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DC Shunt Dual Voltage Motors
DC shunt dual voltage motors normally have 2
separate field windings which are in parallel with the
armature windings. For testing DC dual voltage shunt
motors, the 2 field windings and armature winding are
each tested separately.
The armature leads are normally labeled A1 & A2, the
field coil leads for the first field coil are normally
labeled F1 & F2, and the field coil leads for the second field coil are normally labeled F3 & F4. It
is recommended to take the shunt field winding 1 first, the shunt field winding 2 second and the
armature winding third.
Note: Always remeasure the armature windings to look for carbon build up.
Test the windings by connecting to F1 & F2, for DC1, then F3 & F4 for DC2 A1 & A2 for DC3.
Testing the DC motor locally provides the option of performing a DF & Cap to ground test.
Additionally, it is also possible to take IRG measurements on the individual field and armature
windings.
Since the Field leads are parallel to the armature windings, separate IRG to ground are taken
from the field coils to Ground or the frame and the armature coils to ground or frame a third
Insulation resistance measurement is taken from the field coil to the armature coil.
INS1 = field windings to ground
INS2 = armature windings to ground
INS3 = field winding to armature winding
STATIC readings for DC Shunt Dual Voltage Motors
DC1 = Field Coil 1
DC2 = Field Coil 2
DC3 = Armature Coil
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