1Introduction
UPS Model and Battery Configurations
This UPS is designed to work with single?phase, three?wire, AC power sources. There are two important considerations when selecting the UPS model and battery configuration to properly safeguard your equipment:
Load requirements
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 volt?amperes (VA). The total load VA should not exceed the UPS VA rating. To determine the total load requirements:
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 volt?amperes.
If the rating is in watts, multiply by 1.4 to obtain the VA requirement (this is the typical relationship between watts and volt?ampere ratings in most computing equipment).
If the rating is in amperes or amperes max, multiply by the input voltage 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 (see Figure2).
| 3COMPUTERS |
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| 3MONITORS |
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| 200WATTS |
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| 1AMP |
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| EACH |
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| EACHAT240V |
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3x200WATTSx1.4=840VA | 3x1AMPx240=720VA | ||||
EXTERNAL
MODEM
50VA
50VA
840VA+720VA+50VA=1610VA(TotalLoadRequirements)
Figure 2. Volt#Amperes 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.
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