Operation Overview; Figure 1.1 Single Line Diagram-Normal Operation: Load Powered By Ups Inverter - Mitsubishi Electric 9900D 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
CB
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.
9900D SERIES UPS
OWNERS / TECHNICAL MANUAL
Bypass Module
CB 3
CONVERTER / INVERTER
CB 1
CHARGER
CONVERTER / INVERTER
CB 1
CHARGER
CONVERTER / INVERTER
CB 1
CHARGER
MITSUBISHI ELECTRIC 9900D SERIES UPS
52 S
Static Transfer
Switch
52 C
UPS Module
52 C
UPS Module
52 C
UPS Module
Page Number:
1-7
Output
–
3 5UPS
modules
UPS
CABINET