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what UPS do i need for a machine with 2250VA?

luv2liv

luv2liv

Diamond Member
i have this machine labeled in the back with 2250VA, 120VAC, 47.5-63Hz. To make matters worse, the wall socket is not parrallel like a standard appliance, the plug is perpendicular to each other.
what UPS do i need to keep the machine running in case of a black out for at least 15minutes?

thank you!
 
Yeah you are gonna need a sizable UPS like a 3kva unit assuming it is an inductive load.
 
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What is the machine, and are you sure it's UPS safe? Some machines with massive inrush currents are not UPS stable unless you oversize them. For instance, running air conditioners, compressors, laser printers, or similar devices may require you to size 4-5x higher than the rating to prevent the UPS tripping on the inrush current. In other words, you may need a 12kVA unit to deal with it depending on what the device is.
 
I think that was a mis-type. It was supposed to be 3 KVA, not KV.

The plug is no surprise. At 2250 KVA, fed form 120VAC, the max current use would be 18.5A, so a 20 A connection and feed cabling and breaker rating is required.

You will need to watch out for something you don't note. The KVA rating is the max RATE of power feeding to the unit, with NO consideration for how long that power can last. MANY small-to-medium UPS units are able to keep power coming for a very short time like 3 to 5 minutes, sufficicent ONLY to give you time to shut down cleanly. To supply power at that rate for 15 minutes or more would take a pretty large unit, so be sure to look for the spec of how LONG the unit can power your system fully.
 
Paperdoc said:
I think that was a mis-type. It was supposed to be 3 KVA, not KV.

The plug is no surprise. At 2250 KVA, fed form 120VAC, the max current use would be 18.5A, so a 20 A connection and feed cabling and breaker rating is required.

You will need to watch out for something you don't note. The KVA rating is the max RATE of power feeding to the unit, with NO consideration for how long that power can last. MANY small-to-medium UPS units are able to keep power coming for a very short time like 3 to 5 minutes, sufficicent ONLY to give you time to shut down cleanly. To supply power at that rate for 15 minutes or more would take a pretty large unit, so be sure to look for the spec of how LONG the unit can power your system fully.
Click to expand...
No it's 2.25 KVA, not 2250KVA :awe: Otherwise you are going to need a substation xd.
 
thecoolnessrune said:
What is the machine, and are you sure it's UPS safe? Some machines with massive inrush currents are not UPS stable unless you oversize them. For instance, running air conditioners, compressors, laser printers, or similar devices may require you to size 4-5x higher than the rating to prevent the UPS tripping on the inrush current. In other words, you may need a 12kVA unit to deal with it depending on what the device is.
Click to expand...

Accurate and precise high performance GC system | Agilent

The 7890B Gas Chromatograph (GC) System has been the worlds most widely used GC system. Quality design, retention time locking, optional low thermal mass and capillary flow technologies. This product has been discontinued but is still being supported. Refurbished units may be available. The...
www.agilent.com www.agilent.com
 
luv2liv said:

Accurate and precise high performance GC system | Agilent

The 7890B Gas Chromatograph (GC) System has been the worlds most widely used GC system. Quality design, retention time locking, optional low thermal mass and capillary flow technologies. This product has been discontinued but is still being supported. Refurbished units may be available. The...
www.agilent.com www.agilent.com
Click to expand...

While I won't pretend to know the ins and outs of gas chromatography, Agilent doesn't recommend the use of a UPS: https://community.agilent.com/servlet/JiveServlet/download/1871-1-2395/UPS_Letter.pdf

This is mainly because their methodology of switching off and on their heaters produces a high transient load (10% -> 100% -> 10% load on each cycle of load voltage!), this can really mess with UPS units not sized for the load.

This is one of those things that would have to be largely oversized to ensure that the transformer could keep up. I think you would need to talk to a solid VAR on this one or to Eaton / APC / Vertiv themselves to get their recommendations. It will almost certainly need to be an Online UPS (because Line-Interactive units tend to have smaller transformers that can't take as much abuse) and would probably need to be on the 5-10kVA level to ensure that those transient voltage swings are just a small part of the overall power capacity.
 
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