Installation method of Italian Eltra encoders

Brand

ELTRA/Italy

Origin Category

Imported

Application Areas

Energy, Electronics/Batteries, Packaging/Paper/Printing, Textiles/Dyeing, Electrical

An Eltra encoder is a device that encodes signals (such as bitstreams) or data into a signal form that can be used for communication, transmission, and storage. Encoders convert angular or linear displacement into electrical signals; the former is called a code disk, and the latter a code scale. Encoders can be classified into contact and non-contact types according to their readout method; and into incremental and absolute types according to their working principle. Incremental encoders convert displacement into periodic electrical signals, then convert these signals into counting pulses, using the number of pulses to represent the magnitude of the displacement. Absolute encoders assign a specific digital code to each position; therefore, their reading depends only on the starting and ending positions of the measurement, and is independent of the intermediate steps.

Eltra Encoder Selection Considerations:

Three key parameters for Eltra encoders:

1. Mechanical Mounting Dimensions: Including positioning stops, shaft diameter, mounting hole positions; cable exit method; installation space volume; and whether the environmental protection level meets requirements.

2. Resolution: The number of pulses output per revolution of the encoder, and whether it meets the design accuracy requirements.

3. Electrical Interface: Common encoder output methods include push-pull output (F-type HTL format), voltage output (E), open collector (C, commonly C is NPN type transistor output, C2 is PNP type transistor output), and long-line driver output. The output method should match the interface circuit of its control system.

Common Eltra Encoder Advantages and Disadvantages:

Photoelectric Encoder (Folded)

Advantages: Small size, high precision, inherently high resolution, non-contact and wear-free; the same type can detect both angular displacement and linear displacement with the assistance of a mechanical conversion device; multi-turn photoelectric absolute encoders can detect linear displacement over a considerable range (e.g., 25-bit multi-turn). Long lifespan, flexible installation, rich interface options, and reasonable price. Mature technology, widely used both domestically and internationally for many years.

Disadvantages: Precision, but requires high protection in outdoor and harsh environments; linear displacement measurement relies on mechanical conversion, necessitating the elimination of errors caused by mechanical backlash; difficulty in overcoming slippage when detecting objects moving on tracks.

Static Magnetic Grating Absolute Encoder (Folded)

Advantages: Moderate size, direct measurement of linear displacement, absolute digital encoding, theoretically unlimited range; non-contact and wear-free, resistant to harsh environments, usable underwater up to 1000 meters; diverse interface options, various measurement methods; acceptable price.

Disadvantages: Resolution of 1mm is not high; different types are required for measuring straight lines and angles; not suitable for displacement detection in small areas (greater than 260 mm).

Eltra Encoders

In Stock:

EL40A2048Z5/28P6X3PR2.004C

EL40A2048Z5/28P6X6PR2.004C

EL40A2048Z5/30L6X6PR2.004C

EL40A2048Z5/30P6X6PR2.004C

EL40A20S5/28P6X6PR249

EL40A20S8/24P6X3PR5.796

EL40A250S5/28P6X6PR.249

EL40A250S5/28P6X6PR249

EL40A2S5/28P6X3PR3

EL40A360Z5/28P6X3PR.578 EL40A360Z5/28P6X6PR.578

EL40A500S5/28P6X6PR.249

EL40A500Z8/246X6PR.2

EL40A50S5/28P6X6PR249

EL40A50S8/24P6X3PR5.796

EL40A6000S5/28P6X6PR2

EL40A600S5/28P6S3PR2

EL40A600S5/28P6SX6PR2

EL40A600Z5/28C6X6PR.578

EL40A600Z5/28P6X6PR

Eltra Encoder Installation Method:

High-speed end mounting: Installed on the end of the motor shaft (or gear connection). The advantage of this method is high resolution. Since multi-turn encoders have 4096 rotations, the motor's rotation count falls within this range, fully utilizing the range to improve resolution. The disadvantage is that there is gear backlash error during the return stroke after the moving object passes through the reduction gear. It is generally used for unidirectional high-precision control and positioning, such as roll gap control in steel rolling. Additionally, when the encoder is directly installed at the high-speed end, motor vibration must be minimal, otherwise the encoder may be damaged.

Low-speed end mounting: Installed after the reduction gear, such as on the shaft end of a hoisting wire rope drum or the last reduction gear shaft. This method eliminates gear backlash, making measurement more direct and accurate. This method is generally used for long-distance positioning, such as various lifting equipment and feeding trolley positioning.

Auxiliary mechanical mounting:

Commonly used methods include gear and rack systems, chain belts, friction pulleys, and rope winding mechanisms.

Working Principle (Folded Edit Section)

The encoder consists of a centrally located photoelectric code disk with circular, alternating light and dark markings.

Photoelectric transmitters and receivers read these markings, obtaining four sets of sinusoidal signals, A, B, C, and D. Each sinusoidal wave is 90 degrees out of phase (360 degrees per cycle). The C and D signals are inverted and superimposed on the A and B phases to enhance signal stability. Additionally, a Z-phase pulse is output per revolution to represent the zero-position reference.

Since the A and B phases are 90 degrees out of phase, the encoder's forward and reverse rotation can be determined by comparing whether phase A or phase B leads. The zero-position reference position of the encoder can be obtained through the zero-position pulse. Encoder code disks are made of glass, metal, or plastic. Glass code disks have very thin etched lines deposited on glass, offering good thermal stability and high precision. Metal code disks have lines directly etched with both through and dark areas, making them less fragile. However, due to the thickness of the metal, precision is limited, and their thermal stability is an order of magnitude lower than glass. Plastic code disks are economical, with low cost, but their precision, thermal stability, and lifespan are all somewhat inferior.

Resolution – The encoder's resolution is measured by the number of through or dark etched lines provided per 360 degrees of rotation. It is also called resolution scale or simply the number of lines, typically ranging from 5 to 10,000 lines per revolution.

Our business scope includes:

Hydraulic components:

Solenoid directional valves, directional valves, check valves, stack valves, relief valves, counterbalancing valves, proportional valves, manual directional valves, flow valves, pressure reducing valves,

Throttle valves, pressure control valves, back pressure valves, filling valves, flow dividers, shuttle valves, pressure relays, cartridge valves, pneumatic valves, piston pumps,

Gear pumps, vane pumps, cycloidal hydraulic motors, oil coolers, hydraulic cylinders, etc.;

Pneumatic components:

Air source processor assemblies, filters, pressure regulating valves, oil feeders, solenoid valves, pneumatic valves, angle seat valves, manual valves, hand-operated valves, foot valves,

Mechanical valves, check valves, vacuum generators, cylinders, magnetic switches, shock absorbers, pressure gauges, quick couplings, floating couplings,

Pressure gauge switches, water coolers, electric positioners, PU tubing, vacuum suction cups, oil filters, vibrators;

Electrical components:

Relays, sensors, converters, proximity switches, encoders, programmable logic controllers (PLCs); The company maintains a large inventory, with standard parts readily available. To better serve customers across various industries, the company also distributes other spare parts, utilizing professional sourcing channels and offering reasonable prices.

The company's products are widely used in industrial machinery, machine tools, plastics machinery, shoe machinery, brick machinery, metallurgy, mining, chemical industry, papermaking, coal industry, shipbuilding, power generation, construction machinery, environmental protection machinery, and many other fields.