7
4. OPRESENTATION.
4.1. SYSTEM CONFIGURATION
The Modular UPS is configured by the following part: Power
modules, Bypass & Monitoring module, and cabinet with
manual Bypass switch. One or several battery strings should
be installed to provide backup energy once the utility fails. The
UPS structure is shown in Fig. 1.
.
Rectifier
AC/DC
Main
Static Bypass
Manual Bypass
Inverter
DC/AC
Charge/
Discharge
Output
Battery
Bypass
Fig. 1.
UPS Configuration
4.2. POWER MODULE
The power module structure is shown as Fig. 2. The power
module contains a rectifier, an inverter, and a DC/DC converter
for charge and discharge of the external batteries.
Rectifier
AC/DC
Inverter
DC/AC
DC/DC
Input
Battery
Output
Fig. 2.
Power module structure
4.3. OPERATION MODE
The Modular UPS is an on-line, double-conversion UPS that
permits operation in the following modes:
•
Normal mode
•
Battery mode
•
Bypass mode
•
Maintenance mode (manual bypass)
•
ECO mode
•
Auto-restart mode
•
Frequency Converter mode
4.3.1. Normal Mode
The inverter of power modules continuously supply the critical
AC load. The rectifier/charger derives power from the AC mains
input source and supplies DC power to the inverter while si-
multaneously FLOAT or BOOST charging its associated backup
battery.
Rectifier
AC/DC
Main
Static Bypass
Manual Bypass
Inverter
DC/AC
Charger
DC/DC
Output
Battery
Bypass
Fig. 3.
Normal mode operation diagram
4.3.2. Battery Mode
Upon failure of the AC mains input power, the inverter of power
modules, which obtain power from the battery, supply the
critical AC load. There is no interruption in power to the crit-
ical load upon failure. After restoration of the AC mains input
power, the” Normal mode” operation will continue automati-
cally without the necessity of user intervention.
Rectifier
AC/DC
Main
Static Bypass
Manual Bypass
Inverter
DC/AC
Discharge
DC/DC
Output
Battery
Bypass
Fig. 4.
Battery mode operation diagram
Note:
With the function of Battery cold start, the UPS may start without
utility. See more detail in section 8.1.2.
ADAPT
UNINTERRUPTIBLE POWER SUPPLY
USER'S MANUAL