BEARING-MAIN 4W5492 - Caterpillar

The UPS 1200 automatically supplies AC electrical power to the critical load during certain conditions. There are several operational modes that allow the UPS 1200 to supply power. Most operating modes have several states. The mode and the state are displayed on the Graphical User Interface. The Graphical User Interface is located on the Controls Cabinet.The UPS 1200 continually monitors internal components and incoming utility power. The UPS 1200 changes modes automatically, as required. These changes are made without the intervention of an operator. Detecting and switching the logic inside the UPS 1200 ensures that operating mode changes are automatic and transparent to the critical load.A computer that is connected with an RS-232 cable allows monitoring of the system with the optional UPS View Software. The cable is connected to the RS-232 port that is located in the Customer Interface Tray. The Customer Interface Tray is located on top of the Controls Cabinet.Refer to the following list for the main operating modes of the UPS 1200:
On-line Mode
Bypass Mode (UPS/SMS only)
Off-line Mode (Paralleled MMU only)
Automatic Voltage Regulation Mode
Shutdown ModeThe operator can command the system to enter the On-line Mode or the Bypass Mode via the Graphical User Interface. When an operator presses the "EPO" button that is located on the front of the Controls Cabinet, the system enters the Shutdown Mode. The operator cannot directly place the system into the Automatic Voltage Regulation Mode. Automatic Voltage Regulation Mode is an operating mode that the system enters only under certain conditions. If the system is in the On-line Mode, an automatic transition to the Bypass (UPS/SMS) or Off-line (MMU), Shutdown, or Automatic Voltage Regulation Modes may occur depending on internal and external UPS system conditions.The following paragraphs explain the various operational states of the UPS 1200:On-line (voltage regulating/motoring) - The UPS 1200 is providing a constant voltage to the load. The UPS is drawing power from the input in order to spin the flywheels up to the speed for charging (7700 RPM). The UPS 1200 regulates voltage. When the flywheels reach 4000 RPM, the UPS 1200 can discharge.On-line (standby) - The UPS 1200 is regulating voltage and ready to discharge the flywheels in order to protect the load. Each flywheel draws about 1 kW from the input source in order to maintain standby speed.Bypass (UPS/SMS) - Power is going through the internal bypass circuit of the UPS 1200. The load is not protected.Off-line (MMU) - Power is going through the internal bypass circuit MMU. The load is not protected by this MMU. The load may still be protected by another MMU.Discharge (discharge) - The UPS 1200 has disconnected from the input and is delivering power to the load from the flywheels.Discharge (phase match) - The UPS 1200 is still delivering power to the load but the UPS has qualified the input voltage. The UPS 1200 will match the output (frequency and phase) to the input source.Discharge (walk-in) - Once a phase match is achieved, the UPS 1200 connects to the