Functional Explanation; Principles Of Operation; Normal Conditions; Utility Failure - GE Digital Energy LP 11 Operating Manual

3.1 The Principles of Operation
The UPS stores electric energy in batteries. This allows the UPS to supply output power even when the
incoming utility power is cut off completely.
Energy is stored as Direct Current (DC), while input and output energy must be Alternating Current (AC).
Therefore the UPS contains an input converter (AC to DC) and an output converter (DC to AC). (fig.2)

3.2 Normal Conditions

Under normal conditions, energy from the utility is channelled through the input converter, which supplies the
output converter and the battery charger. The batteries are kept in a fully charged state, and the output
converter synthesizes a completely new AC output sine wave to supply the load (electrical equipment).
INPUT:
MAINS POWER WITH DISTURBANCES
1-PHASE
MAINS INPUT
FILTER

3.3 Utility Failure

In the event of a utility power failure (i.e. absent or outside tolerance) the system uses the energy reserve
stored in the battery to continue to produce AC power, ensuring unbroken output (fig. 3). No interruption or
alteration will ever be noticed in the output power.
In the event of an extended utility failure, the output converter will stop when the battery has been discharged.
At this point, the UPS is no longer able to power the connected equipment.
When the utility is re-established within tolerance, the output converter will restart automatically (if stopped, see
above) and will be supplied again by the input converter. The batteries will be recharged, making them ready to
support future power failures.
NO INPUT:
MAINS FAILURE (BLACK OUT)
FILTER
OPM_LPE_11X_3K0_10K_1GB_V041

3 - Functional Explanation

BYPASS
FILTER
INPUT
RFI
CONVERTER/
BATTERY
CHARGER
OPTIONAL
BATTERY
BATTERY
EXTENSION
MICROPROCESSOR CONTROL
Figure 2. Block diagram of the LP 11 UPS, mains present
BYPASS
FILTER
INPUT
RFI
CONVERTER/
BATTERY
CHARGER
OPTIONAL
BATTERY
BATTERY
EXTENSION
MICROPROCESSOR CONTROL
Figure 3. Block diagram of the LP 11 UPS, utility failure
OUTPUT:
PERFECT UPS POWER
MANUAL BYPASS SWITCH
OUTPUT
CONVERTER
AUTOMATIC
BYPASS
SWITCH
FRONT
PANEL
SYSTEM
ON/OFF
OUTPUT:
PERFECT UPS POWER
MANUAL BYPASS SWITCH
OUTPUT
CONVERTER
AUTOMATIC
BYPASS
SWITCH
FRONT
PANEL
SYSTEM
ON/OFF
6
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)