Power supply issues for the operation station of DCS systems
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In the past, when designing DCS systems, the high cost of UPS units was a factor; therefore, the capacity of such units was chosen to be the most economical possible. As a result, many control stations relied on half of their power coming from the mains and half from the UPS, so that in case of a power outage, at least half of the control stations could continue to function. Now that UPS units are more affordable, when choosing a capacity, it is common to select one that is **much larger than the actual load; in fact, the load only reaches 30% even when the unit is operating at full capacity. Given that the control system runs many programs while in operation, an unexpected power outage can easily lead to damage to these programs or to the computer’s hardware. Therefore, all systems have now been switched to UPS power supply, which prevents software and hardware issues that might occur as a result of a power failure.
This post was last edited by jlshnlhj on 2011-8-25 at 16:10. Using half mains power and half UPS power is a precaution in case the UPS fails; it’s not because the UPS is too expensive. The same reason applies to DCS control cabinets, which require one supply from the mains and another from the UPS. No electronic device is immune to failure, and when the UPS part fails, it may not even be possible to get power from the bypass supply.
I’ve never really understood UPS that well; I’m trying to learn about it*~~~
I don’t know the truth – whether it’s for safety reasons or economic considerations. I’ve yet to see a setup where half of the power comes from the mains and half from a UPS; in such cases, isn’t there usually a switch to use the mains power? . Hehe
Misunderstanding of the concept: Under normal conditions, it is powered by the grid, with the battery being charged； When the power grid loses supply, the inverter takes over and the battery discharges to ensure power supply for the system ； In cases where high power supply standards are required, it is possible to consider installing emergency diesel generators ；
Several projects I’ve come across recently are designed to use redundant UPS power supply!