GE LP11U user manual Automatic Bypass Switch

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Digital Energy™ LP Series

3.4Automatic Bypass Switch

If the output converter is unable to deliver the demanded output power because of overload or overtemperature, the automatic bypass switch will automatically transfer the load to the utility. When the situation is corrected the UPS will switch back to normal operation, i.e. the load is tranferred back to the output converter. Though the automatic bypass switch is shown as a simple mechanical switch in figures 2-5, the transfers are done by means of thyristors, i.e. electronically, without any interruption of the power supplied to the load.

In case of a severe overload or short-circuit the magnetic bypass circuit breaker (rear panel) may trip in order to protect the UPS. If the current is insufficiently high to trip the breaker, the UPS will be switched off by the software in order to protect the UPS and connected equipment.’

				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 4 . Bypass operation: Automatic bypass

If a power failure occurs during bypass operation, load power may be lost. If the UPS functions under overload conditions it may not be able to protect the load.

3.5Manual Bypass Switch (Service switch)

The system can be bypassed manually using the manual bypass switch located at the rear panel. It is a two- position switch: the normal position is '1': as in figures 2-4. Position '2' is the service position: the load is directly connected to the utility input. This way maintenance of the UPS (e.g. battery replacement, as in fig. 5) is possible without interruption of the power supplied to the load.

CAUTION: REFER SERVICE TO QUALIFIED PERSONNEL ONLY.

THE RFI FILTERS AND OUTPUT TRANSFORMER ARE ALWAYS ACTIVE.

				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
				PANEL		INSTALLED:
			ON/OFF
	BATTERY					RS232/
						CONTACT
	EXTENSION					INTERFACE
			MICROPROCESSOR CONTROL

Figure 5 . Bypass operation: Manual bypass

LX: OPM_LPU_11U_5K0_10K_1US_V030 8 GE DE LP 11U UPS: Installation / User Manual 3.0 (US)