About encoder output signals

Rotary encoder is used to measure the speed of the device, everyone in the actual operation of the application process, will come into contact with the rotary encoder output signal type, I do not know whether you know these types? Today to popularize (refers to all over, throughout the general) under this knowledge.

The general encoder output signal in addition to the two phases A and B, each revolution also outputs a zero pulse Z. SSI signal conversion display is suitable for all kinds of winch, screw starter gate lifting height measurement.

When the spindle rotates in clockwise direction, the pulse is output according to the following figure, and the A channel signal is located before the B channel; when the spindle rotates counterclockwise, the A channel signal is located after the B channel. Thus, it can be judged whether the spindle is rotating positively or negatively.

Rotary Encoder Zero Signal

The encoder sends out one pulse per week of rotation, called the zero or mark pulse, which is used to determine the zero or mark position. To measure the zero pulse accurately, the zero pulse is output as a high combination of the two channels, regardless of the direction of rotation. Due to the phase difference between the channels, the zero pulse is only half the length of the pulse.

Rotary encoder warning signals

Some encoders also have alarm signal outputs, which can alarm power failures and light-emitting diode failures so that users can replace the encoder in time.

NPN/PNP open collector output is the most basic output method method, poor anti-interference ability, output effective distance is short. Encoder installation installed after the reduction gear, such as the shaft end of the winch wire rope reel or the last section of the reduction gear shaft end, this method has no gear to and from the return gap, the measurement is more direct, higher accuracy, this method is generally measured in long-distance localization, such as a variety of lifting equipment, feeding trolleys positioning and so on. In the rotary encoder for incremental encoder output, now less used.