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LX: OPM_LPU_11U_5K0_10K_1US_V030 8 GE DE LP 11U UPS: Installation / User Manual 3.0 (US)
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3.4 Automatic 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.’
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.
3.5 Manual 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.
Figure 4 . Bypass operation: Automatic bypass
Figure 5 . Bypass operation: Manual bypass
BYPASS
FILTER
P.F. = 1
CONVERTER/
RECTIFIER/
BATTERY
CHARGER
BACKFEED
PROT.
OPTIONAL
BATTERY
EXTENSION
BATTERY
MICROPROCESSOR CONTROL
SYSTEM
ON/OFF
OUTPUT
CONVERTER
MANUAL BYPASS
SWITCH
UTILITY INPUT
RFI
FILTER
OPTION
SLOTS FOR:
RPA CARD
SNMP CARD
RELAY CARD
STANDARD
INSTALLED:
RS232/
CONTACT
INTERFACE
FRONT
PANEL
TO LOAD
RFI
FILTER
STATIC
BYPASS
OUTPUT
TRANSFORMER
BYPASS
FILTER
P.F. = 1
CONVERTER/
RECTIFIER/
BATTERY
CHARGER
BACKFEED
PROT.
OPTIONAL
BATTERY
EXTENSION
MICROPROCESSOR CONTROL
SYSTEM
ON/OFF
OUTPUT
CONVERTER
MANUAL BYPASS
SWITCH
UTILITY INPUT
RFI
FILTER
OPTION
SLOTS FOR:
RPA CARD
SNMP CARD
RELAY CARD
STANDARD
INSTALLED:
RS232/
CONTACT
INTERFACE
FRONT
PANEL
TO LOAD
RFI
FILTER
STATIC
BYPASS
OUTPUT
TRANSFORMER