Power distribution for pneumatic valve solenoids
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Since the solenoid valves of pneumatic valves are powered by 24VDC, does that mean there is a DCS for power supply, eliminating the need for a separate power distribution box?
It’s not necessarily the case; it depends on whether your solenoid valve is explosion-proof or intrinsically safe. If it’s explosion-proof, then the DCS will be responsible for power supply… If it’s intrinsically safe, then a safety barrier will handle the power supply
It’s very simple – it’s all powered by the DCS, as well as by your signal lines. Whether it is an explosion-proof design or a safety barrier, the signal wires must originate from the DCS.
I just want to ask where the power for the safety barrier comes from? It still comes from DCS, right?
Output on the safety barrier; the safety barrier can supply power
In other words, if the instrument is intrinsically safe, it needs to be powered by a safety barrier; if it is flameproof, it does not require a safety barrier and can be powered directly by the DCS
Is a safety barrier needed for the power supply of solenoid valves? Just use the power output from the power supply cabinet or relay cabinet directly, right?
Remember that solenoid valves also have a 220V power supply option; they can all be powered by the DCS