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Design of motor control cabinets

2008-02-26View Original

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I want to put 3 frequency converters and power supply modules in one cabinet; the power of each frequency converter is only 0.37 kW. The power supply module needs to provide 380VAC to the motor, as well as 24Vdc to the field instruments. Is there interference between the 380V power cable and the 24VDC power cable here? What impact will a 380V power supply have on the proper operation of an inverter? How should it be designed to avoid such interference and effects? At the same time, due to space constraints, the motor control cabinet and the system control cabinet have to be stacked one on top of the other; the total height of these two cabinets must not exceed 1.8 meters. The two types of power cables and the 4–20mA field instrument signal cables are located relatively close to each other. How can we prevent the high-voltage power cables from interfering with the control signals?

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