Rong Zhong electrical stock, Rong Zhong electrical equipment

In the actual production process, electrical faults occur in a wide range of automated production lines, and the faults are ever-changing and random. Troubleshooting methods can only be based on the specific situation of the fault, there is no fixed model and unified standard.

I. The Basis of Eliminating Electrical Faults

The basis of eliminating electrical faults refers to the necessary conditions for eliminating electrical faults. In order to eliminate the fault completely and solve the problems in actual production, it is necessary to find out the causes of the fault.

1. Quality Requirements for Maintenance Personnel

As an electrical maintenance technician, he should have the following qualifications:

(1) Wide range of professional knowledge. Basic knowledge of computer principle, electronic technology, electrical principle, automatic control and electric drive, detection technology, mechanical transmission and machining technology should be mastered or understood. We should understand both electricity and machine.

Second, diligent in learning, good at analysis and summary. Electrical maintenance personnel should improve their logical thinking ability and have a good analytical mind.

3. Strong hands-on ability and practical skills. The repair of electrical system can not be separated from the actual operation. Maintenance personnel should operate the repaired system manually, check alarm information, modify parameters, call diagnostic functions, carry out manual and trial operation of the equipment, and use the necessary tools, instruments and instruments for maintenance. For maintenance personnel, it is very important to be bold and careful, that is, to dare to do it, and to be careful and orderly.

2. Necessary technical information and preparation

Improvement and collation of maintenance data

A common problem in the maintenance of electrical equipment is incomplete information, often only the electrical schematic diagram of the strong part or the instructions for the use of the equipment.

(2) On the Necessary Spare Parts

For the maintenance of electrical system, spare parts are indispensable. If there is no spare parts to be replaced or used in case of failure, it will delay the time of troubleshooting and increase the difficulty of maintenance.

3. Understand the movement form of the equipment and the specific position of each component in the equipment and the layout of the circuit.

When maintaining electrical equipment, first of all, we should understand and master the electrical control schematic diagram of the equipment, understand the working flow and movement form of the equipment, and summarize the electrical control characteristics of the equipment.

2. Detection and Removal of Faults

With the relevant theoretical basis, master the working principle of the equipment, but in order to effectively analyze and judge the actual operation, and find out the fault point smoothly, we need to have the relevant means, which is the detection means and general methods needed to eliminate the fault.

1. Fault Detection

(1) Resistance method

Usually refers to the use of multimeter resistance to measure whether the motor, circuit, contacts and other conform to the use of nominal values and whether on or off a method, or the use of megohm meter to measure phase to phase, phase to ground insulation resistance and so on.

(2) Voltage method

Voltage method is a method of measuring the voltage value in a circuit by using the corresponding voltage shield of a multimeter.

(3) Current method

Current method is usually used to measure whether the current in the circuit conforms to the normal value in order to determine the cause of the fault.

2. Troubleshooting methods

The commonly used methods are as follows:

(1) Routine examination

Depending on human sensory organs, this method is often used in maintenance.

(2) Replacement method: that is, if a device or circuit board is suspected to be faulty, it can be replaced by a test to see if the fault disappears.

(3) Direct inspection method: In understanding the cause of the fault or judging the location of the fault based on experience, the suspected fault points can be directly inspected.

(4) Step-by-step elimination method: If a short-circuit fault occurs, part of the line can be gradually removed to determine the fault range and fault point.

The method of adjusting parameters: In some cases, when a fault occurs, the components in the line are uncertain and bad, and the line contacts are good, but the system parameters may be changed due to external factors because of inappropriate adjustment of some physical quantities or long running time, thus causing the system to not work properly. At this time, the system should be adjusted according to the specific situation of the equipment.

3. General steps for troubleshooting

There is no fixed mode for troubleshooting, but in general, there are relevant rules. The usual steps can be roughly divided into: symptom analysis equipment inspection fault location troubleshooting validation effect.

1. Symptom analysis

(1) Ask the operator for information about the process of equipment use and change, damage or failure, as well as some similar failure phenomena, causes and measures taken in the past.

(1) Observation and preliminary examination: A comprehensive observation of the equipment often leads to valuable clues.

(3) Start-up equipment: In general, operators should be required to start the equipment according to normal operating procedures. If the fault is not caused by the whole machine, the electrical control system can be paralysed. The trial operation method can be used to start the equipment, to help the maintenance personnel have a comprehensive impression of the original state of the fault.

2. Equipment Inspection

Based on the preliminary conclusions and doubts from the symptom analysis, a more detailed examination of the equipment is carried out, especially in areas where failure is considered possible. Attention should be paid to avoiding unnecessary disassembly of equipment at this stage and preventing more malfunctions caused by imprudent operation.

3. Determining the Fault Point

According to the fault phenomena, combined with the principle and control characteristics of the equipment, analysis and judgment are made to determine the scope of the fault, which is the electrical fault or the mechanical fault? Is it a DC circuit or an AC circuit? Is it the main circuit or the main circuit?