Lenze MGXQK DC motors - Manual (Page 15)

15
7. Maintenance / Repair
n Maintain and repair the drive only when no
voltage is applied !
Disconnect drive from the power supply!
n High temperatures of the motor surfaces.
Keep cooling times!
n
Remove loads from the motor or secure
loads acting on the drive!
n
Make sure that no foreign matter
penetrates inside the motor during
maintenance and repair!
7.1 Maintenance periods
Carbon brushes and in some cases also
collectors are wear parts in commutator
machines.
¯ Service intervals:
Since the abrasion of the carbon brushes
strongly depends on the operating
conditions, we recommend the following
intervals for checking:
-- 1st check after approx. 100 operating
hours
-- 2nd check after 300 more operating
hours
-- further tests depending on the wear
which has been found. For safety
reasons, the service intervals should not
exceed 1000 operating hours.
7.2 Wear check of carbon brushes
¯
To remove the brushes the brush yoke of
some motors must be disconnected and
rotated. The correct position of the brush
yoke (neutral zone!) is marked by a colour
mark at the brush yoke and the endshield.
This mark must exactly coincide after
inspection or replacement of the brushes.
¯
We recommend to write down the
measured brush length.
¯ Check the quality and the appearance of
the running surface of collector and carbon
brush, especially during the first check:
-- A homogenous film (patina) must have
deposited on the collector running
surface.
-- The running surface of the carbon
brushes must be even and must not
show any ”blushings”, burnings or
broken edges.
-- If the result of the inspection is not
satisfactory, you can refer to chapter 7.4,
find possible causes and eliminate them.
In case of doubt, please contact the
Lenze Service.
Show/Hide Bookmarks