MITSUBISHI ELECTRIC 9700 Series - Manual (Page 10)

MITSUBISHI
ELECTRIC 9700 SERIES UPS
OWNERS / TECHNICAL MANUAL
Page Number:
1-3
MITSUBISHI ELECTRIC 9700 SERIES UPS
1.2 Overview
The UPS provides two power paths between the utility source and the critical load as
shown in figures 1.1 and 1.2.
A) Through the UPS Module (FIGURE 1.1)
FIGURE 1.1 Single Line Diagram - Normal Operation
When the load is on the Inverter, the internal control system determines which of the two
paths supplies power to the load. During normal operation, the path through the UPS
module is used.
Input AC power flows through the UPS where it is converted to DC by the Converter /
Charger. This 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 Bypass Input circuit breaker (MCCB) for protection of the UPS and cables is field
supplied and field installed. (See WARNING 2 on page iv)
Static Transfer
Switch
AC Bypass
Input
Output
AC input
CB
CB3
52S
52C
Use supplied
MCCB
UPS Module Battery cabinet
CB1
CB2 Power Flow
Not in Use
CONVERTER INVERTER