Eaton Electrical 9390 - Manual (Page 4)

4 EATON CORPORATION Eaton 9390 Uninterruptible Power System
Energy efficiency means substantial cost savings
All UPSs consume energy to operate, and some unused energy is dissipated as heat as it passes through the UPS—the more heat
and dissipated energy, the higher cost of operation. The efficiency rating of a UPS measures how little energy is wasted.
For exam-
ple, a 90% efficient UPS delivers 90 kW of useful power for every 100 kW taken in. With a transformerless design and sophisticated
sensing and control circuitry, the 9390 delivers an efficiency of up to 94 percent with double-conversion protection. In addition to the
cost savings, this enhanced efficiency extends battery runtimes and produces cooler UPS operating temperatures, extending compo-
nent life and increasing reliability and performance.
Comparison of 90% versus 94% efficient 80 kVA UPS
Percent Wasted kW Cost per kWh Extra energy Extra air Annual savings vs.
efficiency hours* and demand cost conditioning cost less-efficient model
90 63,072 $0.13 $8,199 $5,740
94 37,843 $0.13 $4,919 $3,444 $5,576
* Mostly dissipated as heat.
Power performance
Input THD Output PF Efficiency
Eaton 9390 <4.5% 0.9 94%
Competitor “A” <7.5%* 0.8 92.5-93%
Competitor “B” <10%* 0.8 90-95%
Competitor “C” <10%* 0.8 92-93%
Competitor “D” <7%* 0.8 87-93%
Competitor “E” <7%* 0.8 90-93.3%
Competitor “F” <3% 0.8 88.5-94%
Competitor “G” <3-7% 0.8 87% (estimated)
*w/filter (~30% w/out)
80
100
160 kVA @ 480V
100 90 80 70 60 50 40 30 20 10
82
84
86
88
90
92
94
96
98
94.65%
% Load
Eaton 9390 160 kVA Efficiency Curve
% Ef
ficiency
Operational savings
Efficiency comparison
Efficiency difference: 2% 3% 4%
1 year 5 years 1 year 5 years 1 year 5 years
Savings–80 kVA UPS $2,788 $13,940 $4,182 $20,910 $5,576 $27,880
Savings–160 kVA UPS $5,576 $27,880 $8,363 $41,815 $11,151 $55,755
CO
2
Savings–80 kVA 19.3 tons 96.5 tons 23.1 tons 115.5 tons 26.9 tons 134.5 tons
CO
2
Savings–160 kVA 26.9 tons 134.5 tons 34.5 tons 172.5 tons 42.2 tons 211 tons
Alternative voltages for IT data center powering
In addition to conventional (208 and 480) voltage capabilities, the 9390 now has the ability to support direct-
connect 400/230 Vac for powering directly to the IT rack. This capability allows for the deployment of a UL/CE
rated UPS that can protect and distribute 400/230 Vac directly to IT racks without an additional step-down
transformer. Some of the efficiencies and benefits of this alternative voltage powering are:
• Elimination of the step-down 480-208 volt transformer lowers heat losses and saves valuable floor space
in the data center
• Higher voltage directly to IT equipment allows it to operate at higher efficiency (no changes required, as
virtually all servers are rated to operate at up to 240 Vac)
• No changes to power distribution equipment since connectors and circuit breakers already exist with
these ratings
• The use of Eaton’s high efficiency 9390 UPS in such an application further improves system overall efficiency.
• Multiple studies show that up to 5% overall efficiency gains can be made versus equivalent 480 or 208 Vac
systems, resulting in thousands of dollars in savings per year.