Eaton 93E, Инструкция по установке и эксплуатации, Страница: 73 / 133

Eaton 93E UPS 15-80 kVA (380/400/415 V) Installation and Operation Manual
© Eaton Corporation plc 2015. All rights reserved. Revision: 001
Document ID: 614-01975-00
74 (133)
6.2.1 Modes
The Eaton 93E UPS supports a critical load in four different modes of
operation:
• In the standard normal mode, the critical load is supplied by the
inverter, which derives its power from rectified utility AC power. In
this mode, the battery charger also provides charging current for the
battery, if needed, the standard mode is the standard normal
operating mode.
•
In the high-efficiency (HE) mode, commercial AC power is supplied
directly to the critical load through the internal bypass. If an
abnormal condition is detected, the UPS transfers automatically to
the standard normal mode (double-conversion on demand).
•
In the bypass mode, the critical load is supported by the bypass
source.
•
In the battery mode, the battery provides DC power, which
maintains inverter operation. The battery supports the critical load.
The following sections describe the differences in the UPS operating
modes, using block diagrams to show the power flow during each mode
of operation.
6.2.2 Standard normal mode
During the standard normal mode, power for the system is derived from
a utility input source through the rectifier input relay. 3-phase AC input
power is converted to DC using IGBT devices to produce a regulated DC
voltage to the inverter. When the battery relay is closed, the battery is
charged directly from the regulated rectifier output through a buck or
boost DC converter, depending on the system voltage and the size of
the battery string attached to the unit.
Figure 30 shows the path of electrical power through the UPS system
when the UPS is operating in the normal mode.