BOLT 4B7220 - Caterpillar

MMS Output Current Calibration
The MMS current must be calibrated whenever the following are replaced:
AC interface PWA (ACI)
APS PWA (APC)
Parallel controller cabinet PWA (PCC)Note: Calibration of the system voltages is also required.
Only perform the calibration if there is at least a constant 50 percent load on the system, otherwise, do not perform the calibration. Click the "Use Defaults" button and "Save".
Read the notice above.
Refer to the Systems Operation, Testing and Adjusting, UENR3954, "Personal Computer to UPS Connection" in order to connect to the UPS and to log in to the UPS.
Place the UPS into Internal Bypass. Refer to Systems Operation, Testing and Adjusting, UENR3954, "Transfer to Bypass Mode (MMS)".
In UPSView, click the "Calibrate" in the tool bar.
From the drop-down menu, select "System Out Current".
Illustration 1 g01272735
System out current
A "Calibration of a Channel" dialog will open. Click the "View Status" button. Another "Calibration Status" dialog will open. Drag the dialog aside if the dialog blocks the view of the "Calibration of a Channel" dialog. Click on "Use Defaults" located in the "Calibration of a Channel" dialog. The system will prompt to "Enter Calibration Point" for the "System Output Current Phase A".
Apply a load to the system.
Measure the system out current at "Phase A".
Enter the measured value in "Enter Calibration Point" field.
Illustration 2 g01272792
System output current phase A
Click "OK". The system will process the calibration and automatically prompt the user to "Enter Calibration Point" for the "System Output Current Phase B".The "Calibration Group Status" dialog will display "Calibration complete but not saved" for "System Output Current Phase A".
Illustration 3 g01272827
System output current phase B
Measure the system out current from "Phase B" bus.
Enter the measured value in the "Enter Calibration Point" field.
Click "OK". The system will process the calibration and automatically prompt the user to "Enter Calibration Point" for the "System Output Current Phase C".The "Calibration Group Status" dialog will display "Calibration complete but not saved" for the "System Output Current Phase B".
Illustration 4 g01272835
System output current phase C
Measure the system out current from "Phase C" Bus, and enter this value in "Enter Calibration Point" field. Click on "OK". The system will process the calibration and automatically prompt the user to "Enter Calibration Point" for the "System Output Current Phase A" again.The "Calibration Group Status" dialog will Display "Calibration complete but not saved" for the "System Output Current Phase C".
Illustration 5 g01272839
"System Current - Calibration complete but not saved"
Click "Save".
To end the calibration session in UPSView, click "Connection" that is located on the menu bar. Select "Disconnect". The PC will stop receiving the telemetry data.
Unplug the "RS232" cable from the system I/O and isolation board. Install the access panels that were removed.
Close the doors for proper air flow into the system.