Powerware E.T.N 1500 VA - 60kVa - Manual (Page 8)

 EATON CORPORATION Reference Guide & Price Book
Our approach to power protection revolves around the nine most
common power problems present in any work environment. You can
choose from a variety of power protection devices with varying levels
of effectiveness and price that will shield critical data and equipment
from some or all of the nine power problems.
There are three types of UPS: Series 3, Series 5, and Series 9. To
choose the UPS that is right for your customer, first determine the
level of power protection that is needed. It is obvious that the ideal
is to provide the full protection from all power problems afforded by
a Powerware Series 9 UPS. But there may be applications where the
power quality is known to be high, or where the load is not considered
critical, or where budget considerations force a compromise.
What the Experts Say:
Institute of Electrical and Electronic Engineers (IEEE)
Power equipment is susceptible to mis-operation caused by harmonic
distortion. General harmonic distortion limits are recommended in IEEE
Table 3.3.1 for systems operating at less than 69 kV: less than 5.0%
voltage total harmonic distortion (THD) and less than 3.0% individual
harmonic voltage distortion.
Series 3 UPS
The Series 3 UPS offers a low-price solution to environments requiring
minimal power protection. Utility power is provided during normal
operation. Harmonic distortion present in the utility line passes through
to the load.
Series 5 UPS
Series 5 UPSs provide basic power protection at mid range prices.
Line-interactive UPSs provide more voltage regulation than off-line.
Harmonic distortion, however, passes through unaffected.
Series 9 UPS
Series 9 UPSs are ideally suited to protect critical equipment. Online
UPSs protect against all types of power problems and continuously
use the inverter to create clean, new, regulated power. Harmonic
distortion, no matter how high, cannot pass through to the load.
Powerware Series 9 UPSs isolate equipment from harmonic distortion
and are strongly recommended for critical applications that must meet
the 5% maximum harmonic requirement stated in major computer
manufacturer specifications and installation guides.
VTHD in 9% VTHD Out <5%
VTHD in 9% VTHD Out 9%
VTHD in 9% VTHD Out 9%
SELECTING A UPS
Which UPS is Right for Your Customer?