As a complete set of electrical maintenance personnel, it is of great significance for improving labor productivity, reducing economic losses and safe production to be able to accurately identify the cause of the failure and reasonably and correctly remove the failure when encountering electrical failure. Here are some troubleshooting methods:
1、 Resistance test method
The resistance test method is a common measurement method. It usually refers to a method of measuring whether the motor, line, contact, etc. conform to the nominal value of use and whether they are on or off by using the resistance range of a multimeter, or measuring the insulation resistance between phases and between phases and between phases and ground with a megohmmeter. When measuring, pay attention to the accuracy of the range used and the calibration meter. Generally, when using the resistance method to measure, the general practice is to select the low gear first, and at the same time, pay attention to whether the measured line has a circuit, and live measurement is strictly prohibited.
2、 Voltage test method
Voltage test method refers to a method of measuring the voltage value in the circuit by using the corresponding voltage range of the multimeter. Usually, the voltage of power supply and load is measured sometimes, and the open-circuit voltage is also measured sometimes to judge whether the circuit is normal. When measuring, pay attention to the gear position of the meter and select the appropriate range. Generally, when measuring unknown AC or open-circuit voltage, the high range of voltage is usually selected to ensure that the operation is not carried out under high voltage and low range, so as to avoid damaging the meter; When measuring DC at the same time, pay attention to the positive and negative polarity.
3、 Current test method
The current test method is usually used to measure whether the current in the circuit conforms to the normal value to determine the cause of the fault. For the weak current circuit, the ammeter or multimeter current range is often connected in series in the circuit for measurement; Clamp ammeter is often used for detection of strong current circuit.
4、 Instrument test method
Measure various parameters with the help of various instruments and meters, such as observing the waveform and parameter changes with an oscilloscope, so as to analyze the cause of the fault, which is mostly used in weak current lines.
5、 Routine inspection method
Find out the cause of failure by relying on human sense organs (such as some electrical equipment with burnt smell, ignition, discharge, etc.) and some simple instruments (such as multimeter). This method is commonly used in maintenance and is also the first one to be used.
6、 Replacement of original parts
That is, when a certain device or circuit board is suspected to have a fault, but cannot be determined, and there are substitute parts, the test can be replaced to see whether the fault disappears and returns to normal.
In actual work, the method and method of troubleshooting can only be determined according to the specific situation of the fault, and there is no strict mode and method, which will be difficult for some maintenance personnel. In the process of troubleshooting, there are often many detours, and even large losses. We hope to help you with the above methods. Please come to our website for more matters http://www.tongyuhengcheng.com Ask!