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DOE-SPEC-3021-97
specified float charge voltage. Following a prolonged discharge of
the battery (see paragraph 3.3.3.6, below), the output voltage shall
provide the option of automatically switching to the battery
manufacturer's specified equalize charge voltage for a period of time
set by the timer specified in paragraph 3.3.3.6, below or continue
charging at the predetermined float level.
Charge timers. The rectifier/charger shall be equipped with two
3.3.3.6
automatic equalization charge timers to control the output voltage.
Timer 1 shall be a fixed two-minute timer that prevents application of
an equalization charge if the ac input power loss is less than two
minutes. Timer 2 shall be an adjustable timer that can be selected
from 0 to 72 hours in increments of 1 hour. This timer shall initiate
and control the length of the equalization charge. At the end of the
equalization charge time the charger shall automatically revert to
float charge. [Also provide manual equalization capability.]
Temperature compensation. The rectifier/charger shall be equipped
3.3.3.7
with temperature compensation controls to limit current drawn by
the battery string dependent on the battery cell(s) skin temperature.
3.3.3.8
Filtering. The rectifier/charger shall limit ac ripple voltage on the dc
bus to 5% maximum of the rated ac input voltage.
3.3.3.9
Recovery control. The rectifier/charger shall include circuits and
controls to recover gradually, following a loss of ac input power.
This "walk in" circuit shall control the dc output from 0-100% of
normal operation over a period of less than 60 seconds. The output
voltage shall be increased gradually until it reaches the required
charge voltage or current limiting takes place.
3.3.4
Battery power supply. In the event that the battery is disconnected for
maintenance, the UPS shall continue to operate in a power-conditioning mode
and the output characteristics of the UPS shall not be degraded. Upon failure of
the normal source for the UPS system, the load shall continue to receive power
from the dc system, which shall have the following characteristics:
ATTENTION:
The following information concerning the backup battery must be obtained from the DOE Standard "Sealed
Valve-Regulated Lead-Acid Storage Batteries" or "Flooded-Type Lead-Acid Storage Batteries." Remember - the
short-circuit current capability of a sealed, valve-regulated battery is higher than the same size flooded-cell
battery. If a new battery system is purchased with the UPS system, items b. through e. may be provided by the
battery manufacturer at a later date.
********************
]
a. Battery Type:
[
b. Nominal Voltage,
Ungrounded:
[
] [To be provided by battery
manufacturer]
15


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