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MITSUBISHI ELECTRIC 9800A SERIES UPS systems User Manual

Page 12

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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

Input

AC input

CB

CB3

52S

52C

User supplied
MCCB

UPS Module

Battery cabinet

CB2

Power Flow

Not in Use

RECTIFIER

INVERTER

Output