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Powerware
®
Plus 12 Operator's Manual (164200090 Rev E) 2
System Requirements
Determine the total load requirements, in voltĆamperes, of the equipment you intend to
protect with your UPS. The UPS load should not exceed the UPS rating. See Figure 1
and the following procedure to determine the total load requirements:
. Obtain the load ratings from either the nameplate or operator's manual of the
equipment you intend to protect. The ratings are listed in either watts (W),
amperes or amperes max (A), or voltĆamperes (VA).
. If the rating is in watts, multiply by 1.4 to obtain the VA requirement (this is the
typical relationship between watts and voltĆamperes ratings in most computing
equipment).
If the rating is in amperes or amperes max, multiply by the input voltage (200, 208,
220, 230, or 240 VAC) to obtain the VA requirement.
. Add all of the resultant VA ratings together to obtain the total load
requirements of the equipment to be protected.
3 COMPUTERS 3 MONITORS EXTERNAL
MODEM
3 X 100 WATTS X 1.4 = 420 VA 3 X 2 AMPS X 208 = 1248 VA 50 VA
420 VA + 1248 VA + 50 VA = 1718 VA (Total Load Requirements)
100 WATTS 2 AMPS
50 VA EACH EACH
If the total load requirements of your protected equipment exceeds the capacity of your
UPS, you must either reduce the number of pieces of equipment you are protecting, or
use a UPS with a larger load capacity.
When deciding on which pieces of equipment to remove from UPS protection,
remember that printers generally have a lower priority. Computers, monitors, and
modems typically have a higher priority because they could be processing or
transmitting data when a power outage occurs.