Operation Overview; Figure 1.1 Single Line Diagram-Normal Operation - Mitsubishi Electric M9950 Series Technical Manual

MITSUBISHI
ELECTRIC

1.4 OPERATION OVERVIEW

The UPS provides two power paths between the utility source and the critical load.
F 1.1 shows the path for normal operation, with the load powered from the inverter.
IGURE
F 1.2 shows the path for bypass operation, with the load supplied through the static
IGURE
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
52RS
Bypass
input
User
supplied
52R
AC input
User
supplied
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.
The power drawn by the critical load is equally shared between all UPS whenever the
system is in the Parallel Operation. (Refer to FIGURE 3.4 that shows a sample of Parallel
Operation System Configuration.)
M9950 SERIES UPS
OWNERS / TECHNICAL MANUAL
52M
52PS
CONVERTER
/ CHARGER
52RC
UPS Module
Battery Cabinet
External
BATTERY
MITSUBISHI ELECTRIC M9950 SERIES UPS
Bypass
Switch
INVERTER
52C
Power Flow
Not in Use
72B
Page Number:
1-7
52L
Output