UPS 120, UPS 150, UPS 250, UPS 300, UPS 301, UPS 500, UPS 600, UPS 750 and UPS 900 Uninterruptible Power Supplies Caterpillar


System Voltage - Calibrate

Usage:

UPS 250 APZ


Calibration of the System Voltage MMS

You must calibrate the system voltages in the MMS system whenever you replace the following:

  • AC Interface PWA (PCC)

  • APS PWA (APC)

  • Parallel Controller Cabinet PWA (PCC)

Note: Calibrating the "system out currents" is required.

  1. Place the UPS into MAINTENANCE BYPASS.

    Refer to Systems Operation, Testing and Adjusting, RENR9988, "SMS Internal and Maintenance Bypass".

    Refer to Systems Operation, Testing and Adjusting, RENR9988, "MMS Internal and Maintenance Bypass".

  2. Turn the "selector switch" for UPSView in the system cabinet to position 1. You will be communicating with MMU 1.


    Illustration 1g01272329
    "Selector Switch" for UPSView

    Note: Refer to the Systems Operation, Testing and Adjusting, RENR9988, "Personal Computer to UPS Connection" in order to connect to the UPS and to login to the UPS.

  3. Click on the "Calibrate" drop-down menu and Select "System Voltages".

    A "Calibration of a Channel" window will open.



    Illustration 2g01272331
    "System Voltages"

  4. Click on the "View Status" button. Another "Calibration Status" window will open. Drag the window aside if the window blocks your view of "Calibration of a Channel" window.

  5. Click on "Use Defaults" on "Calibration of a Channel" window.

    You will be prompted to "Enter Calibration Point for System Input Line Volts AB".



    Illustration 3g01272334
    "System Input Voltage"

  6. Measure the "System input Voltage" from "Phase A" Bus to "Phase B" Bus. Enter this value in "Enter Calibration Point" field. Click "OK".

    The system will process the Calibration. The system will automatically prompt the user to "Enter Calibration Point" for "System Input Line Volts BC".

    The "Calibration Group Status" window will Display "Calibration complete but not saved" for "System Input Line Volts AB".



    Illustration 4g01272387
    "System Input Lines"

  7. Measure the "System input voltage" from "Phase B" Bus to "Phase C" Bus and enter this value in "Enter Calibration Point" field. Click on "OK".

    The System will process the Calibration again. The system will automatically prompt the user to "Enter Calibration Point" for "System Input Phase Volts BN".

    The "Calibration Group Status" window will Display "Calibration complete but not saved" for "System Input Line Volts BC".



    Illustration 5g01272392
    UPSView " System Input Phase Volts"

  8. Measure the "System input voltage" from "Phase B" Bus to the Neutral terminal, if this system is a four wire system. If the system is a three-wire system, measure from the "Phase B" bus to a Ground Terminal. Enter this value in "Enter Calibration Point" field. Click on "OK".

    The System will process the Calibration again. The system will automatically prompt the user to "Enter Calibration Point" for "System Bypass Line Volts AB".

    The "Calibration Group Status" window will Display "Calibration complete but not saved" for "System Input Phase Volts BN".



    Illustration 6g01272568
    "System Bypass Line Volts"

  9. Measure Bypass Voltage from "Phase A" to "Phase B".

  10. Enter this value in "Enter Calibration Point" field. Click on "OK".

    The System will process the Calibration again. The system will automatically prompt the user to "Enter Calibration Point" for "System Bypass Line Volts BC".

    The "Calibration Group Status" window will Display "Calibration complete but not saved" for "System Bypass Line Volts AB" and "System Output Line Volts AB".



    Illustration 7g01272576
    "System Line Volts BC"

  11. Measure "Bypass Voltage" from "Phase B" to "Phase C".

  12. Enter this value in "Enter Calibration Point" field. Click on "OK".

    The System will process the Calibration again. The system will automatically prompt the user to "Enter Calibration Point" for "System Bypass Phase Voltage BN".

    The "Calibration Group Status" window will display "Calibration complete but not saved" for "System Bypass Line Volts BC" and "System Output Line Volts BC".



    Illustration 8g01272606
    UPSView " Bypass Volts BN"

  13. Measure "Bypass Voltage" from "Phase B" to Neutral for 4 wire system and "Phase B" to ground for 3 wire system.

  14. Enter this value in "Enter Calibration Point" field. Click on "OK".

    The System will process the Calibration again. The system will automatically prompt the user to "Enter Calibration Point" for "System Input Line Volts AB" again.

    The "Calibration Group Status" window will Display "Calibration complete but not saved" for "System Bypass Phase Volts BN" and "System Output Phase Volts BN".

  15. Click on "Save"


    Illustration 9g01272619
    "System Input Line Volts AB"

  16. To end the session for calibration in UPSView, click on "Connection" that is located on the menu bar and select "Disconnect". You will stop receiving the telemetry data.

    When the Calibration ends, a message will appear on the text window of UPSView "Flash reprogrammed OK". The message confirms that the Calibration has been completed successfully.

  17. Unplug the RS232cable from the System Input/Output and Isolation Board. Replace the Sheet Metal.

  18. Close the doors for proper air flow into the system.

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