PS
S1.1
1700
001
OE35
Version no
T-code
F-code
Section
C-code
Drive Motor 24 Volt
74
Service Manual
1997-10-21
grounded condition exists, the test light will light.
Open Circuit
Check between all connecting terminals with test
leads. If the bulb fails to light, an open circuit is
indicated.
Shorted Circuit
Shorted windings in series coils are very difficult to
detect. Generally, if the coil insulation is sound and
these are no signs of overheating, the coil can be
presumed good.
2.6.2. Frame and Field Service Notes
If the inside of the motor is exceptionally dirty and there is
evidence of a grounding condition caused by the dirt, the
inside of the motor can be given an additional coat of
insulating varnish. Red glyptol can be used if a better material
is not available, however, we recommend using a class “H”
Polyurethane air drying insulating varnish. This is readily
available under various brand names from electrical repair or
parts houses in aerosol type dispensers.
Before spraying field coils, make sure they are absolutely
clean and dry. Protect brush rigging, pole shoe faces and end
head seats to keep varnish off.
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