ABB MegaFlex UL S1 Series - UPS Operation Modes; Normal VFI Operation Mode; eBoost Operation Mode (option)

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MegaFlex 1000 to 1600 UPS User Manual / REV-A
4.2 Operation modes
This section describes the different possible operation modes of the UPS explaining the function of the main
modules of the UPS.
4.2.1 Normal VFI Operation Mode (Voltage Frequency Independent)
Under normal conditions the Load is
permanently powered by the Inverter with
constant amplitude and frequency
.
The Rectifier, powered by the Utility, supplies
the Inverter and the
Battery-charger keeps the
Battery
fully charged.
The
Inverter converts the DC voltage in a new
AC sine wave voltage with constant amplitude
and frequency independently from the input
Utility Power.
Fig. 4.2.1-1 Block diagram normal operation mode
4.2.2 eBoost™ Operation Mode (option)
eBoost
™
e
High efficiency (up to 99.0%)
Boost
Fast power transfer (< 2ms)
When the
eBoost™ Operation Mode is
selected, and the
Utility Power is available, the
Load
is normally powered through the
Automatic Bypass
.
When the
Utility Voltage is detected out of the
prescribed tolerances, the
Load is
automatically transferred to the Inverter.
Fig. 4.2.2-1 Energy flow in eBoost™ Operation Mode
When the
Utility recovers, the Load returns to the Automatic Bypass
after a variable time defined by the control
unit.
The
eBoost™ Operation Mode can be used for single units or the RPA Parallel System, for up to 6 UPS modules,
with
all units individually able to supply power through a redundant communication bus.
The
eBoost™ Operation Mode can be configured directly by the user for higher efficiency, considering the Utility
reliability and criticality of the
Load.
The selection bet
ween the two operation modes “VFI mode and eBoost™ Operation Mode
”, or switching
between operation modes at required time, can be done through the UPS
Control Panel (see
Section 6.4 /
eBoost).
Note!
The eBoost™ Operation Mode is available only if enabled at the factory by an
ABB Service
Technician.