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PMG, DPE Winding, Auxiliary Winding, and
Harmonic/Resonant Winding Use
The XC4-R Automatic Voltage Regulator is compatible with some of these types
of generators but not others. It is necessary to determine which type of generator
you have before proceeding since some styles will connect differently than
others while the XC4-R cannot be used with some of these generators at all.
PMG (Permanent Magnet Generator/Exciter):
This type of generator generally has a permanent magnet generator mounted on the
main shaft along with a brushless exciter and finally the main rotor itself. The XC4-R is
a very fast responding regulator (1/2 cycle response time) and low enough burden on
the main stator that it can be used on these generators without any need for the PMG
input.
To connect the XC4-R to this type of generator, isolate and insulate the PMG leads that
were connected to the original voltage regulator. Measure your field resistance and
proceed with sizing on
Page 4
.
DPE Winding and Auxiliary Winding:
These generators use an extra winding in the main stator as a power supply for the
voltage regulator in an attempt to give the regulator a clean power source that isn’t
affected by load. The XC4-R has proprietary filtering circuitry in its sensing stage that is
largely unaffected by generator load. Because the regulator isn’t affected by loading,
these types of windings are not needed.
To connect the XC4-R to this type of generator identify, isolate, and insulate the
Auxiliary or DPE wiring that were connected to the original voltage regulator. Measure
your field resistance and proceed with sizing on
Page 4
.
Harmonic and Resonant Windings:
This type of generator rarely has a voltage regulator, and instead relies on a phase-
shifted “harmonic” winding and a capacitor to adjust the terminal voltage with load.
They often have a brushless “exciter”, but because they operate on harmonics from the
AC waveform, they do not operate like a typical brushless exciter.
Because these generators rely on AC waveform phasing for
their voltage regulation, the XC4-R cannot be used with this
type of generator.
