2.3
UPS SYSTEM RATINGS
Unless stated otherwise, the parameters listed are under full output load
at [0.8] [0.9] power factor, with batteries fully charged and floating on
the dc bus and with nominal input voltage.
2.3.1
System Capacity
**************************************************************************
NOTE: System capacity for single module UPS is same
as module capacity. For multi-module UPS, select
required redundancy. Parallel redundant UPS are
usually N+1 redundant, where N is the number of
modules needed to carry the full load.
**************************************************************************
Overall [_____] kVA, [_____] kW, [non] [N+1] [N+2] redundant, at [40] [50]
degrees C.
2.3.2
Module Capacity
[_____] kVA, [_____] kW.
2.3.3
Battery Capacity
**************************************************************************
NOTE: Typical battery discharge times are 5, 10,
12, 15, and 30 minutes. If no emergency source is
available, longer battery discharge time may be
required.
**************************************************************************
Discharge time to end voltage: [15] [_____] minutes, at 25 degrees C 77
degrees F. Battery shall be capable of delivering 125 percent of full
rated UPS load at initial start-up.
2.3.4
Static Switch
**************************************************************************
NOTE: The interrupting capacity requirements must
be determined for each project distribution system.
**************************************************************************
[_____] amperes, [_____] amperes symmetrical interrupting capacity.
2.3.5
System Bus Bracing
Braced for [_____] amperes symmetrical interrupting capacity.
2.3.6
ac Input
**************************************************************************
NOTE: Total harmonic current distortion (THD) is
usually specified as follows: modules 15-224 kVA 10
percent; modules above 225 kVA 5 percent. If UPS
will be supplied from a generator, the generator
capacity must be at least twice the UPS capacity if
THD exceeds 5 percent.
**************************************************************************
SECTION 16265A
Page 17
Previous Page
