German NORD encoder NORD model NORD price

NORD encoders are used to measure physical quantities such as speed, position, velocity, or angle bai. They are sensors that convert mechanical displacement du into electrical signals zhi, and are divided into incremental and absolute types. Incremental encoders generate pulse signals, and the number of pulses can be used to measure speed, length, or position. For absolute encoders, each position corresponds to a digital value of displacement. Inside the encoder, there is a rotating disk (code disk) with several transparent and opaque windows. Photoelectric receivers collect intermittent light beams, thereby converting light pulses into electrical pulses, which are then processed and output by electronic output circuits.

NORD Encoder Classification

According to working principle, encoders can be divided into incremental and absolute types. An incremental encoder converts displacement into a periodic electrical signal, which is then converted into counting pulses; the number of pulses indicates the magnitude of displacement. Each position of an absolute encoder corresponds to a specific digital code, so its reading depends only on the start and end positions of the measurement, not on the intermediate process. A rotary incremental encoder outputs pulses during rotation, and its position is determined by counting equipment. When the encoder is stationary or power is lost, the position is retained by the internal memory of the counting device. Therefore, after a power loss, the encoder must not move; furthermore, pulses must not be lost due to interference during pulse output when power is restored, otherwise the zero point remembered by the counting device will shift. The amount of this shift is unknown and can only be detected when erroneous production results occur. The solution is to add a reference point; each time the encoder passes the reference point, the reference position is corrected in the memory of the counting device. Before the reference point, position accuracy cannot be guaranteed. For this reason, in industrial control, methods such as finding the reference point before each operation and homing at startup are used. For example, the positioning of printers and scanners uses the principle of incremental encoders; each time they are powered on, we hear a series of clicking sounds as they search for the reference zero point before starting work.

NORD Encoder Categories

An absolute encoder is a sensor that directly outputs digital quantities. On its circular code disk, there are several concentric code tracks along the radial direction. Each track consists of alternating transparent and opaque sector-shaped areas. The number of sectors in adjacent tracks has a double relationship. The number of code tracks on the disk corresponds to the number of bits in its binary code. On one side of the disk is a light source, and on the other side, there is a photosensitive element corresponding to each code track. When the code disk is in different positions, each photosensitive element converts the presence or absence of light into corresponding level signals, forming a binary number. The characteristic of this encoder is that it does not require a counter; a fixed digital code corresponding to the position can be read at any position of the rotating shaft. Obviously, the more code tracks there are, the higher the resolution. For an encoder with N-bit binary resolution, its code disk must have N code tracks. Absolute encoders use natural binary or cyclic binary (Gray code) methods for photoelectric conversion. The difference between absolute encoders and incremental encoders lies in the transparent and opaque line patterns on the disk. Absolute encoders can have several codes, and the absolute position is detected by reading the codes on the disk. Code design can adopt binary code, cyclic code, two's complement binary code, etc. Its characteristics are: 1.2.1 the absolute value of the angular coordinate can be read directly; 1.2.2 there is no cumulative error; 1.2.3 position information is not lost after power cutoff. However, the resolution is determined by the number of binary bits, meaning accuracy depends on the number of bits. Currently, there are various types such as 10-bit and 14-bit.

NORD Encoder Troubleshooting

Encoder internal fault: This refers to a failure of the encoder's own components, causing it to fail to generate and output correct waveforms. In this case, the encoder needs to be replaced or its internal components repaired. Encoder connection cable fault: This fault occurs most frequently and is often encountered during maintenance; it should be the primary consideration. It is usually caused by open circuits, short circuits, 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 loose cable fixing causes loosening, leading to open solder joints or open circuits; in this case, the cable needs to be clamped tightly. Encoder +5V power supply drop: This refers to the +5V power supply being too low, typically not lower than 4.75V. The cause of the low voltage is usually a power supply fault or excessive resistance in the power transmission cable causing loss. In this case, the power supply needs to be repaired or the cable replaced. Absolute encoder battery voltage drop: This fault usually triggers a clear alarm. In this case, the battery needs to be replaced. If the reference point position memory is lost, the return-to-reference-point operation must be performed. Encoder cable shield wire not connected or detached: This introduces interference signals, making the waveform unstable and affecting communication accuracy. Reliable welding and grounding of the shield wire must be ensured. Loose encoder installation: This fault affects position control accuracy, causing excessive position deviation during stopping and movement, or even triggering servo system overload alarms immediately upon startup. Please pay special attention. Grating contamination: This reduces the signal output amplitude. Oil stains must be gently wiped off with degreasing cotton soaked in anhydrous alcohol.

Weidou Intelligent Technology specializes in selling German NORD rotary encoders, NORD incremental encoders, NORD absolute encoders, NORD optical encoders, NORD magnetic encoders, NORD shafted encoders, NORD hollow shaft encoders, NORD contact brush encoders, NORD angle encoders, NORD linear encoders, NORD digital encoders, NORD draw-wire encoders, NORD position encoders, NORD hollow bore encoders, NORD spindle encoders. All are original imports from Germany. Customers are welcome to inquire and order.