Table 2. UPS operating modes
Operating mode Description
Normal operating modes
Online mode The load is powered by the mains AC power
through rectification and inversion. In this mode,
the battery charger operates when necessary.
Energy Saver System (ESS) mode The mains supplies power to the load through the
static bypass. If there are any anomalies in the
mains, the system is able to transfer to Online
mode in less than 2 ms. In ESS mode the surge
suppression module in the system can protect the
load. Operating the UPS in ESS mode increases
system efficiency up to 99 %, allowing significant
savings in energy losses without compromising
system reliability.
Other operating modes
Battery mode A DC backup power supply provides energy that is
converted to AC power by the UPS inverter. VRLA
batteries are the most commonly used backup
power source in Battery mode.
Bypass mode AC power is directly supplied to the load through
the UPS static switch.
Power Conditioner mode The UPS operates without a DC power source
connected and the battery alarms are turned off.
The UPS provides conditioned output voltage and
frequency. It can also support high nonlinear loads
without ITHD on the input. If the rectifier is turned
off, the UPS attempts a transfer to Bypass mode.
The ESS mode is not available in this mode.
Frequency Converter mode The UPS operates without Bypass mode available
and the bypass alarms are turned off. The output
frequency can be configured to be different from
the standard input frequency (for example, 60 Hz
output and 50 Hz input). In this mode, the UPS can
also support high nonlinear loads without ITHD on
the input.
33..33..11 NNoorrmmaall ooppeerraattiinngg mmooddeess
The system includes two normal operating modes: Online mode and Energy Saver System (ESS) mode.
In a normal operating mode the system uses AC power. Online Mode is displayed on the front panel,
indicating that the incoming AC power is within the permitted voltage and frequency range.
33..33..11..11 OOnnlliinnee MMooddee
Figure 7: Path of current through the UPS in Online mode shows the path of electrical power through the
UPS system when the UPS is operating in Online mode.
EATON 93T USER’S AND INSTALLATION GUIDE 614-40270
-
December 2023 www.eaton.eu 2211
To Next Page
Loading...
