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|  DOE-STD-3003-2000
verify that the rectifier can
5.3.2.2 Routine inspections and
instantly sustain the critical loads
servicing of UPS systems. UPS systems
and re-charge batteries (if used).
should be checked externally daily. The UPS
Verify inverter voltage & frequency
should be checked for evidence of problems
remains within specified limits.
by evaluating meter readings and detrimental
environmental problems (heat, moisture,
e.
Transfer Test - (For UPS systems
chemicals). Less frequent activities such as
which use a Static Bypass Switch)
internal cleaning, filter replacement, checking
Cycle the UPS to and from the
electrical connections for tightness, and
bypass source, measuring
calibration of instruments shall be done
transients, maximum & minimum
according to manufacturer's recommend-
voltages and transfer times.
ations or at least every 18 months. This
Simulated failures may be
interval may be adjusted according to
needed.
documented operating experience.
f.
Rated Full-Load Test - Loads
5.3.3 Testing of UPS systems. A UPS
(equivalent to the full-rated load)
in its standby or normal operating mode may
shall be applied to the output of
not demonstrate many of the various features
the UPS at the extreme ranges of
that may be required to function during
ac and dc input voltages for rated
emergency conditions such as a loss-of-
duration.
power or equipment failure. Depending on
the design of the UPS system, the following
g.
Output-Voltage Balance Test -
tests should be performed:
Measure inverter phase-to-phase
& phase-to-neutral voltages and
a.
Light-load Test - Verify inverter
angles while symmetrical loads
voltage & frequency remains
are applied. Measure inverter
within specified limits. Verify
phase-to-phase &
proper operation of control
phase-to-neutral voltages and
switches & meters.
angles during the transition from
no-load to an imbalanced full load.
b.
SYNCHRONIZATION Test -
Measure the rate of change of
h.
Harmonic-Components Test -
inverter frequency while a
measure harmonic content in the
reference frequency is attenuated.
output voltage for rated linear and
Concurrently measure the inverter
nonlinear load conditions.
voltage. (only required when
synchronization with alternate
The tests above correspond to tests
source is a design feature)
recommended by ANSI/IEEE Std 944 and
should be performed according to
c.
AC Input Failure Test - Disconnect
manufacturer's recommendations or on at
the input power source(s) or
least an 18-month interval. UPS batteries
shutdown the rectifier on-line to
shall be maintained and tested in accordance
verify that the dc source can
with 5.4.
indeed instantly sustain the critical
loads. Verify inverter voltage &
5.4 STATIONARY BATTERY system
frequency remains within specified
limits.
requirements. A STATIONARY BATTERY
system is a direct current (dc) standby power
d.
AC Input Return Test -Restore the
system consisting of a group of two or more
input power source(s) or
cells connected together electrically in series
reactivate the rectifier on-line to
or parallel, or combination. A system includes
17
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