Uninterruptible Power System 800 Guia de Instalação descarregar pdf (Página 11)

PROPERTY OF SOLIDSTATE CONTROLS, INC. 7/1998

supply this transformer mounted in a matching cabinet, if desired, or can supply a standard

transformer of another manufacturer in their own floor-mounted enclosure. Some customers may

wish to have their own electrical contractor supply and install this along with other necessary

equipment.

The customer’s existing distribution panels, which previously supplied the computer loads, should

be re-evaluated before utilizing with the UPS. The inverter portion of the UPS can deliver only a

small amount of current above its nameplate ratting before the output voltage drops off drastically.

Consequently, the current available to trip the distribution breakers is severely limited. Ideally

breakers and/or fuses should be selected to clear the possible faults without overloading the

inverter. When overloads do occur, the static switch will transfer all loads to the bypass (utility)

source without interruption, where the large capacity will clear the fault. Since all transfers involve

some risk to the load, all unnecessary transfers should be avoided.

For further information regarding fault protection, please refer to “UPS Systems Distributor Network

Protection” by Laura Andrei, R & D Engineer.

An Uninterruptible Power System (UPS) is the most complete form of power conditioning available.

A UPS can provide complete protection from all forms of line voltage transients, surges and sages,

long duration brown outs, and is the only device which can provide total ‘no break’ back-up

protection against black outs.

It is commonly recognized that the various voltage related problems that trouble your computer

come from two sources. The first is atmospheric and accounts for approximately 20% of the total

power problems. The remaining 80% occurs within the users own building. This is a result of a

variety of conditions such as the presence of noise generating equipment like contactors, relays,

switches and fluorescent lighting, a general high power demand and the present of high inrush

loads like motors and other large inductors. Power problems also occur in the AC distribution

system as a result of distribution breakers with dirty contacts which result in high impedance, poor

connections including ground connections, incorrect grounding practices, improperly sized ground

neutral and power conductors and wiring errors. Surprisingly, wiring errors such as ground-neutral

reversals, poor or loose connections and improper wire sizes occur frequently, even in systems

which have been in use for a long period of time, and are unknowingly causing computer room

problems.

The UPS can correct all voltage problems caused by the various previously mentioned conditions

which exist up to the point of input to the UPS itself. However, if the AC distribution system which

exists between the output of the UPS and the various computer loads and peripherals has any of

the previously mentioned problems, voltage fluctuations may be re-introduced onto the clean

power generated by the UPS and, as a result, trouble with the computer system may continue. It is,

therefore, to the user’s benefit to be sure that this AC distribution system is designed and operating

properly. One would be cautioned not to assume that your AC distribution is error free, but that it be

properly analyzed by experts in that field.

Many such AC distribution systems have been designed by experts and have AC verifications

performed periodically (at least one a year) to assure that everything is operating properly, that

vibration has not loosened any connections, that circuit breakers have clean low impedance

contacts, that no loads have been added improperly and that breaker and wire current ratings have

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