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How does DCS bearer prevent internal circuits?

Mostly switches have output of110volts Ac which goes directly to DCS cards however DCS is working on5 volts dc. Which type of the bareers they use to prevent the internal circuits of DCS and how it works?

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Question ajoutée par Muhammad Arsalan Afzal , Instrument Technician , dh chemicals
Date de publication: 2013/07/02
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Musharif Hussain
par Musharif Hussain , Sr. Engineer (Instrumentation &Control) , Matiari Group

Mostly industries take the connections from Electricity providing companies.
Whether200Vac of110Vac.
DCS designing companies use Power Supply (or inverters) to supply dc voltage, where comes DC Power Supply.
You have to look for a DC Power Supply nearby your DCS system (panel box).
And these DC Power supplies have high current ratings, depend on your field devices, and voltage ratings from5,12,24 even48 Vdc.

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