Sterling 238 User Manual
Powder Hopper Loaders
Page 35
Following steps 5 and 6 above, perform the same procedure
for the opposite side.
for the opposite side.
2. Remove the armature assembly at the top portion of the
hopper loader to properly seat the replacement brushes.
hopper loader to properly seat the replacement brushes.
3. Insert a strip of 600-grit sandpaper with the rough side
facing the brush.
facing the brush.
4. Release the brush and rotate the commutator back and forth
by hand (See the alternative seating procedure on the facing
page) so that the brush is sanded to match the arc of the
commutator.
by hand (See the alternative seating procedure on the facing
page) so that the brush is sanded to match the arc of the
commutator.
5. In older motors, the wear of the brushes creates a shallow
trough in the commutator. Sand the brush to conform to the
contour.
trough in the commutator. Sand the brush to conform to the
contour.
6. Remove the sandpaper, and repeat steps 5 and 6, as needed
until all brushes are replaced.
until all brushes are replaced.
7. Reinstall the armature assembly.
Seating Motor Brushes
You have two (2) options for seating motor brushes (Steps 5
to 11):
to 11):
Option 1
Run the powder hopper loader at 50% to 75% voltage for about
30 minutes.
Apply power from a variable transformer at the motor
disconnect, not at the control box.
Option 2
Connect two (2) hopper loader motors in series and run them
for about 30 minutes.
WARNING!
On motors using white AMP disconnects,
make sure power is not applied to the green
ground wire; otherwise, the motor housing
becomes electrically “hot.”
Reducing line voltage may be accomplished
by using a variable transformer or by
connecting two identical motors in series.
ground wire; otherwise, the motor housing
becomes electrically “hot.”
Reducing line voltage may be accomplished
by using a variable transformer or by
connecting two identical motors in series.