Mitsubishi Electronics 9800A SERIES technical manual Static Transfer

MITSUBISHI	9800A SERIES UPS	Page Number:
ELECTRIC	OWNERS / TECHNICAL MANUAL	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.

CB		Static Transfer
AC Bypass
Input		Switch
User supplied	CB3
MCCB
RECTIFIER	INVERTER	52S
AC input		Output
CB1		52C
	CB2	Power Flow
		Not in Use
Battery cabinet		UPS Module

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.

MITSUBISHI ELECTRIC 9800A SERIES UPS