Automatic Bypass Switch; Manual Bypass Switch - GE Digital Energy LP 11 Operating Manual

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 transferred 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.
1-PHASE
MAINS INPUT
If a power failure occurs during bypass operation, load power is 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.
1-PHASE
MAINS INPUT
OPM_LPE_11X_3K0_10K_1GB_V041
BYPASS
FILTER
INPUT
RFI
CONVERTER/
FILTER
BATTERY
CHARGER
OPTIONAL
BATTERY
BATTERY
EXTENSION
MICROPROCESSOR CONTROL
Figure 4. Bypass operation: automatic bypass
BYPASS
FILTER
INPUT
RFI
CONVERTER/
FILTER
BATTERY
CHARGER
OPTIONAL
BATTERY
EXTENSION
MICROPROCESSOR CONTROL
Figure 5. Bypass operation: manual bypass

MANUAL BYPASS SWITCH

OUTPUT
CONVERTER
AUTOMATIC
BYPASS
SWITCH
FRONT
SYSTEM PANEL
ON/OFF
MANUAL BYPASS SWITCH
OUTPUT
CONVERTER
AUTOMATIC
BYPASS
SWITCH
FRONT
PANEL
SYSTEM
ON/OFF
7
RFI
TO LOAD
FILTER
OPTION
SLOTS FOR:
RPA CARD
SNMP CARD
RELAY CARD
STANDARD
INSTALLED:
RS232/
CONTACT
INTERFACE
RFI
TO LOAD
FILTER
OPTION
SLOTS FOR:
RPA CARD
SNMP CARD
RELAY CARD
STANDARD
INSTALLED:
RS232/
CONTACT
INTERFACE
GE DE LP 11 UPS: User manual 4.1 (GB)