Siemens SIMOTICS DC 1GH5 Operating And Installation Instructions page 86

Maintenance
9.1 Inspection and maintenance
Reworking the commutator after the formation of grooves
Moderate scoring or burn marks do not affect the operational reliability of the machine. The
commutator only needs to be overhauled if it is seriously scorched or grooved and/or is out-of-
round.
● Grind the commutator in the mounted position with a commutator grinder of medium grain
● To do this, lift most of the brushes and operate the motor at a speed of approximately 600
● Place the grinder on the brush holder.
● Remove the grinding dust with dry, oil-free compressed air. Deburr the edges of the
● Where the commutator is severely out-of-round, remove the rotor and skim the commutator
Table 9-3
Shaft height
1G.5 / 1H.5
1G.6 / 1H.6
1G.7 / 1H.7
86
size, grain number 80 (210 - 177 μm).
rpm.
Note
Suck or blow the dust out
Dust inside the motor can cause winding damage. Suck or blow the dust out.
segments if necessary.
on a turning machine. You can skim the commutator down to the smallest permissible
diameter (d ) given in the following table.
min
Commutator overhaul – minimum permissible diameter
500
630
160
180
200
225
250
280
355
400
450
Nominal diameter d (mm)
N
560
720
160
190
210
240
265
300
350
350
400
Minimum diameter d (mm)
min
546
706
154
184
202
232
257
292
340
340
390
SIMOTICS DC 1GH5
Operating Instructions 02/2016