Uninterruptible Power System 800 Guía de instalación descargar pdf (Pagina 7)

PROPERTY OF SOLIDSTATE CONTROLS, INC. 7/1998

A single phase UPS with a 120 V output can supply only a 120 V load. However, a three phase

UPS with a 208Y/120 V output can supply either a 120 V single phase load, a 208 V two phase

load, a 208 three phase load, or a 208Y/120 V, three phase load.

In determining the size of a three phase UPS, single phases loads can be distributed between

each of the three phases. However, one large single phase load can be connected to only one

phase of a three phase UPS. This one load may well determine the size of the system, even

though the other loads may be very small.

75.0 amp 1.5 amp 12.0 amp

.5 amp 5.0 amp

3.5 amp 1.5 amp

7.0 amp

2.5 amp

5.0 amp

3.0 amp

75.0 5.0 2.5 1 phase loads

7.0 3.0 1 phase loads

3.5 1 phase loads

0.5 1 phase loads

1.5 1.5 2 phase loads

12.0 12.0 12.0 3 phase loads

1.5 1.5 1.5 3 phase loads

5.0 5.0 5.0 3 phase loads

93.5 32.5 29.5

The actual minimum kVA required is calculated by multiplying the highest phase current times the

line-to-neutral voltage, times three, divided by 1000.

kVA = Amps (highest) x Voltage (line-to-neutral) x 3

` 1000

kVA = 93.5 x 120 x 3 = 33.66 kVA

100

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Uninterruptible Power System 800 Guía de instalación Pagina 7