MATTHIESEN Magic Finger Bagger, Owner'S Manual

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Maintenance & Troubleshooting 3-5 MN605
Carbon Brushes For Special Operating Conditions
Sometimes, there are problems if motor operation requires a different design or grade of
carbon brush than what was installed when the motor was built. These special operating
conditions include long periods of operation with loads that are significantly greater or
less than rated load capacity. Also, operation in in the presence of certain chemicals, or
extreme temperature and humidity can degrade brush performance.
Generally, poor brush life or commutator wear can occur if one or more of the above
conditions exist. The brush used doesn’t match the operating conditions.
Baldor offers optional brush grades for the above conditions and has replacement
brushes available to retrofit motors. Contact your local Baldor District Office or an
Authorized Baldor Service Center for technical assistance.
Do not change brush grades or the number of brushes per pole. Doing so may void the
warranty and make the motor unsafe. Contact your local Baldor district office or an
authorized Baldor service center for technical assistance.
Authorized Service
Baldor catalog 505 (and the Baldor CD − ROM) lists service shops authorized to service
Baldor DC motors. Contact your local Baldor District Office for more information.
Humidity And Brush Wear
This curve represents 2 grains of water per cubic foot of dry air or 4.6 grams per cubic
meter of dry air.
Zone of Safe Brush Operation
110
100
90
80
70
60
50
40
30
45
40
35
30
25
20
15
10
5
0
10 20 30 40 50 60 70 80 90 100
Percent Relative Humidity
Temperature Degrees F Temperature Degrees C
Danger Zone
Too Low Humidity
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