©2019 ALL-TEST Pro, LLC All Rights Reserved 45 Rev 06/20/2019
DC Series Motors
DC series motors have the field and armature
windings connected in series. When testing DC
series motors from the drive both the field and
armature windings are tested at the same time.
The armature leads are normally labeled A1 & A2;
the field leads are normally labeled S1 & S2. For the windings to be in series, A2 & S1, or S2 & A1
are connected. Test the windings by connecting the AT5™ test leads to free- end on the
armature lead and the free end of the field coil.
Since the armature and field windings are connected in series it is enough to only measure the
insulation resistance for one time from the DC motor drive.
INS1 = field windings & armature windings to ground
STATIC readings for DC Series Motors
DC1 = Series & Armature Coil
DC Shunt Motors Single Voltage
DC shunt motors have the field winding 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
field leads are normally labeled F1 & F2. It is
recommended to take the field windings first and the
armature winding second. Note: Always re-measure the armature windings to look for carbon
build up. Test the windings by connecting to F1 & F1, for DC1, then A1 & A2 for DC2.
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 = Field Coils
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