Common fault detection of non-standard automation equipment

2021-02-26 13:39:23 浙江铭君自动化设备有限公司 Viewd 147

Any automation equipment is composed of actuators, sensor parts, and controller parts. When the automation equipment suddenly fails and does not work, or the work sequence is abnormal, fault diagnosis must be performed. Let's learn about the method of diagnosing the failure of automation equipment from the three parts of the equipment.


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

Problems with power, air, and hydraulic sources often cause automation equipment to malfunction. For example, power supply problems, including power supply failures in the entire workshop, such as low power supply, burned insurance, poor contact of power plugs, etc.; air pump or hydraulic pump is not turned on, pneumatic triple or double piece is not turned on, and the relief valve in the hydraulic system Or some pressure valves are not opened, etc. The following aspects should be included when testing automation equipment:


(1. Power supply, including the power supply of each equipment and the power supply of the workshop.


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


(3. Hydraulic source, including the working conditions of the hydraulic pump required by the hydraulic device of the automation equipment.


 


2. Check whether the sensor position of the automation equipment is shifted.

Due to the negligence of the equipment maintenance personnel, the position of some sensors may be wrong, such as not in place, sensor failure, sensitivity failure, etc. Always check the sensing position and sensitivity of the sensor, adjust it in time if there is a deviation, if the sensor is broken, replace it immediately. In many cases, in addition, due to the vibration of the automation equipment, most of the sensors will be loose after long-term use. Therefore, during routine maintenance, you should always check whether the position of the sensor is correct and whether it is firmly fixed.


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

Relays are the same as magnetic induction sensors. They will also have ground adhesion after long-term use, which makes it impossible to guarantee the normality of the electrical circuit and needs to be replaced. In a pneumatic or hydraulic system, the opening degree of the throttle valve and the pressure regulating spring of the pressure valve will also loosen or slip with the vibration of the equipment. These devices, like sensors, are components that require routine maintenance in automation equipment.


4. Check the electrical, pneumatic and hydraulic circuit connections

If no problems are found in the above three steps, then check all circuits. Check whether the wires in the circuit are disconnected, especially whether the wires in the wire groove are broken by the wire groove due to pulling. Check the trachea for damaged creases. Check if the hydraulic oil pipe is blocked. If the trachea shows a severe crease, replace it immediately. The hydraulic tubing should also be replaced.


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, don't be sure that the controller is destroyed. As long as there is no serious short circuit, the controller has short circuit protection inside. A general short circuit will not burn the controller.