UPS 250, UPS 300, UPS 500, UPS 600, UPS 750 and UPS 900 Uninterruptible Power Supply Caterpillar


Current - Calibrate - Field Coil Current

Usage:

UPS 250 APZ


Note: Perform this procedure whenever the following boards are replaced: Flywheel Interface Board, System Controller Board and Field Coil Driver Board.

  1. Place the key switch in the Bypass position for the MMU that is being calibrated.

    Note: In a Single-Module System, place the key switch in the Bypass position on the System Cabinet.

    Note: Proceed to step 4 for Single-Module Systems.

  1. Connect a PC to the Parallel Cabinet Interface Board that is located in the System Cabinet.



    Illustration 1g01051091

  1. Rotate the switch on the Parallel Cabinet Interface Board to the corresponding Multiple Module Unit.

    Proceed to Step 6.




    Illustration 2g00839256



    Illustration 3g00840027

  1. Remove all sheet metal panels. Remove the sheet metal panel for the System I/O and Isolation Board (2).

  1. Connect a PC to the System RS232/RS485 port that is located on the System I/O and Isolation Board. Make sure that jumper Jmp1 (3) on the System I/O and Isolation Board is in the correct position.

    Note: The lower side is RS232 and the higher side is RS485.

  1. Start your Personal Computer.



    Illustration 4g00840053

    (4) CAT UPS View Icon

  1. Run UPS View by double clicking over the icon (4) on your PC.



    Illustration 5g01003395



    Illustration 6g01003391

  1. Click over the "Settings" (7) in the menu bar.

    The "Connection" window that is shown in illustration 5 will open.

  1. Click on the radio button that has the label "Direct Connect (serial)" (6) .

  1. Select your PC COM Port for this Serial Connection and set the Baud rate.

    The radio button for "Detailed MMU Telemetry" (5) must be checked.

    Note: The default baud rate is 38400.

  1. Click on "OK" Button (10) in order to accept these settings.



    Illustration 7g01003435

  1. Click on "Connection" on the menu bar.

  1. Select "Connect" from the drop-down menu.

    You will be connected to the system and you will receive the system Telemetry.




    Illustration 8g01003470

  1. Once you are Connected, Click over the "Enter Password" (13) in the menu bar.

    The window that is shown in illustration 8 will appear.

  1. Enter "User Name" and enter "Password".

  1. Click on "OK" Button.

    After the Password has been entered, the Menu Option will Change.

    The menu bar will contain a "Calibrate" Option.

  1. Click on "Calibrate".

  1. Select "Field Coil Current".

    You will hear input contactor "K1" close. The Static Switch will turn on. The DC Bus will rise. A "Calibration of a Channel" window will open.

  1. Click on "View Status" button.

    Another "Calibration Status" window will open.

    If the window that opens in Step 19 blocks your view of "Calibration of a Channel" window, drag the window aside.

  1. Click on "Use Defaults" that is located on "Calibration of a Channel" window.

    You will be prompted to "Enter Calibration Point" for "Top Field Coil Current".

  1. The "Minimum" button on "Calibration of a Channel" window is default selection.

  1. Clamp the DC Current probe around the conductor on the positive terminal for the Top Field Coil in order to take a reading. Leave the DC current probe that is hanging on this conductor for the next reading. This reading should be zero.

  1. Enter the value in the "Enter Calibration Point" field.

  1. Click on "OK".

    The System will process the calibration. The system automatically ramps the current to approximately 5 amperes. The system will prompt you to "Enter Calibration Point" for "Top Field Coil Current" again.

    Note: "Maximum" Button on "Calibration of a Channel" window will be automatically selected and the current will ramp to approximately 15 amperes.

  1. Take another reading for the Top Field Coil.

  1. Enter the value in "Enter Calibration Point" field.

  1. Click on "OK". The System will process Calibration.

    The system will prompt "Enter Calibration Point" for "Bottom Field Coil Current" automatically.

  1. Clamp the DC Current probe around the conductor on the positive terminal for the Bottom Field Coil. Take a reading.

    This reading should be zero.

    Note: The "Minimum" Button on "Calibration of a Channel" window is the default selection.

  1. Enter this value in "Enter Calibration Point" field.

  1. Click on "OK". Leave the DC current probe that is hanging on this conductor for the next reading.

    The System will process the calibration. The system automatically ramps the current to approximately 5 amperes. The system will prompt you to "Enter Calibration Point" for "Bottom Field Coil Current" again.

    Note: The "Maximum" Button on "Calibration of a Channel" window will be automatically selected and the current will ramp to approximately 15 amperes.

  1. Take another reading for the Bottom Field Coil.

  1. Enter the value in "Enter Calibration Point" field.

  1. Click on "OK".

  1. Click "Save".

  1. Click on "Save" on "Calibration of a Channel" window.

    You will hear the Input Contactor open. The Calibration ends. You will see the message "Flash reprogrammed OK" on the window (text) of UPS View. This indicates that the Calibration has been successfully completed.

  1. To disable the connection in UPS View, click "Connection" on the menu bar, and select "Disconnect".

    You will stop receiving the system telemetry.

  1. Unplug the RS232 cable. Return the sheet metal to the cabinets on a SMS. Close the doors for proper air flow into the system.

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