An encoder is a device that converts angular or linear displacement into an electrical signal. The former becomes the yardstick, and the latter is called the yardstick. According to the readout method, the encoder can be divided into two types: touch type and non-touch type. The touch type selects the brush output, and a brush touches the conductive area or the insulation area to indicate that the status of the code is "1" or "0"; The non-touch receiving sensitive element is a photosensitive element or a magnetic sensitive element, and when selecting a photosensitive element, the light transmission area and the opaque area indicate whether the status of the code is "1" or "0".
According to the operating principle, the encoder can be divided into two categories: incremental and **.
It is a rotary sensor that converts rotational displacement into a series of digital pulse signals
These pulses can be used to manipulate angular displacements and, if the encoder is combined with a gear bar or spiral lead screw, can also be used to measure linear displacements.
After the encoder generates an electrical signal, it is processed by a digital control CNC, a programmable logic manipulator PLC, and a control system. These sensors are mainly used in machine tools, data processing, electric motor feedback systems, and measuring and control equipment. In the ELTRA encoder, the principle of photoelectric scanning is used for the conversion of angular displacements. The reading system is based on the rotation of the radial indexing dial, which consists of alternating translucent and opaque windows. The system is all irradiated vertically with an infrared light source, so that the light projects a picture on the plate onto the surface of the receiver, which is covered with a grating called a collimator, which has the same window as the disc. The receiver's job is to sense the light changes that occur when the disc rolls, and then convert the light changes into the corresponding electrical changes. In general, a rotary encoder can also obtain a speed signal, which is fed back to the inverter to condition the output data of the inverter. Fault phenomenon: 1. When the rotary encoder is bad (no output), the inverter cannot operate normally, and the running speed becomes very slow, and the inverter is maintained for a while, showing "PG disconnection"... Joint action talent works. In order for the electrical signal to rise to a higher level and a square wave pulse to occur without any interference, it is necessary to use electronic circuits to handle it. It is necessary to correspond to the type of encoder PG between the encoder PG wiring and the parameter vector inverter and the encoder PG. Generally speaking, the encoder PG type is divided into three types: differential output, open collector output and push-pull output, and the signal transmission mode needs to take into account the interface of the inverter PG card, so the appropriate PG card type or setting is reasonable.
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