UPS explanation

[MohdYaseen2010]

I am not familiar with electrical setup, so may you find my question is little primitive;

Can we merge two UPS systems in one (we have UPS system for one plant, & we are plan in future to shift another UPS system from another station to be placed with the first UPS, so in order to withstand the full applicable loads, can both systems works together as one system? if is it possible, what the things that I should consider for make this merge possible (rather than the available building space)?

Another question :
There are two UPS one AC & the other is DC.
Normally they state in the specification our UPS should take the control loads (I think mean DCS) & emergency loads (I think mean ESD).
My question which of these should be belong to AC UPS & which should be belong to DC UPS?
also if he mentioned for example the UPS load is 30KVA, does it mean AC UPS or DC UPS or both?

Mohd Yaseen

 

[GroovyGuy]

Ho Mohd,
Yes, it is possible to provide a DC & AC UPS from the same set of equipment. This is assuming of course on the voltage of the DC UPS; it needs to be the same potential as the battery voltage (ie 125Vdc). With this type of system, the rectifier & battery serve the same function for both the AC & UPS. The inverter only serves the AC UPS.
Although the unit kVA is often referred to an AC system; I would not bet the farm on whether the 30kVA applies to the AC UPS only or if it applies to both the AC & DC UPSs.
GG


"I have not failed. I've just found 10,000 ways that won't work." Thomas Alva Edison (1847-1931)

 

[racookpe1978]

For a single digital UPS and battery, the UPS sets the current, power, and frequency while in a backup mode on the one battery. Easy to understand.

For two UPS both delivering only a part of the load on the bus, how is load shared, how is frequency set between the two, and how is battery life kept "even" so one battery is carrying all of the load until it fails, while the second has little (or no load)?

 

[MohdYaseen2010]

Dears;

Thanks for your feedbacks.

Mohd Yaseen