SOLA 4000 - General System Description
1 UPS Assembly
1.2 UPS System Structure
The basic SOLA 4000 power supply unit is an ac/dc/ac converter; the block diagram: Figure 1.1 illustrates six essential functional components:
•Rectifier/battery charger (6 pulse) (RECT.)
•Battery (BATT.)
•Inverter (INV.)
•Static inverter switch (SSI)
•Static bypass (SSB)
•Maintenance bypass (IBY)
All components are located in a single housing. They are explained in detail on the following pages.The control electronics of the rectifier, inverter and static bypass sections are completely inde- pendent of each other. i.e. a failure in any one section will not cause a failure in another section.
1.3 Rectifier/Battery Charger
In the standard configuration the charger is a three phase/6 pulse rectifier that converts ac voltage to dc voltage. No isolation trans- former is used and the rectifier is connected to the mains via the commutation chokes which reduce the mains distortion created by the rectifier. The dc output of the rectifier feeds the inverter and the battery. The battery is connected to the rectifier through a satura- tion choke which reduces ac ripple current to the battery, thus ensuring the maximum battery
The rectifier is designed to feed both the inverter at maximum load conditions and simultaneously the battery with maximum charging current. Normally, the battery voltage is constantly regulated at 432 V dc (floating charge,
A
FIG. 1.3 - 12-pulse Rectifier Block-Diagram
JUE 401264 | 7 |
