TANK GP-FUEL 2456104 - Caterpillar

Illustration 2 g01254252
Diagram of Components (UPS) (1) Input node (2) Input contactor (3) Static switch (4) Bypass contactor (5) Inverter node (6) Output contactor (7) Output node (8) Field coil driver (9) Flywheel inverter (10) DC bus (11) Utility InverterIllustration 2 shows a simplified diagram of the system. The nodes that are shown in Illustration 2 are in the following list: Input Node (1) , Inverter Node (5) and Output Node (7) .The nodes determine the state of the system. The input node (1) and the output node (7) are externally available. These nodes are used in order to attach the system to a power source and to the load. The inverter node (5) is used internally by the system.The DC Bus (10) is also identified in Illustration 2. The DC Bus (10) is used as a power source for the field coil currents. The mode of the system determines one of the following:
If the bus is used as a power source for the flywheel
If the bus is used as a power source for the utility invertersThe main functional blocks are shown in Illustration 2. A description of each function is in the following list:Input Contactor (2) - A mechanical contactor that is used to control the flow of electricity into the systemStatic Switch (3) - The switch is a semiconductor device (thyristor). The Static Switch is used to isolate the system from the utility grid when an outage occurs.Bypass Contactor or Breaker (4) - A device that is used to connect electrically the input source to the load without going through the UPSOutput Contactor (6) - A mechanical contactor that is used to control the flow of electricity to the loadField Coil Driver (8) - The Field Coil Driver is a semiconductor device that is used to drive current through the field coils. The field coils are used to generate magnetic forces that act upon the flywheel. These forces are controlled in order to provide a lifting force on the flywheel. The force prolongs the life of the bearings.Flywheel Inverter (9) - The Flywheel Inverter is a semiconductor device that is used to convert the voltage from the DC Bus into AC signals. When the power from the utility is not available, the flywheel inverter will rectify AC signals from the flywheel to the DC Bus.Utility Inverter (11) - The utility inverter is a semiconductor device that is used to rectify the AC voltage that is on the filter node. The AC voltage is rectified into a DC voltage. When the power from the utility is lost, the utility inverter will convert the voltage from the DC Bus to the operating voltage and frequency of the system.Single Module System (SMS)
Illustration 3 g01254318
SMS One-Line diagram
Illustration 4 g01266334
SMS cabinet layout (12) Bypass cabinet (13) Flywheel cabinetThe UPS 120/150 and 250i/300 SMS systems are distinguished from the MMS systems by a single flywheel multiple module unit (MMU) cabinet. The (MMU) cabinet is bolted to a bypass cabinet.The width of the bypass cabinet