Lucent Technologies Uninterruptible Power Systems 3000 VA - Manual (Page 12)

Introduction 1
Lucent Technologies Model 3000 UPS Operator's Manual (167Ć405Ć119 Issue 3) 2
UPS Model and Battery Configurations
This UPS is designed to work with singleĆphase, threeĆwire, AC power sources.
There are two important considerations when selecting the UPS model and battery
configuration to properly safeguard your equipment:
H Load requirements
H Battery times
Load Requirements
The load is the equipment to be protected by the UPS. Select the UPS model that
meets the power consumption requirements of the load in voltĆamperes (VA). The
total load VA should not exceed the UPS VA rating. To determine the total load
requirements:
1 Obtain the load ratings from either the nameplate or operator's manual of
the equipment to be protected by the UPS. The ratings are listed in either
watts (W), amperes or amperes max (A), or voltĆamperes.
2 If the rating is in watts, multiply by 1.4 to obtain the VA requirement (this
is the typical relationship between watts and voltĆampere ratings in most
computing equipment).
If the rating is in amperes or amperes max, multiply by the input voltage to
obtain the VA requirement.
3 Add all of the resultant VA ratings together to obtain the total load
requirements of the equipment to be protected (see Figure 2).
3 COMPUTERS 3 MONITORS EXTERNAL
MODEM
3 x 200 WATTS x 1.4 = 840 VA 3 x 1 AMP x 240 = 720 VA 50 VA
840 VA + 720 VA + 50 VA = 1610 VA (Total Load Requirements)
200 WATTS
EACH
1 AMP
EACH AT 240V 50 VA
Figure 2. VoltĆAmperes Calculation Example
If the total load requirements of the equipment exceeds the capacity of the UPS, you
must either reduce the equipment, or use a UPS with a larger load capacity.
When deciding on which pieces of equipment to remove from the UPS, select
equipment that has a lower priority for power protection. Computers, monitors,
and modems typically have a higher priority because they could be processing or
transmitting data when a power outage occurs.