1、 Fault characteristicsAfter the PLC is powered on, the internal self diagnostic program of the system is first executed to check whether the various components of the PLC are operating normally, and the results of the inspection are displayed to the operator. The content of self diagnosis includes I/O part, memory, CPU, etc.RUN LED, PROG LED, ERR LED, and ALARM LED indicator lights are installed on the front panel of the FPl series PLC control unit. During the execution of the system's user program, if there is a malfunction or special situation, it can be displayed to the operator through the above indicator lights, making it easy for the operator to detect and troubleshoot the problem in a timely manner. Control unit indicator light status Explanation state RUN PROG ERR/ALARM     bright extinguish extinguish N...

（1） Firstly, the PLC system has its own dedicated grounding, which can easily solve many interference problems. （2） PLC power supply with isolation transformer can eliminate interference sources from the power input side （3） Adding a 1:1 signal isolator can directly eliminate interference sources from the signal source side. （4） Adding magnetic rings can eliminate interference sources in signal transmission lines. （5） Switching signals and analog signals should be separated, and analog signals and digital signals should not share the same multi-core cable, let alone power lines. From the perspective of comprehensive wiring, they should be separated from interference sources as much as possible. （6） It is best to use separate shielded wires for analog signals, suspended on the input and output sides, and grounded on the PLC side to directly protect the signal so...

1. 445 servo disconnection software alarm: machine tool cannot operate normally   Repair steps:   Firstly, check that the hardware connections of the system are normal, but there is a significant deviation between the feedback values of the servo motor and the grating ruler;     The second is to modify the function bit parameter of the servo adjustment screen, No.2003.1=0, and cancel the servo disconnection software alarm function. This way, there will be no more software alarm for the 445 servo disconnection, and the machine tool will resume normal operation.   Of course, this method can only be used in situations where precision is not very high, as it eliminates the deviation monitoring function of full closed-loop and semi closed-loop feedback. The complete solution still requires maintenance and adjustment of the mechanical transmission mechanism. &nb...

Electrical fault diagnosis of grid connected photovoltaic inverters introduction: Solar photovoltaic power generation, as a form of clean energy, has been widely applied and developed in recent years. Grid connected photovoltaic inverters are key equipment in solar power generation systems, used to convert direct current into alternating current and inject it into the grid. However, in practical applications, electrical failures are inevitable due to the harsh working environment of photovoltaic inverters and potential defects in the equipment itself. Therefore, carrying out the diagnosis of electrical faults in photovoltaic inverters is of great significance for ensuring the normal operation and safety reliability of photovoltaic power generation systems. 1、 Types of electrical faults in photovoltaic inverters The electrical faults of photovoltaic inverters can be divided into t...

The high degree of automation of spraying robots greatly improves the production efficiency of enterprises. However, if the operation of spraying robots is not familiar or improper, it can also cause some unnecessary spraying defects. Common solutions to spraying defects of spraying robots are as follows. 1、 Product granulation after spraying by spraying robot This situation is the mixing of impurities in the spray material. Change different types of paint before cleaning the spray gun. The nozzle pressure is too high, the diameter is too small, and it is too far from the object surface. The paint is left for too long after adding diluent. Insufficient mixing and settling. resolvent: Keep the construction site clean. Different types of paints cannot be mixed for use. Choose an appropriate caliber, spray distance should not exceed 25mm, storage time should not be too long, an...

1、 The lathe operator must be familiar with the safety operating procedures, understand the structure, performance, and technical data of the machine tool. After receiving professional skills training and obtaining the corresponding qualifications, one must hold a certificate before taking up the post.   2、 Before driving, check whether each guide rail of the machine tool has been lubricated, whether each lubrication point has been filled with oil, whether the transmission oil circuit is unobstructed, whether there is enough oil in the oil tank, whether the exposed screws are tightened, and whether the electrical switches are functional. Wait for everything Drive only after normal operation.   3、 Before starting work, check the trial operation of the machine tool, whether the lubrication pump is oiled, whether the variable speed operation handles are flexible, whether ...

Motor winding repair 1. Short circuit of stator winding Winding short circuit refers to the direct collision of two copper wires caused by insulation damage to the coil wire, resulting in the current flowing directly into the circuit without passing through the load. The main reasons are high power supply voltage, excessive current, moisture and vibration wear on the winding, and accidental scratching of the outer insulation of the wire during repair of the embedded wire. After a short circuit fault occurs in an electric motor, high temperatures will be generated at the fault location, causing more insulation to burn out. Therefore, when checking for a short circuit fault in a running electric motor, carefully observe the motor coil for any burnt marks or smell after the motor stops running. It is also possible to run the motor without load for a period of time, immediately remove...

Motor winding repair 1. Short circuit of stator winding Winding short circuit refers to the direct collision of two copper wires caused by insulation damage to the coil wire, resulting in the current flowing directly into the circuit without passing through the load. The main reasons are high power supply voltage, excessive current, winding moisture and vibration wear, and repair of embedded wires Accidentally scratching the insulation on the outer layer of the wire. After a short circuit fault occurs in an electric motor, high temperatures will be generated at the fault location, causing more insulation to burn out. Therefore, when checking for a short circuit fault in a running electric motor, it is recommended to stop the motor after it has stopped Carefully observe whether there are any burnt marks or burnt smell on the motor coil. It is also possible to run the motor withou...