Analysis of machine tool and lighting transformers

Existing problems At present, most machine tools and equipment have one or more than two control transformers to meet different requirements. There are dedicated to the control loop; there are for the lighting circuit; also a total of control and lighting circuits.

From years of equipment maintenance practice, it has been found that transformers used in the lighting circuit of machine tools and the frequency of transformers used in control and lighting circuits are frequently burned out. The observation and analysis have the following two reasons: On the one hand, the transformer itself is of poor quality, and the other is On the one hand, the output side of the secondary winding of the transformer is overloaded. The former needs to be further improved by the manufacturer, while the latter requires us to further analyze the reasons and seek solutions to the problem.

BK series single-phase control transformer secondary side lighting part of the capacity distribution is as follows: total capacity VA501001503005007001500 secondary side lighting capacity VA454590454590459045904590135 From the above table can be seen that the secondary side lighting capacity is a 40W safety lamp designed as an independent lighting unit, a Lamp 45VA, two lamps 90VA, three lamps 135VA. In our equipment's control system, the system is designed with this capacity, but with the improvement of people's living standards, the lighting brightness of the working environment also has higher requirements, and the 40W machine tool lighting is not bright enough, and more than 60W is used. , This 45VA capacity can not meet this requirement, obviously can not work for a long time, there is often a burning part of the lighting situation, the use of 90VA capacity will be wasted. The transformer that is shared by the control and lighting also burns the entire transformer due to the burning of the lighting windings, affecting the normal operation of the entire system.

Several methods to solve problems and their effects There are several ways to solve the above problems: First, to strengthen the management of equipment, 45VA capacity of the lighting part is absolutely not allowed to use 60W light bulbs, while the 90VA, 135VA capacity of the lighting part does not allow more than 80W And 120W; Second, in the new design or large modification of the control transformer and lighting transformer separate, to avoid the impact of lighting windings and affect the operation of the entire control system; Third, re-adjust the distribution of lighting control capacity in the transformer, each Transformer with 60W lamp design, taking into account the transformer efficiency, the revised part of the lighting with a single lamp 70VA, two 140VA, three 210VA. In this way, the normal operation can be satisfied regardless of whether the 40W or 60W light bulb is used.

The above methods have been put into production practice in recent years with different effects: Method One: Strengthen management. There is a certain effect on the lighting system with a lamp of 45VA in the equipment. However, if the management is relaxed, similar problems will appear again. Can not fundamentally solve the problem; method two, transform the equipment control system, so that it is separated from the lighting, better than the former, but this only plays a role in the normal operation of the control system, but the lighting part is still There is a burnout situation; Method 3, replace the burnout transformer, so that the control and lighting are separated, and the lighting capacity is designed for each VA70VA. This method works best, and no burn-out phenomenon has occurred so far, which fundamentally solves the problem of burning out the transformer. Make the device really long, full, stable operation.