Siemens AG
6
- Vibrations with vibration severity grade SR according to
EN 60034-14.
The bearing replacement intervals t
LW
are reduced by up to 50%
under more severe conditions, e.g. vertical fitting, operating above
75 % of the limit speed n
max
., high vibration and impact loads,
frequent reverse operation etc.
The value t
LW
must be halved for each additional 15°C (59
0
F) by
which the bearing temperature e85°C (185
0
F).
Disassembly
1. Mark the original positions of the parts in relation to one another
(e.g. with a marker pen or a scribing iron) in order to simplify the
re-assembly procedure.
2. Fit the encoder according to 5.2.
3. Unscrew the screws out of the bearing cover and end shield on
the drive end, carefully remove the drive end shield.
4. Pull the rotor out of the motor stator.
5. Pull off the rolling contact bearings using a suitable device (see
Fig. 10.1). Do not re-use the rolling contact bearings after they
have been pulled off.
Assembly
The bearings of the hollow-shaft motors, the standard design is
deep groove ball bearings eep groove ball bearing with plastic
bearing cage(1.60 and 6.10, fig. 2).
Hybrid spindle bearings are used in option L37.
NOTE!
Recommendations for replacing the bearings:
Obtain the bearings from the motor manufacturer (deep
groove ball bearing with special bearing clearance. In the
case of the L37, the hybrid spindle bearings are in a ><
arrangement).
Always replace the full set of sealing elements (radial shaft
seal, GAMMA rings).
L37 without WDR, without Gamma ring.
Ensure absolute cleanliness when changing the bearings.
1. Do not wash out the bearing before greasing.
Half fill the grease compartments (end shield, bearing cover)
with grease (see fig. 10.2).
Grease types: LUBCON THERMOPLEX2TML (from Lubricant
Consult)
Quantity of grease per bearing: see Fig. 9.2, spread the grease
evenly over the raceway.
2. Heat the rolling contact bearings inductively to between 80
0
C to
100
0
C (176
0
F to 212
0
F) and push them on
.
The inner bearing
ring must be flush with the shaft shoulder. Do not hit hard.
3. Position the rotor inside the casing.
4. Check the bearing cover seals, replace if necessary.
5. Insert the drive end shield centrally into the motor casing
without canting it.
6. Tighten the screws in the bearing cover. Screw the drive end
shield up tightly. Tightening torques as shown in fig. 7.
7. Mount the encoder system according to 5.2.
Bearing run-in
Bearings need a running-in time under low load. To do this, run the
motors continuously up from 0 to 75% of the limit speed n
max
over a
period of 20 minutes.
In the case of the L37, repeat several times (3 or 4 times).
ENGLISH
