Figure 1.2 Single Line Diagram Bypass Operation: Load Fed Through Static Bypass Line - Mitsubishi Electric 9900CX SERIES Owner Technical Manual

B) Bypass Operation: Load Power supplied through UPS internal static bypass line.
Figure 1.2 Single Line Diagram - Bypass Operation: Load fed through static bypass line
CB
Bypass
Input
User
supplied
MCCB
CB
AC
input
User
supplied
MCCB
CB
Battery
Cabinet
External
BATTERY
Power Flow
Not in Use
Referring to Figure 1.2: The Internal Bypass line is a Hard-wired line through 52S which
supplies the critical load with unconditioned bypass input power. Upon switching to the Internal
Bypass line, the Static Transfer Switch line through CB3 (herein after STS contactor CB3)
supplies the power immediately, and then the Internal Bypass line through 52S supplies the
power. In the event of a switching to the Bypass line, the power to the critical load will be
uninterrupted. The purpose of this Internal Bypass line is to route power to the critical load while
the UPS module is de-energized (converter and inverter), and during Start-up before the system
is fully operational.
Each UPS internal static bypass line will equally share the power supplied to the critical load in
the Parallel Operation if a cable length of bypass line is equal each other. For a MMS unable to
equalize the cable length, additional rectors should be installed to compensate the difference in
cable impedance.
MITSUBISHI ELECTRIC 9900CX SERIES UPS
9900CX SERIES UPS
OWNERS / TECHNICAL MANUAL
Bypass Module
CB3
Static Transfer
CONVERTER / INVERTER
CB1
CHARGER
CB2
CONVERTER / INVERTER
CB1
CHARGER
CB2
CONVERTER / INVERTER
CB1
CHARGER
CB2
52S
Switch
52C
UPS Module
52C
UPS Module
52C
UPS Module
CABINET
Page Number:
1-10
Output
3～6 UPS
Modules
UPS