Surge testing notes and recommendations. 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

Test procedures

Surge testing notes and recommendations

The following notes are provided for additional insight into specific Surge testing issues and situations.

Surge testing with rotor removed (typically motor shop testing)

• Enable L-L EAR and set tolerance to 2% (form wound motor).

• Enable LL-EAR and set tolerance to 3% (random wound motor).

• Enable P-P EAR and set tolerance to 10%.

• Disable zero crossing.

Surge testing with rotor installed (typically field testing)

• Enable P-P EAR and set tolerance to 10%.

• Disable L-L EAR when testing in the field.

• Disable zero crossing.

Surge testing DC motors

• Disable P-P EAR.

• Enable L-L EAR when testing in the field.

• Disable zero crossing.

False P-P EAR failures

In some motors, the waveform will slowly migrate to the left as the voltage is increased. If the voltage is increased at too fast a rate, the movement can cause the P-P EAR to generate a value greater than 10%, causing the tester to generate a false failure. To eliminate this nuisance trip, increase the surge test voltage in 25 volt increments.

Surge test underpowered

The Surge test is load dependent. Anything that adds capacitance to the motor under test will increase load on the tester. If the motor draws more energy than the tester can deliver, the test will fall short of the recommended test voltage. The will be realized when the energy bar on the right side of the Surge test window tops out and the surge voltage stop below the expected test voltage. If this occurs, a larger surge tester with more joules of energy should be used.

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