
LX: OPM_LPA_11U_5K0_10K_1US_V021
7
GE DE LanPro-11U UPS: Installation / User Manual 2.1 (US)
GE Digital Energy
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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
OUTPUT
RFI
FILTER
BYPASS
FILTER
STATIC
BYPASS
OUTPUT
CONVERTER
BATTERY
CHARGER
RECTIFIER
OPTIONAL
BATTERY
EXTENSION
MICRO-PROCESSOR CONTROL
BATTERY
SYSTEM
ON/OFF
FRONT
PANEL
OUTPUT
TRANSFORMER
RFI
FILTER
UTILITY
INPUT
MANUAL BYPASS
SWITCH
BACKFEED
PROT.
P.F. = 1
CONVERTER
OPTION
SLOTS for:
RPA CARD
SNMP CARD
RELAY CARD
std. installed:
RS232/
CONTACT
INTERFACE
OUTPUT
BYPASS
FILTER
STATIC
BYPASS
OUTPUT
CONVERTER
BATTERY
CHARGER
RECTIFIER
OPTIONAL
BATTERY
EXTENSION
MICRO-PROCESSOR CONTROL
SYSTEM
ON/OFF
FRONT
PANEL
OUTPUT
TRANSFORMER
RFI
FILTER
UTILITY
INPUT
MANUAL BYPASS
SWITCH
BACKFEED
PROT.
P.F. = 1
CONVERTER
RFI
FILTER
OPTION
SLOTS for:
RPA CARD
SNMP CARD
RELAY CARD
std. installed:
RS232/
CONTACT
INTERFACE