GE LP11U user manual Functional Explanation, Principles of Operation

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Digital Energy™ LP Series

3 - Functional Explanation

3.1The Principles of Operation

The UPS stores electric energy in batteries. This allows the UPS to supply output power even when the incoming utility power is cut off completely.

Energy is stored as Direct Current (DC), while input and output energy must be Alternating Current (AC). Therefore the UPS contains an input converter (AC to DC) and an output converter (DC to AC). (fig.2)

3.2Normal Conditions

Under normal conditions, energy from the utility is channeled through the input converter, which supplies the output converter and the battery charger. The batteries are kept in a fully charged state, and the output converter synthesizes a completely new AC output sine wave to supply the load (electrical equipment).

INPUT:				OUTPUT:
MAINS POWER WITH DISTURBANCES				PERFECT UPS POWER
				MANUAL BYPASS
				SWITCH
		BYPASS	STATIC
		FILTER	BYPASS
UTILITY INPUT					RFI	TO LOAD
					FILTER
		P.F. = 1				OPTION
RFI	BACKFEED	CONVERTER/	OUTPUT			SLOTS FOR:
FILTER	PROT.	RECTIFIER/	CONVERTER			RPA CARD
		BATTERY
		CHARGER		OUTPUT		SNMP CARD
				TRANSFORMER
	OPTIONAL					RELAY CARD
			SYSTEM	FRONT		STANDARD
		BATTERY		PANEL		INSTALLED:
			ON/OFF
	BATTERY					RS232/
						CONTACT
	EXTENSION					INTERFACE

MICROPROCESSOR CONTROL

Figure 2. Block diagram of the LP 11U UPS, utility present

3.3Utility Failure

In the event of a utility power failure (i.e. absent or outside tolerance) the system uses the energy reserve stored in the battery to continue to produce AC power, ensuring unbroken output (fig. 3). No interruption or alteration will ever be noticed in the output power.

In the event of an extended utility failure, the output converter will stop when the battery has been discharged. At this point, the UPS is no longer able to power the connected equipment.

When the utility is re-established within tolerance, the output converter will be supplied again by the input converter and the batteries will be recharged, making them ready to support future power failures.

NO INPUT:				OUTPUT:
UTILITY FAILURE				PERFECT UPS POWER
				MANUAL BYPASS
				SWITCH
		BYPASS	STATIC
		FILTER	BYPASS
					RFI	TO LOAD
					FILTER
		P.F. = 1				OPTION
RFI	BACKFEED	CONVERTER/	OUTPUT			SLOTS FOR:
FILTER	PROT.	RECTIFIER/	CONVERTER			RPA CARD
		BATTERY
		CHARGER		OUTPUT		SNMP CARD
				TRANSFORMER
	OPTIONAL					RELAY CARD
			SYSTEM	FRONT		STANDARD
		BATTERY		PANEL		INSTALLED:
			ON/OFF
	BATTERY					RS232/
						CONTACT
	EXTENSION					INTERFACE

MICROPROCESSOR CONTROL

Figure 3. Block diagram of the LP 11U UPS, utility failure

LX: OPM_LPU_11U_5K0_10K_1US_V030 7 GE DE LP 11U UPS: Installation / User Manual 3.0 (US)