g
Digital Energy™ LP Series
3 - Functional Explanation
3.1The 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)
3.2Normal Conditions
Under normal conditions, energy from the utility is channeled 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).
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MAINS POWER WITH DISTURBANCES |
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| PERFECT UPS POWER |
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| MANUAL BYPASS |
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| SWITCH |
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| BYPASS | STATIC |
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| FILTER | BYPASS |
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UTILITY INPUT |
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| RFI | TO LOAD |
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| FILTER | |
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| P.F. = 1 |
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| OPTION |
RFI | BACKFEED | CONVERTER/ | OUTPUT |
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| SLOTS FOR: |
FILTER | PROT. | RECTIFIER/ | CONVERTER |
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| RPA CARD |
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| BATTERY |
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| CHARGER |
| OUTPUT |
| SNMP CARD |
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| TRANSFORMER |
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| OPTIONAL |
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| RELAY CARD |
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| SYSTEM | FRONT |
| STANDARD |
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| BATTERY | PANEL |
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| ON/OFF |
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| BATTERY |
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| RS232/ |
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| CONTACT | |
| EXTENSION |
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| INTERFACE |
MICROPROCESSOR CONTROL
Figure 2. Block diagram of the LP 11U UPS, utility present
3.3Utility 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
NO INPUT: |
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| OUTPUT: |
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UTILITY FAILURE |
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| PERFECT UPS POWER |
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| MANUAL BYPASS |
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| SWITCH |
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| BYPASS | STATIC |
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| FILTER | BYPASS |
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| RFI | TO LOAD |
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| FILTER | |
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| P.F. = 1 |
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| OPTION |
RFI | BACKFEED | CONVERTER/ | OUTPUT |
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| SLOTS FOR: |
FILTER | PROT. | RECTIFIER/ | CONVERTER |
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| RPA CARD |
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| BATTERY |
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| CHARGER |
| OUTPUT |
| SNMP CARD |
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| TRANSFORMER |
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| OPTIONAL |
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| RELAY CARD |
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| SYSTEM | FRONT |
| STANDARD |
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| BATTERY | PANEL |
| INSTALLED: | |
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| ON/OFF |
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| BATTERY |
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| RS232/ |
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| CONTACT | |
| EXTENSION |
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| INTERFACE |
MICROPROCESSOR CONTROL
Figure 3. Block diagram of the LP 11U UPS, utility failure
LX: OPM_LPU_11U_5K0_10K_1US_V030 | 7 | GE DE LP 11U UPS: Installation / User Manual 3.0 (US) |