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DC Shunt Motors Single Voltage
DC shunt motors have the field windings and the
armature winding in parallel. For testing DC shunt
motors, the field windings and armature winding are
tested separately.
The armature leads are normally labeled A1 & A2, the
filed leads are normally labeled F1 & F2. It is
recommended to take the field windings first and the
armature winding second.
Note: Always remeasure the armature windings to look for carbon build up.
Test the windings by connecting field windings F1 & F2, for DC1, then armature windings A1 &
A2 for DC2.
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. In the
AT5 IRG1 are the measurements for the field windings and IRG2 are for the armature windings.
INS1 = field windings to ground
INS2 = armature windings to ground
INS3 = field winding to armature winding
STATIC readings for DC Compound Single Voltage Motors
DC1 =Shunt Field Coil
DC2 Armature Coils
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