Introduction

3.Add all of the resultant VA ratings together to obtain the total load requirements of the equipment to be protected (see Figure 2). If the load consists of the power-factor corrected supplies, it is recommended to use total watts for the load requirements.

 

3 COMPUTERS

 

 

3 MONITORS

 

EXTERNAL

 

300 WATTS

 

 

2 AMPS

 

MODEM

 

 

 

 

 

 

EACH

 

 

EACH

 

50 VA

 

 

 

 

 

 

 

3 x 300 WATTS X 1.4 = 1260 VA

3 x 2 AMPS x 240V = 1440 VA

50 VA

1260 VA + 1440 VA + 50 VA = 2750 VA (Total Load Requirements)

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.

Battery Times for the Prestige 6000

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.

Load (VA)

Load (W)

 

Average Battery Time (in Minutes)

 

 

at 0.67 PF*

2 Cabinets

3 Cabinets

4 Cabinets

5 Cabinets

6 Cabinets

 

 

 

6000

4000

5

9

14

21

25

 

 

 

 

 

 

 

 

 

4500

3000

7

14

22

27

32

 

 

 

 

 

 

 

 

 

3000

2000

14

24

32

39

47

 

 

 

 

 

 

 

 

 

1500

1000

30

44

58

72

87

 

 

 

 

 

 

 

 

 

*Typical Power Factor (PF)

Powerware® 9 Prestige Series User’s Guide (4500/6000 VA) S Rev H www.powerware.com

3