DC motor - Siemens, s.r.o.
DC motor - Siemens, s.r.o.
DC motor - Siemens, s.r.o.
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
6.1.6 Checking brushes<br />
Brush movement<br />
Brush height<br />
Maintenance<br />
In normal operation the carbon brushes must rest properly against the commutator<br />
and move easily in the brush boxes. The freedom of movement must be checked<br />
at regular intervals.<br />
Note<br />
The permissible residual brush height is approximately 16 mm. The wear limit for<br />
the carbon brushes is shown by a line mark or by the lower edge of the<br />
manufacturer's name.<br />
On <strong>motor</strong>s with brush-height monitoring, the shortest brush opens a microswitch<br />
when the brush height is still at least 2 mm more than the minimum brush height. In<br />
normal operation the <strong>motor</strong> can then still be used for a further 500-1000 operating<br />
hours.<br />
Caution<br />
Worn carbon brush must be replaced without delay.<br />
[ID 574]<br />
6.1.7 Replacing the carbon brushes<br />
Removing worn carbon brushes<br />
Normally all brush holders are accessible via the open covers or louvered plates of<br />
the bearing end shield at the N-end. In addition, the brush rocker can be rotated to<br />
the most convenient position after the locking screws accessible from the inside<br />
have been loosened. If necessary the cables should be disconnected from the<br />
brush rocker first.<br />
Fitting new carbon brushes<br />
New carbon brushes must be bedded in with emery cloth (not too coarse) as<br />
follows:<br />
•= Use double-sided adhesive tape to attach a strip of emery cloth which is as<br />
wide as the length of the commutator contact surface and as long as the<br />
commutator circumference to the commutator.<br />
•= Insert the new carbon brushes.<br />
•= Slowly turn the commutator by hand according to the correct direction of<br />
rotation (in exceptional cases pull through emery cloth by hand under the<br />
brushes).<br />
SIEMENS AG T61160347010001 (DMHO V9)<br />
Operating instructions 1GG6286-0NA4.-1VV1-Z 6-5