OPTI-UPS DS120KC33 - Manual (Page 17)

2-4-3 System is powered by battery (fig.2-4-3)
Load
Battery
Pack
+ -
Utility
S3
Input
protection
Input
switch
Manual bypass switch
S6
S.T.S. Rectifier
S4
Battery
switch
Inverter Transformer
S5
Output
switch
S1
Battery
auxility
switch
AC choke DC choke
Fig. 2-4-3
In the absence of the utility input, the rectifier stops and DC power is supplied by the batteries to the
inverter module. The inverter converts the DC into AC. The static switch connects the inverter
output to the load. At this time, the inverter supplies the load. When power is supplied by the batteries,
the back up time depends on number of batteries and load level.
2-4-4 System Diagram for manual maintenance bypass mode (shown as fig. 2-4-4)
Load
Battery
Pack
+ -
Utility
S3
Input
protection
Input
switch
Manual bypass switch
S6
S.T.S. Rectifier
S4
Battery
switch
Inverter Transformer
S5
Output
switch
S1
Battery
auxility
switch
AC choke DC choke
Fig. 2-4-4
Utility AC input flows through the manual maintenance switch directly to the output load. At this time
power is supplied by utility. In this mode, a technician can repair or maintain and clean the UPS.