Baker D30R, User Manual

Page: 49 / 82

Surge Testing
12/3/2009 | 71-022 V6
D30R 49
21) Repeat step 2 above for the desired lead.
Note : The flicker in wave patterns that is observed when there is arcing between the windings
or phases cannot be stored in the Digital tester. As soon as the TEST button is released, the
wave pattern freezes. This is the only wave pattern that can be stored.
22)
It is desirable to store the wave pattern production by this arcing for reference. The
operator must attempt to release the Test (thus freezing the wave pattern for storage)
at the moment when the wave pattern appears the most affected by the fault (reduced
amplitude and higher frequency).
23)
Change the TLS to position #2 and test again.
Note: It is convenient to store the results of a single motor into a single Record. Store the two
wave patterns for the coil into two Lead locations for the desired Record. The results of up to
ten motors can be stored on the Digital tester.
In summary, for each direction the coil is tested, check the display for the wave pattern
produced in each test. If there are two good stable patterns, the winding is good. If anything
other than good patterns is seen, there is a possible fault. Refer to the chapter on
Determination of a Fault for explanations of wave patterns indicating good or faulty windings.
For determination of wave patterns for a variety of devices refer to Surge Test Applications.
Keep in mind, fault determination is often a result of experience.
Example: Comparison to a master coil
Occasionally, a manufacturer may want to test against a standard. The selected standard coil
is surge tested; results are stored in memory and recalled to the screen. QUICK STORE is
useful for this situation. All unknown coils would be tested and compared to the standard
coil’s wave pattern. Standard testing demonstrates the coils ability to withstand minimum test
voltages and the signature waveform can be compared to the standards single waveform.