SHAFT 6I2072 - Caterpillar

The Caterpillar Uninterruptible Power Supply (UPS) is a fully integrated line interactive system that uses a flywheel to store mechanical energy in the form of a rotating mass. When utility power is interrupted, the UPS will convert the mechanical energy that is stored in the flywheel to electrical energy. This energy is supplied to the external load until one of the following conditions occur:
The standby generator assumes the load.
The utility power is available again.
The flywheel runs out of energy.Once utility power returns, the system will transfer the load back to utility power without interruption.The UPS can be used in a wide range of commercial power applications. The systems provide voltage regulation and protection from power outages. This is done in order to provide well regulated power for the following situations: critical loads, sags, surges and outages.The major components that configure a typical 3-wire 1200/1000 Series UPS are shown in Illustration 1.Major Components
3-Wire System
Illustration 1 g01104567
The major 3-Wire UPS system components and the cabinets in which they are located are shown in the following list:
Input circuit breaker (K1) - I/O Cabinet
Bypass static switch - Static Switch Cabinet
Line static switch - Static Switch Cabinet
Line Inductor - Static Switch Cabinet
Inverter 1 contactor (K3) - Controls Cabinet
Inverter 2 contactor (K4) - Controls Cabinet
Filter Inductors - Controls Cabinet
Utility Inverter 1 - Inverter Cabinet
Utility Inverter 2 - Inverter Cabinet
Output (K5) - I/O CabinetNote: "K5" with a maintenance bypass is a motorized output circuit breaker.Note: "K5" without maintenance bypass and with output isolation, "K5" is an output isolation switch.Note: If there is no output isolation, then there is neither a switch nor a breaker.
The CSHV cabinets contain the following components:
DC Disconnect Switch
Flywheel A Inverter
Flywheel B Inverter
Flywheel A
Flywheel BBecome familiar with the