Low-impedance Armature or Coil Testing Using the Baker PPX30A
Some coils or armature windings have very low impedance and cannot be tested with just the AWA host. Baker ZTX
functionality is required to test these coils. DC series fields, pole face windings, and interpoles are common examples
of low-impedance circuits that require the ZTX functionality for proper evaluation. When combined with a PPX30A
power pack (built-in ZTX functionality), the Baker AWA accommodates testing of low-impedance coils and armatures.
PPX30A Configuration for Armature (Low-impedance Device) Tests
The low-impedance device test feature (commonly called armature testing) is built into the Baker PPX30A power pack
and can be selected by placing the
Function
Selector
switch on the front panel into the Armature (
armature icon
)
position.
Fig 39:
Baker PPX30A armature test settings.
Item
Description
1
Function Selector switch
2
Armature test mode (Low-impedance device testing such as armatures, DC field coils, and
interpoles). Employs the Baker ZTX impedance matching transformer circuitry built into the
PPX30A.
3
Test Select switch.
4
Set to LEADS GROUND (ground icon) for Armature (low-impedance device) testing.
CAUTION: Do not switch the Test Select switch or the Function Selector switch while a test is in progress. You may
substantially reduce the switching element’s useful life if you perform such switches in the middle of a test.
1. Ensure that the power pack setup procedure has been followed as described earlier.
2. Set the
Function
Selector
switch to Armature (
armature icon
).
3. Ensure that the
Test Select
switch is set to LEADS GROUND (
ground icon
).
4. The power pack’s high-voltage test leads are not used for this procedure. Ensure that they are not connected to
anything and lay them safely aside.
The black braided leads with circular surge and sense connectors are used
instead.
Using Power Packs with Baker AWA Testers
42
Baker Power Packs User Guide 71-061RC EN V2
www.megger.com
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