Rackmount Solutions XRT Series - Manual (Page 9)

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2. SYSTEM DESCRIPTION
The XRT series of Uninterruptible power supplies are based on an
advanced true sinewave power system that filters and protects the
electronic equipment from all types of power line problems. The various
models provide from 600 VA to 2000 VA of power for voltage ranges of
120 VAC, 208 VAC and 240 VAC single phase 60 Hz. units, and 220
VAC through 240 VAC 50 Hz. units. At all power levels and voltage
ranges the load is protected against AC line spikes, surges, dropouts,
brownouts and blackouts. All 60 Hertz models include electrical isolation
from the power line to the AC load. During operation, all of the critical
parameters are continuously monitored. The parameters may be
monitored at the UPS with an LED display on the XRT600, or with a
sophisticated LCD display that contains 32 characters on the XRT1000
and larger units. In all models the communications port can be used with
the Minuteman Sentry or PowerMon software to report all of the critical
parameters as well as controlling the UPS’s functions via remote control.
Built in is the provision for a remote master Output Power OFF switch so
that a user-supplied power down switch or relay can immediately shut off
the output power.
The XRT series of UPS’s are “Line-Interactive”. That is, during normal
operation from the AC line, the line AC is passed through an isolation
transformer
*
and filtering system that provides the maximum efficiency,
safety and reliability. During normal AC operation, the incoming line
voltage is continuously monitored and automatic correction is made for
under-voltage or over-voltage conditions. This provides AC line correction
for a range of 75% to 116% of the nominal line voltage. When these
limits are exceeded, or if the line frequency varies more than plus or
minus 3 Hertz, the unit automatically switches to battery power until
normal AC is restored. In normal operation the battery is continuously
charged so that full battery power is always available.
*
Isolation transformer is on the 60 Hz. units only.