Rotary Encoders - Operation Principles
         
Main Features Encoders Types
Output Signal Types
 Model Coding
Important Notes
                

Main Features

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Rotary encoders are used to measure the rotary motion and measurement of linear movements in conjunction with standard measuring equipment such as bandages spindles. Application areas include electrical drives, Machine tools, printing presses, woodworking machines, robots and handling devices.

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Rotary encoders convert rotary motion into electrical signals through fotoelemenata that scans the circular notch. The measured signals are processed or NC control and PLC machines or simply displayed. Because of its broad range of mechanical and electrical characteristics of this program we offer that proper encoders for almost any application - from simple tasks to display dynamic control of electric drives.

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When ordering a rotary encoder is necessary to know the code, output type, number of pulses per revolution, the power supply, the shape of the output signal and do not ignore, please either mounting dimensions. If you have any special requirements please note them.

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Number of output pulses per revolution is calculated by the following formula:

 

Pulses per revolution (p/r) ratio displacement per revolution encoder ((length, angle) / resolution
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Encoders Types

TYPE

I (incremental)

A (absolute)

SHAFT

S:

full

H:

hollow

C:

narrow axis

N:

no axis

FEATURES

C:

general type

H:

vibration resistant

M:

manual

F:

EX

T:

Wide temperature range

A:

Hole-in encoder, without shaft

 

L:

Flange

R:

High frequency

N:

 

 

W:

Sinus

S:

Sealed

U:

U, V, W type
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Output Signal Types

Output Types

Code

Output driver

Waveform

Open Collector

NPN

C

The same output format as the variant F, except that the load is between output and power supply (Vcc)

Push Pull

F

Voltage output

E

Line driver

 

UVW phases to measure the position of the magnetic poles of the motor

UVW

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Model Coding

1

Encoder series (Example ISC)

2

Encoder body diameter (Example 38 mm)

3

Encoder shaft diameter (Example 6 mm)

4

Constructional code

5

 

Encoder connection

C:

Side connector

H:

Back connector

G:

Side cable

E :

Back cable

J:

Square side connector

T:

Square back connector

6

The number of pulses per round (Example 1024)

7

 

Output signal

A:

A signal

AL:

A i Z signal

AZ:

A i Z signal

B:

A i B signal

BL:

A, B i Z signal

AZ:

A, B i Z signal

8

Width of the reference signal Z. No number no Z signal, 1: TZ=1T, 2: TZ=1/2T, 3: TZ=1/4T, 

9

 

Power supplay

5

5 VDC

5-12

5~12 VDC

12-24

12~24 VDC

10

Output Type

C:

Open collector NPN

F:

Push pull

E:

Voltage output (PNP)

L:

Line driver AM26LS31

H:

Line driver MC3487

D:

Line driver MC3487

T:

Line driver 26ET31B
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Important Notes

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Rotary encoders are highly sensitive precision devices, and should not be exposed to shocks. Unsuitable or wrong installation can affect the ability and durability.

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Rotary encoders are connected with flexible couplings, nylon gear and synchronous belt transmission to avoid damage to the drive shaft and due to vibration and shaking.

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Check that the difference between the end user and encoder end <0.2 mm, and the angle of each axis <1.5

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Check that the load has not exceeded the max value of the load

 

Make sure not to exceed the limit speed of rotation, if exceeded electrical signals may be lost. Limit rated speed under normal operating conditions is given by the equation:

 

 

where F is the frequency response and L is the number of grid networks

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Check the wiring diagram given on the product. Incorrect connection can damage the rotary encoder internal circuitry.

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Never place the power cable and the signal cable in the same tube (channel). Do not use the rotary encoder in addition to the energy system wiring to avoid interference.
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