3Com Powerware Uninterruptible Power System Prestige Series - Manual (Page 9)

Introduction
3 Powerware ® Prestige Series Installation and Operator’s Manual for IBM Applications (3000 VA) Uncontrolled Copy
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. Volt-Amperes Calculation Example
If the total load requirements of the equipment exceeds the capacity of
the UPS, you must either reduce the number of pieces of 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.
Approximate Battery Times
During a power failure, the UPS battery supplies power to your
equipment, providing time to complete computing activities prior to
UPS shutdown. The duration of this time period is directly related to the
UPS battery configuration. By adding battery cabinets, you can
customize the UPS to provide enough battery time for normal processing
activities.
To prepare for a power outage at your installation, ensure that you have
sufficient battery time available. To do this, take a few minutes to
determine your approximate battery time by completing the following
steps:
Load Battery Time Load
Requirements
(VA)
UPS Model Battery Cabinets Total Battery Time
Minutes (Approximate)
Prestige 3000 (9910 EP5)
Figure 3. Determining Approximate Battery Time