On Monday 08 December 2003 06:03 am, Hylton Conacher (ZR1HPC) wrote: > Lanman wrote: > > On 12/7/2003 at 3:22 PM John Richard Smith wrote: > >>Lanman wrote: > >>>John; The basic purpose of a UPS is to filter or condition the > >>>electrical power which your computer > >>>receives. Typically, your computer runs off of the battery inside > >>>the UPS, and a charger keeps the > >>>battery charged from the wall outlet. > > lanman gave you partially incorrect informtion ie that it is continuous! > John be warned that this is an ideal and preferred setup. > > Some UPS's actually let the equipment plugged into it run run off the > main supplied power that is is also using to charge the batteries, > filtered of course to prevent spikes but still basically straight > through. When a power outage occurs the UPS detects this and switches > the computer supply from the now dead mains supply to the backup mains > supplied via the battery and an inverter to transform the voltage of the > battery (12volts DC) to 230v AC. Sometimes the time taken for the UPS to > switch results in your computer losing power/rebooting. Nothing that a > kettle would notice but a PC's nightmare. > > Some UPS's work as lanman described ie always off the battery but do > check if the UPS you buy does this or does the 'switching' thing. It is > a FAR better UPS to have than the 'switching' one. > > >>Thanks, > >> > >>So it's DC battery kept charged by a rectified transformer output, > >>so then the UPS must have a means of stepping up voltage from whatever > >> the DC battery stores it at, converts it back to mains AC supply > >> voltage, in my case 230v AC and then supplies it to your computer, but > >> does it just step in when needed or is it continuous ? > > It depends on the UPS structure. > See the above explanation > > A UPS is usually put inbetween your computer equipment and preipherals > and the mains supply coming into that part of the house ie select a plug > or several, depending on the rating of the UPS, and feed your mains plug > output into the UPS input. Then plug in those computer peripherls and > computers you want to protect from power outages, into the UPS output. > > The rating of the UPS is probably the next important step. I would take > the power supply rating of your computer in watts and convert it into a > vA rating ie volts x amps. Unfortuneately I don't know how to convert > watts to vA rating. Volts times amps equals watts. since volts is constant (ie 240) amps is what changes in the circuit as items (load) is added > I think the vA rating is the same as watts enabling > you to just add the wattage of your PC onto the vA total you get. > Perhaps lanman can assist since he's done a varsity course on it? Then > take the current drain (A) of all your computer peripherals and multiply > it by the voltage they are running on. Your 230v AC is assumed here to > give you a vA rating that can be added to the vA rating of the PC's you > want to connect to the UPS. > > Going into a UPS store and asking for a certain vA rating of a UPS for > the total of all the devices you want to protect will certainly get you > more respect and it wil be something you can normally check yourself as > it is printed on the UPS carton. > > >>-- > >>John Richard Smith > >>[EMAIL PROTECTED]
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