitance C L 100 pF

Output Frequency f 30 60 kHz RPM x CPR / 60 x 10-3

A, B & Index channels

High Level Output Voltage (TTL version) VoH 2.4 Vcc V I oH = -0.2 mA ;Vcc =5V

Low Level Output Voltage (TTL version) VoL 0.4 V I oL = 8.0 mA

Rise Time (TTL version) t r 800/(5)* ns/(µs)* C L = 25 pF

Fall Time (TTL version) t f 800/(1)* ns/(µs)* C L = 25 pF

High Level Output Voltage (push-pull) VoH 3.8 V I oH = -32 mA

Low Level Output Voltage (push-pull) VoL 0.55 V I oL = 32 mA

Rise Time (push-pull version) t r 50 ns CL = 25 pF; RL = 500 ohm

Fall Time (push-pull version) t f 50 ns CL = 25 pF; RL = 500 ohm

Max collector voltage (open collector) Vc 30 V

Max collector current (open collector) I c 50 mA

High Level Output Volt. (open collector) VoH Vc V IoH=-0.2 mA

Low Level Output Volt. (open collector) VoL 0.4 V IoL=7mA

Rise Time (open collector version) t r 5 µs CL = 25 pF

Fall Time (open collector version) t f 1 µs CL = 25 pF

For open collector:

Rc=3K3 Ω; Vc=24 V

(*) only for 1, 2, 4, 8 CPR and index channel

Parameter Symbo Nominal Max. Unit

Pulse Width ΔP 16 75 °e

Phase Error Δφ 12 60 °e

Position Error ΔQ 0 1.3 °m

Definitions of terms

Counts per Rotation (CPR): The number of bar and

window pairs or encoder increments per revolution.

One Cycle (C): 360 electrical degrees (°e), one period of

the signal, caused by one pair of bar and window.

Pulse Width (P): The number of electrical degrees with

output high in one cycle; this nominal value is 180 °e.

Pulse Width Error (ΔP): The deviation of pulse width, in

electrical degree, from its ideal value of 180 °e.

State Width (S): The number of electrical degrees

between a transition in the output of channel A and the

closer transition in the output of channel B. There are 4

states per cycle, each nominally 90 °e.

Phase (Φ): The number of electrical degrees between

the centre of the high state of channel A and the center

of the high state of channel B, the nominal value is 90 °e.

Phase Error (ΔΦ): The deviation of phase, in electrical

degree, from its ideal value of 90 °e.

Position Error (ΔQ): The angular difference between the

actual angular shaft position and the position indicated

by the encoder cycle count.

VEM tech Scrl – V. A. Diaz, 4 37105 Domegliara (VR) ITALY, www.vemtech.it – Manual rev. 1.4, date Dec. 9th

2011 page 4/8

Electrical interface Encoder flange

Mechanical notes

Parameter Value Tolerance Unit

Dimensions Ø 22,6 x 21,0 ref. mm

Required shaft length SL (*) 9.5 ±1.0 mm

Max. axial shaft play 0.4 - mm

Max. radial shaft play 0.025 - mm

Tightening screw torque 15 ref. N*cm

Screws wheelbase 17.0 ±1.0 mm

Mounting boss diameter BD (*) 11.0 +0 / -0.03 mm

Mounting boss height BH (*) 2.5 Max -0.1 mm

Mating connector (Molex) contact 5x 50079-8000

housing 1x 51021-0500

Total weight 8.5 ref. g

Protection grade (according to DIN 40500) IP40 - -

Shaft diameter SD (* i.e. see below picture) ±0.01 mm

- -

1.50, 2.00, 2.30, 2.50,

3.00, 3.175(1/8”), 4.00,

5.00, 5.80, 6.00, 6.35

(1/4”), 8.00

VEM tech Scrl – V. A. Diaz, 4 37105 Domegliara (VR) ITALY, www.vemtech.it – Manual rev. 1.4, date Dec. 9th

2011 page 5/8

Ordering information

Ordering code:

SE 22 RRR DDD X COO S

Encoder

resolution

(CPR)

Motor shaft

diameter

(hundredth of

mm)

Number of

channels

Output

option

Model

001 150 1 = 1 channel CPU = TTL interface S = optical

5V, single

ended

002 200 2 = 2 channels CPP = push-pull 004 230 3 = 3 channels COC = open collector 008 250 050 (note *1) 300 064 (note *1) 317 (1/8”) 100 400

120 500 150 580

160 600 200 635 (1/4”)

250 800 256 300

Notes

Note *1: one channel output only

Other encoder resolutions on request

EXAMPLE OF ORDERING CODE: SE22-100-250-2-CPU-S

Available accessories (no parts of standard delivery):

√ cable 300 mm length (UL1061 / AWG28)

√ adapter plates for different motors

√ centering gauge for different motor shafts

√ fastening screws DIN 84 M1.6x6 mm

√ fastening screws DIN 84 M1.6x7 mm

√ self-tapping screws for plastic KA18x8 mm.

VEM tech Scrl – V. A. Diaz, 4 37105 Domegliara (VR) ITALY, www.vemtech.it – Manual rev. 1.4, date Dec. 9th

2011 page 6/8

ASSEMBLING INSTRUCTIONS

1

For good encoder performaces the base plate hole

MUST be concentric to the shaft. This assembly

operation is easier by using the “centering gauge”.

3

2

The base plate should be fixed to the flange by using

the accessory screws.

4

Align the housing to the base plate (the black arrow

on the label to be aligned with one of the two snap

fasteners on the flange), move the housing towards

the base plate and the hub centers itself on the

motor shaft.

Press the housing into the final position.

The encoder is now ready for use.

VEM tech Scrl – V. A. Diaz, 4 37105 Domegliara (VR) ITALY, www.vemtech.it – Manual rev. 1.4, date Dec. 9th

2011 page 7/8

Assembly remarks:

The encoder could be assembled using a mounting boss. Shaft diameters, shaft lenght and tolerances are showed in the

previous tables. FOR ENSURING THE DECLARED ENCODER SIGNAL PERFORMANCES, THE ENCODER BASE PLATE MUST BE

ASSEMBLED CONCENTRIC TO THE SHAFT.

ACCESSORIES

Standard cable length 300 mm (UL1061/AWG28).

Other cables (shielded also) are available on

request.

Centering gauge: to ensure the concentricity

between the encoder base plate and the shaft.

Customized adapter plate

Screws DIN84 M1.6x6 mm

Screws DIN84 M1.6x7 mm

Self-tapping screws for plastic KA18x8 mm

VEM tech Scrl – V. A. Diaz, 4 37105 Domegliara (VR) ITALY, www.vemtech.it – Manual rev. 1.4, date Dec. 9th

2011 page 8/8

IMPORTANT NOTICE

The encoder is so designed that it may be assembled only one time, otherwise the guarantee will be

voided. The guarantee will be voided by misuse, accident, modification, unsuitable physical or

operating environment, operation in an operating environment out of specs, or by a failure caused

by a product for which VEM tech Scrl. is not responsible.

ESD warning: standard handling precautions to be taken to avoid static discharge damage to the device.

VEM tech Scrl reserves the right to make corrections, modifications, enhancements,

improvements, and other changes to its products and services also datasheets at any time.

VEM tech scrl

Via A. Diaz, 4 - 37015 Domegliara

S. Ambrogio di Valpolicella (VR), Italy

Tel. +39 045 6888869 - Fax +39 045 6884198

http://www.vemtech.it

info@vemtech.it

Skype: vemtech.italia