Regarding the issue of adding partitions to the instrument bridge
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This post was last written by wx_Wang81529 edited the picture on 2023-10-14 17:29. How should we understand the AC power line? The electrical 380v cable is also an AC circuit. Can I add a partition and put it in the instrument bridge? Or do we say AC power lines? It only refers to the AC power lines that are responsible for the instrument major in terms of division of labor.
This means that professional AC cables and control signal cables for instruments can be laid in the same bridge, but partitions must be added in the middle to reduce electromagnetic interference, such as 220VAC power supply for electromagnetic flowmeters, private liquid level meters, etc., and 220VAC or 380VAC power supply for electric actuators.
The specific understanding of AC power lines should be based on their actual application environment and operating requirements. In a general sense, the 380v cable is part of the AC circuit. In theory, a partition can be added and placed in the instrument bridge. However, whether this can be done requires consideration of issues such as the design of the instrument bridge, electromagnetic interference between the power cord and the instrument, and safety isolation. Therefore, if the "AC power line" you mentioned refers to the line that is under the responsibility of the instrument professional, then it may need to be operated in accordance with the regulations and requirements of the instrument professional. Specific operations also need to refer to the design requirements, operating procedures and safety regulations of relevant power systems and equipment. If you have further description of the specific situation or more specific questions, we can provide more detailed answers. .
There is actually no standard answer to this matter. Give a practical case: Where should the 0~30mA analog AC signal powered by 36V60Hz be placed? So I can only persist in doing it: 1. Electrical professional cables must not enter the instrument bridge. ； 2. If you are particularly afraid of interference or the interference is particularly large, handle it separately (separate wiring, use shielded wires, put metal through pipes in the bus trough...). personal experience: Power lines of 110V and above, electric valve power supply and feedback lines, solenoid valve signal lines, pulse signals, and AC power supply dry contact signals are all placed on the AC side. ； NAMUR switch, digital, high frequency, electromagnetic flowmeter related cables (may include 220V power supply) can be connected to the signal side.