SKF Baker AWA-IV 12 HO, User Manual

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The lower portion of the Temperature/ Resistance Test window contains buttons used in
manual and semi-automatic testing. It also include three columns that display test results
for all testing options. The Delta R average result is also displayed here.
Three columns report measured line-to-line resistance, temperature corrected resistance,
and calculated coil resistance values.
As mentioned previously, there are two ways to obtain resistance data. In automatic mode,
the analyzer will measure the resistance when you click on the Automatic radio button. The
second way is to manually measure the leads using a precision resistance bridge then directly
entering the values into the corresponding Measured L-L fields.
NOTE
A precision resistance bridge is a typical example of a device that is sensitive
enough to collect accurate data to use in resistance imbalance calculation. It is
most important to ensure that the instrument used can give you accuracy that is
consistent with the measurement being made and the device being measured.
Figure 59. Test Results section of the Temperature/Resistance Test setup window.
Another key difference between the automatic and manual modes is that the automatic
mode will make a resistance measurement per your specifications between a lead with the
other two leads held at ground. A balance test can be done, or the low-voltage leads can be
used for a more precise test.
A resistance value that is manually entered will be different: a measurement made with a
bridge will be between two leads with a third lead allowed to float. Due to this difference, the
winding configuration becomes even more important. The Baker AWA-IV software assumes
that manually entered data will be made with a two-lead precision bridge and that the third
lead is allowed to float. Clearly, a wye motor’s lead-to-lead measurement will be different
from a delta lead-to-lead measurement.
Regardless of how the resistance measurements are acquired, after they are obtained the
software will calculate the temperature corrected resistances and display them. Additionally,
if possible, the analyzer will calculate the individual coil resistances. If not, the software will
display a message indicating that a solution to the coil resistance could not be found.
While the
Temperature / Resistance window is open, there are several ways to start a
resistance test measurement:
1) Click the
Test All Leads button. The analyzer then measures each lead’s resistance
sequentially (semi-automatic testing).
2) Click one of the lead buttons on the Baker AWA-IV front panel. The analyzer then
measures the resistance of the clicked lead only and displays the results (manual
testing).
58 PUB CM/I4 71-015 EN V13.2 Static Motor Analyzer—Baker AWA-IV User Manual
Baker AWA-IV software overview