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Digital EnergyLP 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)

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GE LP11U user manual Automatic Bypass Switch