Figure 6 UPS Module Block Diagram
MULTI-MODULE UPS SYSTEM
CONTROL POWER
Controls
Utility |
| Rectifier/ | |
Input |
| ||
| Charger | ||
Power | Input | ||
|
CB
Inverter
MBD
Control
Wiring
To SCC
Output
Power
OutputTo SCC
CB
Battery
CB - Circuit Breaker
MBD - Module Battery Disconnect
SCC - System Control Cabinet
UPS Module
The UPS module consists of module controls, a rectifier/charger, an inverter, protective devices, and other acces- sories.
Module Controls: The module control logic monitors performance of the UPS module. The UPS module status is displayed locally and is also sent to the System Control Cabinet.
Rectifier/Charger: The rectifier/charger converts utility power from AC to DC to charge the battery and pro- vide the DC input to the inverter. Its design limits reflected harmonic current distortion to source power and pro- vides
Inverter: The inverter converts DC power into the precise AC power required to supply a sensitive critical load. The inverter converts DC power into a
Battery Plant
The battery is used as the alternate source of power to supply DC power to the inverter if the AC supply voltage is outside the acceptable range. The battery supplies power to the inverter until the utility power is restored or until an alternate power source is available. If AC source power is not restored or an alternate power source is not available, the battery can be sized to provide power long enough for an orderly shutdown of the load.
14 | Theory of Operation | DISCONTINUED |
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