Operation Overview; Figure 1.1 Single Line Diagram-Normal Operation: Load Powered By Ups Inverter - Mitsubishi Electric 9900CX SERIES Owner Technical Manual

1.4 OPERATION OVERVIEW

The UPS provides two power paths between the utility source and the critical load.
Figure 1.1 shows the path for normal operation, with the load powered from the inverter. Figure
1.2 shows the path for bypass operation, with the load supplied through the static bypass line.
A) Normal operation: Load power supplied by each system UPS inverter.
Figure 1.1 Single Line Diagram - Normal Operation: Load powered by UPS inverter
CB
Bypass
Input
Output
supplied
MCCB
CB
AC
input
User
supplied
MCCB
Battery
Cabinet
External
BATTERY
Power Flow
Not in Use
During normal operation, the path through the UPS inverters is used to power the load.
Referring to Figure 1.1: Input AC power is converted to DC by the Converter. DC power is
utilized to charge the UPS battery and to provide power to the Inverter. The Inverter converts
the DC power to clean AC power to supply the critical load.
The conversion - inversion process eliminates any voltage transients or fluctuations existing in
the input power before it reaches the critical load.
9900CX SERIES UPS
OWNERS / TECHNICAL MANUAL
Bypass Module
CB 1
CB2
CB
CB 1
CB2
CB 1
CB2
MITSUBISHI ELECTRIC 9900CX SERIES UPS
52S
CB3
Static Transfer
Switch
CONVERTER / INVERTER
CHARGER
UPS Module
CONVERTER / INVERTER
CHARGER
UPS Module
CONVERTER / INVERTER
CHARGER
UPS Module
Page Number:
1-8
52C
Output
52C
3～6 UPS
modules
52C
UPS
CABINET