For a DCS system with 290 points, what size UPS is generally used?
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A DCS system, which includes PLC intermediate relays as well as 3 industrial computers. The on-site instruments include various transmitters and control valves, totaling over 200. By the way, how much is a pneumatic control valve approximately? What size is UPS generally used? Should it be single-phase or three-phase?
A 6KVA/0.5H unit is sufficient for UPS use; the control valve should be selected based on the actuator, as intelligent actuators generally require more power.
When choosing a UPS, it’s generally better to opt for one with three-phase input and single-phase output. Better UPS models can still operate even if one phase is missing in the three-phase input. 6 KVA is sufficient; a lower capacity unit isn’t practical for use. It’s better to choose an UPS that operates at line frequency. If the control points are equipped with solenoid valves, the power consumption will be higher. A DCS typically consumes a few hundred watts of power, while three industrial computers also consume a few hundred watts each. For 200 pressure transmitters and control valves, the power consumption is 200*0.48=96 watts; so the total power consumption isn’t that high
For UPS systems, those with a capacity of over 20 KVA are generally designed to have three-phase input and single-phase output. For capacities over 60 kVA, a three-phase input and three-phase output configuration is generally considered. For less than 20 kVA, it is generally considered as having both input and output. Regarding the capacity of the UPS for the poster, since you don’t have any power meters, the power consumption of the three industrial computers is relatively high; it’s reasonable to assume that each of them consumes around 500 watts. The PLC itself consumes very little power, estimated at around 500 to 1000 watts. Therefore, a UPS with a capacity of 6 kVA should be sufficient for your needs. The efficiency of smaller UPS units should be considered to be no more than 80%.
A DCS system with 290 points – it’s a small system; 5KVA is sufficient
What are the advantages of power-frequency machines? The people I asked Emerson last time said that smaller UPS units (10kva, 5kva, etc.) are no longer manufactured as line-frequency models
Industrial-frequency devices use large transformers, which result in many high-frequency components being filtered out; whereas high-frequency devices produce waveforms with relatively strong high-frequency harmonics. Previously, people preferred power-frequency machines, even though they were more expensive. If you don’t have a power-frequency machine, it’s fine to choose a high-frequency one; just pick a good brand.
Only the machine, with no extensive on-site power supply. 5,000–6,000 VA is sufficient. It’s difficult to estimate the price of a control valve without knowing its parameters; it can cost at least 10,000 to 20,000, or even several million in the most extreme cases