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MITSUBISHI ELECTRIC 9800A SERIES UPS
MITSUBISHI
ELECTRIC
9800A SERIES UPS
OWNERS / TECHNICAL MANUAL
Page Number:
1-6
The Bypass Input circuit breaker (MCCB) for protection of the UPS and cables are field
supplied and field installed. (See WARNING 2 on page 1-2)
B) Bypass Operation: Load Power supplied through each system UPS internal static
bypass line.
FIGURE 1.2 Single Line Diagram - Bypass Operation: Load fed through Internal static
bypass line.
Referring to Figure 1.2: The Internal Static Bypass line is a Hard wired line through CB3
and contactor 52S which supplies the critical load with unconditioned input power.
Each system UPS internal static bypass line will equally share the power supplied to the
critical load.
The internal static bypass line will route power to the critical load while the UPS module is
de-energized during Start-up and before the system is fully operational.
Bypass operation will occur In the event of a load overcurrent, with all system UPS
transferring to bypass without interruption to the critical load.
The internal control system determines the operation of the two paths, with the load
powered from the inverter being the normal operation.
CB1
Static Transfer
Switch
AC Bypass
In
put
AC input
CB
CB3
52S
52C
User supplied
MCCB
UPS Module Battery cabinet
CB2
Power Flow
Not in Use
RECTIFIER
INVERTER
Output