How is an absolute encoder connected to an inverter?

Very many people are currently usingconverterexternalAbsolute EncoderThe frequency is simple to set, easy to operate and control, just gently rotate the external connector.Absolute Encoderknob, you can set the frequency, so do you know how the absolute encoder with theconverterConnection? Frequency converter external absolute encoder use what are the places to pay attention to? Due to a variety of inverter instructions on the external absolute value encoder resistance and power regulations are different, so we should operate inverter how to external absolute value encoder, should be in accordance with the instruction manual of the inverter to operate.

Absolute encoder principle

Absolute encoder is a resistive element with three lead pins whose resistance value can be adjusted according to a certain pattern of change. Waterproof encoder is a signal or data preparation is converted into a usable form of communication, transmission and storage equipment, the angular displacement or linear displacement into an electrical signal, the former is called the code disk, the latter is called the code ruler. Encoder signal outputs include sine wave, square wave, open collector, push-pull, and many other forms. Absolute encoders usually consist of a resistor body and movable brushes. When the brush moves along the resistor body, a resistance value or voltage is obtained at the output in relation to the displacement.

How is an absolute encoder connected to an inverter?

First of all inverter and external absolute value encoder wiring between should be recommended to use shielded wire, inverter and external absolute value encoder between the distance between the best not recommended more than 2 meters, more than 2 meters to consider the quality of its shielded wire, wire diameter between the thickness can not be small. Inverter road pressure drop can be ignored, if the pressure drop is too large, can be used with a single-core copper wire shielding instead of sound shielding line. Then the inverter analog (definition: the virtual of the real thing or process) volume input is set to the operating frequency), followed by its regulator can be converted to 4-20mA signal, sent to the signal input of the inverter, so that you can achieve the purpose of controlling the frequency conversion, at this time, the inverter frequency setting can be set by the external frequency absolute value encoder. Finally, the sliding end of the external absolute value encoder is connected to the AVI of the voltage input of the frequency converter, and the remaining two ends are connected to +10V and the common terminal.

In addition, theoretically, the absolute value encoder can also control two inverters at the same time, but in order to reduce the operating error, it is best to use two current output digital signal to the absolute value encoder to control, first set a current value (or frequency value of the inverter) to the absolute value encoder corresponding to the output of the two same current value, so as to achieve the purpose of simultaneous control of the two sets of inverter. At this time, it is better to change the frequency converter to current signal control.

Precautions for the use of external absolute encoders for frequency converters

1. The resistance value of the absolute value encoder should not be too large, which will lead to the deterioration of the absolute value encoder's anti-jamming ability when controlling the frequency converter at a long distance.

2. External absolute encoder in the work process adjustment more frequently, the absolute value encoder operating power should not be too small, generally recommended by the actual loss of power 5 to 10 times to come up to choose.

3. As a result of the consideration of its inverter internal circuitry to match each other and other issues (Emerson), the choice of absolute encoder resistance value is generally best not greater than more than 10KΩ. incremental encoder each position corresponds to a certain digital code, so its value is only related to the measurement of the start and end position, and the measurement of the intermediate process has nothing to do.

4. In the case of not understanding the internal circuit of the frequency converter, the absolute value encoder resistance adjustment should not be suitable to adjust too small, because the resistance value is small, then, will lead to increase the frequency converter internal control power supply click, so should pay attention to this point. Absolute value encoder wholesale from the single-turn absolute value encoder to multi-turn absolute value encoder, absolute value rotary single-turn absolute value encoder, in order to rotate in the measurement of the photoelectric code disk each channel engraved line, in order to obtain a unique code, when rotating more than 360 degrees, the code and return to the origin, so that does not comply with the principle of the absolute code is unique, such a code can only be used for the measurement of the rotational range of 360 degrees or less, known as the single-turn absolute value Encoder.