ELTRA encoder EL63A4096S5L8X3PR in stock

Brand

ELTRA/Italy

Origin Category

Imported

Application Areas

Medical & Health, Sporting & Cultural, Petroleum, Energy, Packaging/Paper/Printing

ELTRA Encoders, ELTRA Absolute Encoders, ELTRA Incremental Encoders, ELTRA Rotary Encoders, ELTRA Wire and Magnetic Encoders

ELTRA Encoders

ELTRA encoders are devices that encode and convert 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. According to the readout method, encoders can be divided into contact and non-contact types; according to the working principle, encoders can be divided into incremental and absolute types. Incremental encoders convert displacement into periodic electrical signals, and then convert these electrical signals into counting pulses, using the number of pulses to represent the magnitude of the displacement. Each position of an absolute encoder corresponds to a specific digital code; therefore, its reading depends only on the starting and ending positions of the measurement, and is independent of the intermediate process.

ELTRA Encoders - Main Classifications (Folded Edit Section)

ELTRA encoders can be classified as follows:

1. Classification by the method of engraving the code disk:

(1) Incremental type: A pulse signal is emitted for each unit angle rotated (some emit sine and cosine signals,

and then subdivided and chopped to produce higher frequency pulses). Typically, there are A-phase, B-phase, and Z-phase outputs. A-phase and B-phase outputs are pulses with a 1/4 cycle delay between each other. The delay relationship can distinguish between forward and reverse rotation. Furthermore, the rising and falling edges of A-phase and B-phase can be used for 2- or 4-fold frequency multiplication. Z-phase is a single-turn pulse, emitting one pulse per revolution.

(2) Absolute value type: For each revolution, a binary value corresponding to each reference angle is emitted. Multiple positions can be recorded and measured using an external clocking device.

2. Classification by signal output type: Voltage output, open collector output, push-pull complementary output, and long-line drive output. 3. Classification by Encoder Mechanical Mounting Form

(1) Shaft-mounted type: Shaft-mounted encoders can be further divided into clamping flange type, synchronous flange type, and servo mounting type, etc.

(2) Bushing type: Bushing type can be further divided into semi-hollow type, fully hollow type, and large diameter type, etc.

4. Classification by Encoder Working Principle: Encoders can be classified into photoelectric type, magnetoelectric type, and contact brush type.

ELTRA Encoder Common Faults (Folded Edit Section)

1. Encoder itself malfunction: This refers to a fault in the encoder's components,

causing it to fail to generate and output the correct waveform. In this case, the encoder needs to be replaced or its internal components repaired.

2. Encoder connection cable malfunction: This type of fault has the highest probability of occurrence and is frequently encountered during maintenance, so it should be the first factor to consider. It is usually caused by an open circuit, short circuit, or poor contact in the encoder cable. In this case, the cable or connector needs to be replaced. Special attention should also be paid to whether the cable is not securely fastened, causing loosening and resulting in open circuits or weld defects. In this case, the cable needs to be tightened. 3. Encoder +5V power supply drop: This refers to a +5V power supply that is too low. It should typically not fall below 4.75V. The cause of this low voltage is a power supply failure or excessive resistance in the power cable, leading to power loss. In this case, the power supply needs to be repaired or the cable replaced.

4. Absolute encoder battery voltage drop: This fault usually has a clearly defined alarm.

In this case, the battery needs to be replaced. If the reference point position memory is lost, a re-reference point operation must be performed.

5. Encoder cable shield not connected or detached: This introduces interference signals, causing waveform instability and affecting communication accuracy. Reliable soldering and grounding of the shield wire are essential.

6. Loose encoder installation: This fault affects position control accuracy, causing excessive position deviation during stopping and movement, and may even trigger a servo system overload alarm immediately upon power-on. Please pay special attention.

7. Grating contamination: This will reduce the signal output amplitude. Oil stains must be gently wiped away with a cotton swab soaked in grease.

ELTRA Encoder Installation and Use (Folded Edit Section)

Mechanical Installation and Use of ELTRA Absolute Rotary Encoders:

ELTRA absolute rotary encoders can be mechanically installed in several ways, including high-speed end installation, low-speed end installation, and installation with auxiliary mechanical devices.

High-speed end installation: Installed on the shaft end of the power motor (or gear connection). The advantage of this method is high resolution. Since multi-turn encoders have 4096 turns, the number of motor rotations is within this range, fully utilizing the range to improve resolution. The disadvantage is that there is gear backlash error in 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 minimized, otherwise the encoder may be damaged.

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

Commonly used ELTRA encoders include rack and pinion, chain and belt, friction wheel, and rope winding mechanisms.

ELTRA Encoder Working Principle:

It consists of a photoelectric code disk with a central shaft and circular, dark and light-reflecting lines.

Photoelectric transmitting and receiving devices read these lines, obtaining four sets of sine wave signals combined into A, B, C, and D. Each sine 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 direction of the encoder's rotation (forward or reverse) 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.

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