Mitsubishi HD-5000A Specifiche Scaricare il pdf (Pagina 59)

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Size 25 encoders (2.5" diameter) are among the most popular

encoders in the world. As a result, nearly every encoder

manufacturer in the world makes them. The problem is, not

every Size 25 encoder is built to the same exacting standards

of quality and reliability as the Model 725 Accu-Coder™ from

Encoder Products Company (EPC).

So, what's the problem? If you have used other Size 25

encoders, you have probably experienced reliability problems

such as sensor crashes and disk breakage. The typical

construction of a Size 25 encoder uses a single set of closely

spaced shaft bearings and a large diameter (typically 2.0")

glass disk mounted to the shaft. The glass disk is generally

supported on the shaft hub by just 15% of the surface area

and has a thickness of 0.030". In addition, these units

commonly require a relatively narrow air gap (typically

0.002") between the disk and sensor in order to properly

calibrate the signal. Because of this combination, a small

amount of side loading (force from installation requirements,

vibration, shock, or other conditions) to move the shaft

enough for the attached disk to make contact with the sensor

or some other portion of the stationary PCB. The result is

damage to the disk or sensor, or even disk breakage.

Then, what's the solution? When design engineers at EPC

set out to design a better Size 25 encoder, their goal was to

solve the typical problems without affecting the price of the

encoder. The result is the Model 725N, a Size 25 encoder

worthy of the Accu-Coder™ name. The first goal was to

make it more difficult for shaft movement from side load to

cause damage. Using EPC's advanced sensor technology, the

air gap between the disk and sensor doubled from 0.002"

to 0.004", and the disk diameter was reduced from 2.0" to

1.3". The next goal was to increase the durability of the disk

itself. Disk thickness was more than doubled (from 0.030" to

0.062"), manufactured using EPC's proprietary process, and

supported by 30% of the disk surface area. Finally, it was time

to improve the resistance to side load movement altogether,

so the 725N was given dual heavy-duty bearings, generously

spaced to disperse the load over a larger portion of the shaft.

But EPC's innovative engineering team wasn't satisfied.

They really wanted to solve the problems of a truly rough

environment. What they designed was the Model 725I

with the industrial 725 housing option. An encoder that is

as robust as possible within its price category. Using the

improvements developed in the 725N, EPC's engineering

team developed the "encoder-within-an-encoder" design.

With this design, the 725I adds two extra, heavy-duty

bearings to the two contained within the internal encoder

for a total of four bearings. These two extra bearing sets

are separated in such a way that side load stresses become

isolated between the two bearing sets and never reach the

inner encoder. In addition, the internal encoder is mounted

to the 725I's housing using EPC's pioneering flex mount,

further isolating the internal optics and electronics from

outside forces.

For specification assistance call

Customer Service at

Model 725n

A Step Above the Rest

Side Load

Ø1.300

Gap(0.004")

Sensor

Disk Thickness

(0.062")

Disk Support

(30% of Area)

Bearing Spacing

to Increase

Shaft Support



EPC has designed out the common problems experienced

by the average Size 25 encoder. Notice the generous air gap

(double that of typical Size 25 encoders), thick code disk

(more than twice the thickness), small diameter, large disk

support area, and large bearing spacing—each an element

which increases durability and reliability.

Side Load

Flex mount

Attached Internally

to 725I Hub

Self Contained

Unit With internal

Bearings.

Ø1.300

Gap(0.004")

Sensor

Disk Thickness

(0.062")

Disk Support

(30% of Area)

Bearing Spacing

to Increase

Shaft Support



The design improvements made in the Model 725N,

places them in their own internal encoder housing, and

surrounds the internal unit with a second, rugged housing

with a separate set of heavy duty bearings, all for an

encoder that excels in applications where other encoders

don't quite measure up.

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