Setting Up Temperature And Resistance Test - Megger Baker AWA-IV User Manual

Test Procedures

Setting Up Temperature and Resistance Test

1. The temperature and resistance tests share the same setup window. Click on either the Temperature or
Resistance test configuration buttons; by default, they are labeled Manual or 3 Lead/High V. The Temperature/
Resistance Test setup window will appear next.
2. Because the Temperature entry step has been selected, the Temperature Enable radio button is green.
3. Click on the Manual Temperature Entry radio button.
NOTE: The Baker AWA-IV will accept both ° C (Celsius) or ° F (Fahrenheit) temperatures and a temperature range
of -32° C to 250° C. If you choose not to use Temperature entry, click on the radio button and it will be disabled
(grayed out).
4. Because the resistance test was chosen, the Resistance Enable radio button is also green. The motor in this
example is wye-wound, which is indicated on the window and can be changed via the motor's Nameplate tab.
5. The 3 Leads and Automatic radio buttons will be selected by the software for the 3-phase motor by default.
The analyzer will automatically acquire the resistance readings.
6. Depending on the model, some analyzers are equipped with a separate set of resistance test leads to perform a
lead-to-lead low-voltage resistance test. Resistance values must be greater than 0.500 ohms for high-voltage
leads. If the high-voltage leads are used on a motor with resistances less than 0.500 ohms, the analyzer will
prompt the operator to switch to low-voltage leads. For this example, the AWA model being used does not have
the low-voltage leads, so there is no Res Leads box to check.
7. Check the Delta R (%) box and ensure it is set to 10%. If the spread of resistance readings are more than 10%,
the motor will fail.
8. Because temperature is enabled, the Correct to box is checked and defaults to 25° C and the value for copper is
set to the IEEE 118 constant.
9. Target Corrected Resistance is a feature that refines the pass/fail criteria. If checked, the analyzer will fail
a motor if the readings are not within tolerances. For example, the resistance reading for a motor can be
taken using a DVM. Let's say that the reading is 3.1 ohms. In this case, we can check the Target Corrected
Resistance box and enter the value of 3.1 +/- 10%. One issue with using this feature is that enabling target
corrected resistance makes this Test ID specific to a single motor. If resistance data is not available, or you want
to be able to use the Test ID for other motors, do not enable this feature.
10. Click on the Close button.
90 Baker AWA-IV 71-015 EN V16 User Guide
Fig 95: Temperature/Resistance test parameters.
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