Functional Explanation; Principles Of Operation; Normal Conditions; Utility Failure - GE LanPro 11 U User Manual

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3.1 The Principles of Operation
®
The LanPro -U 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:
UTILITY POWER WITH DISTURBANCES
UTILITY
INPUT
RFI
FILTER
Figure 2. Block diagram of the LanPro
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 be supplied again by the input converter
and the batteries will be recharged, making them ready to support future power failures.
NO INPUT:
UTILITY FAILURE
RFI
FILTER
Figure 3. Block diagram of the LanPro
LX: OPM_LPA_11U_5K0_10K_1US_V021

3 - Functional Explanation

BYPASS
FILTER
P.F. = 1
BACKFEED
CONVERTER
PROT.
RECTIFIER
OPTIONAL
BATTERY
BATTERY
EXTENSION
MICRO-PROCESSOR CONTROL
BYPASS
FILTER
P.F. = 1
BACKFEED
CONVERTER
PROT.
RECTIFIER
OPTIONAL
BATTERY
BATTERY
EXTENSION
MICRO-PROCESSOR CONTROL
6
OUTPUT:
PERFECT UPS POWER
MANUAL BYPASS
SWITCH
STATIC
BYPASS
OUTPUT
CONVERTER
OUTPUT
TRANSFORMER
BATTERY
CHARGER
FRONT
SYSTEM
PANEL
ON/OFF
®
-11U UPS, utility present
OUTPUT:
PERFECT UPS POWER
MANUAL BYPASS
SWITCH
STATIC
BYPASS
OUTPUT
CONVERTER
OUTPUT
TRANSFORMER
BATTERY
CHARGER
FRONT
SYSTEM
PANEL
ON/OFF
®
-11U UPS, utility failure
GE DE LanPro-11U UPS: Installation / User Manual 2.1 (US)
GE Digital Energy
OUTPUT
RFI
FILTER
OPTION
SLOTS for:
RPA CARD
SNMP CARD
RELAY CARD
std. installed:
RS232/
CONTACT
INTERFACE
OUTPUT
RFI
FILTER
OPTION
SLOTS for:
RPA CARD
SNMP CARD
RELAY CARD
std. installed:
RS232/
CONTACT
INTERFACE