In the context of intelligent manufacturing, the use of CNC precision machining machine tools is becoming more and more extensive, and the operation and maintenance work is also very arduous.
Machine tool is an important asset of manufacturing enterprises, with its precision and preciousness occupies a very important position, must ensure the smooth and reliable operation of machine tools. However, there are often some inexplicable faults in the actual operation of machine tool appliances, in addition to the aging or quality reasons of the machine tool itself, regularly check the power supply quality, temperature, etc., and carry out planned maintenance according to the test results.
Here are a few common considerations
1. Power supply quality
From the perspective of electricity consumption, the voltage, current or frequency deviation that causes the failure or failure of the electrical equipment to work properly are all power quality. In addition, some loads will also affect the quality of the power grid during operation, injecting harmonics, causing grid voltage fluctuations, affecting the operation of adjacent loads, etc.
Problems with the quality of power supply will not only affect the normal and continuous operation of electrical equipment, but also affect the operation efficiency. Machine tools have high requirements for power supply quality, such as voltage amplitude with load changes to ensure a certain stability, otherwise it will cause various malfunctions, harmonic content can not be too large, otherwise it will overheat, reduce the insulation performance of the equipment, and three-phase unbalance.
Here's a real-world test example:
Problems encountered:
The grinding gearbox imported from Germany does not necessarily cause frequent machine tool failures, damaged components in the inverter, expensive maintenance costs, and causes long-term downtime, delaying production and construction period
Need: Find the cause of the failure
Users report that when the inverter is not damaged, it occurs when the machine tool is running without load. Generally, if the electrical appliance is damaged, it is necessary to check the voltage, current, amplitude and waveform.
Tests were conducted in three locations using Fluke 1777:
Inverter input, check the power input signal
The back end of the filter, the filtered voltage and current signal
The output of the inverter, the signal converted by the inverter.
Two main problems were found: unbalanced three-phase currents and large inrush currents
The following are the results of the field measurement: two main problems were found
Problem 1: Three-phase current unbalance - input power
In daily work, we often do a physical examination of the power supply quality of key equipment, find abnormalities (excessive harmonics, three-phase unbalance, large voltage fluctuations, etc.), and take countermeasures to avoid production losses due to shutdown and damage to important production equipment.
2. Insulation performance
There is generally oil mist, dust and metal powder in the air in the machining workshop, once they fall on the circuit board or electronic devices in the CNC system, it is easy to cause the insulation resistance between components to decrease, and even lead to damage to components and circuit boards.
In daily maintenance, it is necessary to regularly test the insulation performance of the drive motor and cable, and the use of digital insulation meters can greatly improve the maintenance efficiency.
The Fluke 1537 Insulation Resistance Tester provides a maximum test voltage of 2500V and a 500GΩ test range. The main unit weighs only 1.3kg, so it can be easily carried anywhere in the workshop. In addition, the 1537 automatically calculated dielectric discharge rate (DD) can detect insulation problems that are not easily detected in multi-layer insulation, so as to prevent problems before they occur
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