Mitsubishi Electronics 2033C technical manual AC input User supplied

MITSUBISHI	2033C SERIES UPS	Page Number:
ELECTRIC	OWNERS / TECHNICAL MANUAL	1-6

FIGURE 1.2 Single Line Diagram - Bypass Operation. Load fed through static bypass line.

CB

AC input

User supplied

	Maintenance
Static Transfer	Bypass
Switch	Switch

CB3

CONVERTER INVERTER

			Output
CB1	FI	FO	52C

FB		52CS(7.5-20kVA)
		52MB&52L(30-50kVA)
CB2		Power Flow
BATTERY		Not in Use
	40kVA, 50kVA:	UPS Module
	External Battery

Referring to Figure 1.2, the Internal Static Bypass line is a Hard wired line through CB3 which supplies the critical load with unconditioned input power. The purpose of this 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.

The internal control system determines the operation of the two paths, with the load powered from the inverter being the normal operation.

Referring to Figure 1.3, if the input power is interrupted, the battery will immediately supply the DC power required by the Inverter to maintain continuous AC power to the load. A fully charged battery will provide power for the specified time at the rated load, or longer at reduced load.

When power is restored after a low battery shutdown, the Converter automatically restarts operation, recharges the batteries and the Inverter is automatically restarted without operator intervention. The load is assumed by the inverter automatically without operator intervention.

In the event of a power failure, the Converter will de-energize and the batteries will discharge into the Inverter and maintain power to the critical load until a) the battery capacity expires and the inverter turns off, or b) input power is restored after which the converter will power the inverter and simultaneously recharge the batteries. Figure 1.3 illustrates the flow diagram during battery operation.

MITSUBISHI ELECTRIC 2033C SERIES UPS