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1.4 OPERATION OVERVIEW
The UPS provides two power paths between the utility source and the critical load. Figure 1
shows the path for normal operation, with the load powered from the inverter. Figure 2 shows
the path for bypass operation, with the load supplied through the static bypass line.
A) Normal operation: Load power supplied by UPS inverter.
Figure 1 Single Line Diagram - Normal Operation: Load Powered by UPS Inverter
Bypass
input
AC
input
During normal operation, the path through the UPS inverter is used to power the load.
Referring to Figure 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.
WARNING: For the protection of the UPS and cables, the Bypass input
WARNING
1100B SERIES UPS
OWNERS / TECHNICAL MANUAL
UPS Module
CB
User
supplied
MCCB
CB
52RC
User
supplied
MCCB
BATTERY
circuit breaker (MCCB) is field supplied and field installed (see
WARNING 4 on page 1-8).
MITSUBISHI ELECTRIC 1100B SERIES UPS
CB 3
Static Transfer
CONVERTER /
CHARGER
INVERTER
72B
External Battery
Page Number:
1-11
52S
Switch
52 C
Output
Power Flow
Not in Use
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