A guide of single pulse encoder wiring

In the modern world of automation and electric control, single pulse encoder plays an important role, and the correct wiring of it is one of the key steps for ensuring that they work properly.

Single pulse encoder is a common sensor device that orients the position by means of optical, magnetic or mechanical contacts and converts the position information into an electronic signal for output.

Simply, a single pulse encoder can be divided into incremental and absolute types according to different working principles. For one part, the incremental encoder converts the displacement into a periodic electrical signal, and then converts the electrical signal into a counting pulse, and the number of pulses indicates the size of the displacement. As for the other, each position of the absolute encoder corresponds to a certain digital code, so its indication value is only related to the starting and ending positions of the measurement, and has nothing to do with the middle process of the measurement.

Basic structure of single pulse encoder wiring

Before understanding how to do wiring, we need to make it clear that a single pulse encoder usually has several important lines.

First, generally speaking, a single pulse encoder includes power cables, signal cables and ground cables. The power line is the line that provides the working power supply for the encoder, and its voltage needs to meet the specifications of the encoder, which are commonly 5V or 12V and other different specifications. When wiring, ensure that the power cord is connected to a stable power supply to avoid excessive voltage fluctuations affecting the performance of the encoder.

Second, the signal line is the key line to transmit a pulse signal. The signal line of the single pulse encoder is responsible for transmitting the position or motion information detected by it in the form of pulses. When connecting a signal line, be careful to connect it to the corresponding port of the receiving device, such as a controller or counter. This is like the conversation between two people, must be on the right "channel" to understand each other, the signal transmission is the same, the wrong connection will cause the receiving device cannot correctly interpret the information from the encoder.

Third, the ground wire is the basis to ensure the stable operation of the entire system. It acts to eliminate interference and provide electrical circuits. When wiring, the ground wire of the encoder should be well connected to the public ground of the system, so that the entire circuit forms a complete loop, while avoiding the noise interference introduced by poor grounding.

Moreover, there three lines with different functions are covered with different colors, for example, the power line may be red, the ground line black, the signal line green. We can accurately perform wiring operations according to these color markers.

Preparation before single pulse encoder wiring

Before wiring, a series of preparatory work is required to ensure the smooth wiring process and the normal operation of the encoder.

1. Understand encoder specification

According to the specification or instruction manual of the single pulse encoder, determine the type of power supply required (such as DC power supply or AC power supply) and the voltage, current and other parameters. Besides, remember the wiring modes of the encoder, including the color and number of signal lines and the corresponding signal type (such as A, B signals, etc.).

2. Prepare tools and materials

3. Check encoder status

Ensure that the appearance of the single pulse encoder is not damaged, especially the photodetector and coding disk parts. Then properly install the encoder, making sure the encoder body and shaft are not machined or damaged in any way during installation.

4. Safety measure

It is necessary to read the wiring diagram of the encoder and controller carefully to make sure you know the correct connection and sequence of each cable. And before single pulse encoder wiring, power off all devices to avoid damage or personal injury caused by electrical contact. Furthermore, the encoder signal line should be separated from the power line to avoid interference.

Step-by-step guide of single pulse encoder wiring

To illustrate the wiring process simpler, we can see the example below.

Suppose we have a common single pulse encoder whose interface has 5 pins, labeled as: VCC (positive power supply, assumed to be 5V), GND (ground), phase A pulse output signal line, phase B pulse output signal line (in some single pulse encoder applications may be used for direction determination, etc.), and phase Z pulse output signal line (usually a zero pulse signal).

We have a controller connected to it, and the controller has a corresponding power input interface, a ground interface and an input interface specifically for receiving pulse signals.

First, connect the VCC pin of the encoder, such as the red wire, to the 5V power output pin of the controller. This step ensures that the encoder has a normal working power supply.

Second, connect the GND pin of the encoder (for example, the black wire) to the ground pin of the controller. This establishes a common electrical reference point and prevents electrical noise interference.

Third, we come to a signal connection. For this part, connect the phase A pulse output signal line of the encoder (for example, the green line) to the interface marked "Pulse Input A" on the controller. This is the main pulse signal transmission line, the controller will obtain the pulse signal generated by the encoder through this interface, so as to know the position or motion information.

If additional functions such as direction determination using B-phase pulses are required, the encoder's B-phase pulse output signal line (for example, the yellow line) can be connected to the corresponding "Pulse Input B" interface on the controller.

For the Z-phase pulse output signal line (such as the white line), if the controller has a corresponding zero pulse input interface, it can be connected to the interface. This is useful in applications where the zero point position needs to be precisely determined.

Precaution of single pulse encoder wiring

Congratulations for having completed the wiring, but you still need to pay attention to the following key points to ensure that it works properly and is accurately measured.

1. Supply voltage matching

It is noted that the power supply voltage for wiring is usually 5V to 24V, depending on the encoder model. When connecting cables, ensure that the power supply voltage matches the rated voltage of the encoder to avoid equipment damage or abnormal operation caused by too high or too low voltage.

2. Ground connection

The ground wire is used to connect the metal housing of the encoder to the ground to ensure the safe operation of the device and reduce signal interference. When connecting cables, ensure that the ground cable is firmly connected and reliable, and avoid interference with other lines. Similar to ground connection, it is important to strictly follow the wiring diagram of the encoder and controller to ensure each cable is properly wired. Last but not least, after the wiring is completed, a series of checks and tests are needed, including checking whether the voltage of the power cable is stable, whether the signal cable is correctly connected, and whether the ground cable is safe and reliable.

3. Signal line connection

Single pulse encoder wiring typically has one or more signal output lines for transmitting the measurement data. Therefore, connect signal cables correctly according to the type of encoder and application scenario, ensuring that the signal cable is securely connected to avoid signal transmission abnormalities caused by loose or poor contact.

4. Protective measure and communication protocol

The single pulse encoder is usually installed on the sports equipment, and it needs to be fixed firmly at the same time of wiring, and corresponding protective measures, such as waterproof, dustproof, etc., to ensure its stable operation in harsh environments. Meanwhile, if the encoder needs to communicate with other devices, such as controllers or displays, it is necessary to know whether the communication protocols between the devices are consistent to ensure the success of the communication.

Final Verdict

Although it seems complicated, as long as we master the basic principle and method, we can successfully operate single pulse encoder wiring, providing reliable signal support for accurate position detection and motion control.