Common Fault Detection of Automation Equipment

Any automation equipment is composed of three parts: actuator, sensor and controller. When the automation equipment suddenly fails to work or the working sequence is abnormal, fault diagnosis must be carried out. Next, let's learn about the methods of diagnosing automation equipment faults from the three parts of the equipment.

1、 Check all power, air and hydraulic sources of automatic machinery.

Problems with power, air and hydraulic sources often lead to failures of automation equipment. For example, there are problems in power supply, including the power supply failure of the whole workshop, such as low power supply, burned fuse, poor contact of power plug, etc; The air pump or hydraulic pump is not opened, the pneumatic triplet or triplet is not opened, the load relief valve or some pressure valves in the hydraulic system are not opened, etc. The following aspects shall be included when testing automation equipment:

Power supply, including power supply of each equipment and power supply of workshop.

Air source, including air pressure source required by pneumatic device.

Hydraulic source, including the operation of hydraulic pump required by hydraulic device of automation equipment.

2、 Check whether the sensor position of the automation equipment is offset.

Due to the negligence of equipment maintenance personnel, there may be errors in the position of some sensors, such as not in place, sensor failure, sensitivity failure, etc. The sensor position and sensitivity shall be checked frequently, and the deviation shall be adjusted in time. If the sensor is broken, it shall be replaced immediately. Many times, due to the vibration of automation equipment, most sensors will be loose after long-term use. Therefore, during daily maintenance, it is necessary to often check whether the sensor position is correct and fixed firmly.

3、 Check the relay, flow control valve and pressure control valve of automation equipment

Like the magnetic induction sensor, the relay will also have grounding adhesion after long-term use, so the normal electrical circuit cannot be guaranteed and needs to be replaced. In the pneumatic or hydraulic system, the opening of the throttle valve and the pressure regulating spring of the pressure valve will also loosen or slide with the vibration of the equipment. Like sensors, these devices are components requiring routine maintenance in automation equipment.

4、 Check the electrical, pneumatic and hydraulic circuit connections

If no problems are found in the above three steps, check all circuits. Check whether the wires in the circuit are open circuit, especially whether the wires in the trunking are cut by the trunking due to pulling. Check the air tube for damaging creases. Check whether the hydraulic oil pipe is blocked. If the air pipe has serious creases, replace it immediately. Replace the hydraulic oil pipe as well.

5、 After ensuring that the above steps are correct, the fault may appear in the controller of the automation equipment, but it can never be a program problem. First of all, do not be sure that the controller is damaged. As long as there is no serious short circuit, the controller has short circuit protection, and the general short circuit will not burn the controller.

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