Quality control. SKF Baker AWA-IV 4 kV, Baker AWA-IV 12 kV, Baker AWA-IV 12 HO, Baker AWA-IV Series, Baker AWA-IV 2 kV

Special features of the Baker AWA-IV

Quality control

Quality control testing done in a rewind shop or production facility could use relatively higher voltages compared to maintenance testing of the same motor. In a quality control testing environment, the test results are either pass or fail. Data is not trended and diagnosis is not a goal. Rather, the insulation system of a newly-rewound motor must be able to withstand test levels in accordance with IEEE and NEMA standards.

When conducting quality control tests, failures must be analyzed. For example, some winding configurations will fail a winding resistance test with seemingly reasonable test parameters even when the winding resistance is good. Knowledge of special windings is important and can only be provided by those responsible for the winding.

Motor troubleshooting

In the case of a motor failing during service, the analyzer can help determine the root-cause reasons for failure, and it can provide data to help you make sound decisions about refurbishment vs. replacement. Isolating the site of a phase-to-phase short, for example, can be done by performing a surge test on the windings. The shorted winding will generate a waveform substantially different from the two good windings.

Motor shops can use the Baker AWA-IV to indicate where a problem has occurred, pinpointing what needs to be repaired. Additionally, test results provide a tool for recommendations to the customer.

Field coils

When testing field coils, follow the procedures outlined for testing single-phase motors, twoterminal devices, and synchronous motors/generators. The recommended surge test voltage for DC fields is 600 volts.

If the impedance of the coils is very low (fewer turns, generally form coils with very low resistance), the surge tester standalone might not adequately test the coils. A bar-to-bar, low-impedance test accessory from SKF might be needed.

108 PUB CM/I4 71-015 EN V13.2 Static Motor Analyzer—Baker AWA-IV User Manual