Table of Contents
Advertisement
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 inverters
AC Bypass
Input
User supplied
Breaker
AC input
CB1
During normal operation, the path through the UPS inverters is used to power the load.
In Figure 1.1 for each system UPS, the Input AC power is converted to DC by the Rectifier.
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.
In a parallel system the power drawn by the critical load is equally shared between all
system UPS. In the event of a UPS module failure, the critical load power will be continually
supplied and shared by all other system UPS.
In the event of a load overcurrent, all system UPS will transfer to bypass without interruption
to the critical load.
8
CB
RECTIFIER
Battery cabinet
Static Transfer
Switch
CB3
INVERTER
52S
52C
CB2
Power Flow
Not in Use
UPS Module
G8000MM
Installation and Operation Manual
Output
Advertisement
Table of Contents
