I have a question regarding the power supply for electric valves
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There is a production unit that uses electric valves； How are your electric valves powered? Is it powered by electricity or by instruments? How many cores are needed for cables (is it necessary to include a ground wire)?
Well, first we need to see if your valve is 380V, 220V, or 24V Grounding is of course necessary.
220V electric valve under temporary consideration
Electric valves are typically powered by 220V or 380V. The signal input and feedback use 4-20mA, as well as other signals such as indication of switch position or fault status. They come with servo amplifiers, and should be connected according to the wiring instructions; generally, the instruments are powered by 220V while the electrical components are powered by 380V
24V is available, of course, but with a lower power output. For 220V, it depends on the division of responsibilities in your area; generally, it falls under the category of instrumentation, with the instrumentation itself being responsible for power supply and subsequent maintenance. But it might be more convenient to draw power directly from the power cabinet, so it was simply assigned to the electrical team.
Part 4 of HG/T20636-1998, \"Regulations on the Management of Professional Design in Automatic Control\", namely HG/T20636.4 \"Division of Design Tasks between the Automatic Control and Electrical Engineering Teams\": 2.0.1 The 380/220 and 110V AC power supplies for instruments shall be designed by the electrical engineering team。...... The 2017 version of these regulations has been published; I don’t have it available, so I can only provide the 1998 version. It is unknown whether any changes were made in the 2017 version.
Thank you for the explanation. If the 380V power supply is handled by the electrical department, does the UPS that supplies power for Class I loads also need to be configured by the electrical department?
Generally, voltages of 220V and above are supplied by the electrical department. In Shandong, industrial-grade UPS units are now required; commercial-grade UPS units are no longer allowed to be used. Moreover, two UPS units are needed, so the UPS system has also been assigned to the electrical department. At that time, 10-core wires were used for electric valves, and grounding on-site was necessary, as specified in the relevant standards.
Electric on-off valves fall directly under the electrical category. If it is a control valve, the voltage needs to be checked.