Testing A Production Motor By Comparing With A Reference Motor - Megger Baker AWA-IV User Manual

NOTE: If the reference waveform is no longer needed or if has been created by accident, uncheck the Test-Ref
EAR(%) and click the Done button, then update the Test ID and it will detach the reference waveform from the
selected Test ID.

Testing a Production Motor by Comparing with a Reference Motor

1. Select the Motor ID for the production motor to be tested. Ensure that it uses the same Test ID as the reference
motor. If the subject motor has not been entered into the database, add it via the Data tab Nameplate view,
ensuring that it is the same type of motor as the reference. Then ensure that the proper Test ID is assigned.
2. You can confirm that the selected Test ID has a waveform attached by viewing the Surge Test setup window. The
Test-Ref EAR (%) box will be checked and a Display Ref button will be visible.
3. Click on the Display Ref button and the reference waveform will be displayed.
4. Click Close to return to the Main window, Tests tab.
5. Click the Run Auto Test button to begin the test.
6. The software will automatically run through the resistance and DC tests, and if the motor passes all other tests, it
will automatically continue with the Surge test.
7. If the software detects a reference test, it will calculate the Error Area Ratio (EAR) at the end of the Surge test.
The EAR is calculated between leads of the motor under test and compared to the reference motor test results.
The software will then compare the EAR values with the tolerances entered in the Test-Ref EAR(%) parameter.
If the EAR values are within tolerance, the motor passes. Conversely, if an EAR value is outside the tolerance, the
motor fails. After the test has been performed and saved, surge waveforms can be examined via the Data tab
Surge view.
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Fig 77: Display reference button.
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