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9.1.6
Clean the machine
Cleaning the cooling air passages
● Regularly clean the cooling air ducts through which the ambient air flows. The frequency
● In addition, every time a worn brush set is replaced, clean the internal cooling air ducts
Removing brush dust
● Remove all deposits of brush dust on insulating components, e.g. using a brush and suitable
● Disassemble motors with enclosed internal looped circulation and no fine dust filter, once
● When brush rockers are cleaned, care must be taken not to damage the trip mechanism
● Replace dirty cassette filters with new ones.
● After cleaning, check the insulation resistance (Page 34).
9.1.7
Checking the carbon brushes
In normal operation, check regularly to ensure the carbon brushes are in good contact with
the commutator and are moving freely in the brush guides.
Brush height
The wear limit of carbon brushes is indicated by a line or by the lower edge of the
manufacturer's name stamp.
SIMOTICS DC 1GH7
Operating Instructions 02/2016
of the cleaning intervals depends on the degree of pollution.
(where accessible) and the insulating components of the commutator and the brush gear.
extraction equipment.
around three brush sets have been eroded. Thoroughly remove all brush dust from the
motor.
on motors with brush-height monitoring.
Note
Damage on the surface of the sound absorber elements
On external fans with sound absorbers, the surface of the absorber elements is pressure-
sensitive. Air-pressure cleaning can damage this surface.
● Air-pressure cleaning equipment should not be used directly on the sound absorber
elements.
● Carefully brush away any large deposits of dust which could be drawn in whole by the
air flow.
Maintenance
9.1 Inspection and maintenance
83
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