38
Operating Instructions – AC Motors DR / DV / DT / DTE / DVE / Asynchrounos Servo Motors CT / CV
8
Inspection / maintenance on the motor
Inspection / Maintenance
Sequence
1. Remove the forced cooling fan and encoder, if installed (
→
Sec. "Preliminary work
for motor and brake maintenance")
2. Remove flange or fan guard [19], fan [17].
3. Remove the hex head bolt [15] from the drive end bearing end shield [5] and the non-
drive end bearing end shield [14], release the stator [13] from the drive end bearing
end shield.
4. Motors with BM/BMG brake:
– Open the terminal box cover, unfasten the brake cable from the rectifier
– Push the non-drive end bearing end shield and the brake off the stator and
carefully lift them off (if necessary, run the brake cable along with trailing wire)
– Pull the stator back by approx. 3 to 4 cm
5. Motors with BMG02, BR03 brake:
– Remove the complete brake with the releasing lever (on version with manual
brake release)
6. Visual inspection: Are there traces of gear oil or condensation inside the stator?
– If not, continue with 9
– If there is condensation, continue with 7
– If there is gear oil, have the motor repaired by a specialist workshop
7. If there is moisture inside the stator:
– With gearmotors: Remove the motor from the gear unit
– With motors without a gear unit: Remove the drive end flange
– Remove the rotor [9]
8. Clean the winding, dry it and check it electrically (
→
Sec. "Preliminary work")
9. Replace the ball bearings [7], [11] (only use authorized ball bearings
→
Sec.
"Permitted ball bearing types")
10.Reseal the stator seat ("Hylomar L Spezial") and grease the V-ring or labyrinth seal
(DR63)
11.Install the motor, brake and accessories
12.Check the gear unit (
→
gear unit operating instructions)
Lubrication of the
backstop
The backstop is supplied with Mobil LBZ low-viscosity grease as a lubricant and
anticorrosion protection. If you want to use a different grease, make sure it complies with
NLGI class 00/000, with a base oil viscosity of 42 mm
2
/s at 40 °C on a lithium saponified
and mineral oil base. The temperature range extends from –50 °C to +90 °C. See the
following table for the amount of grease required.
Isolate the motor and brake from the supply, safeguarding them against uninten-
tional power-up!
Motor type
71/80
90/100
112/132
132M/160M
160L/225
250/280
Grease [g]
9
15
15
20
45
80