9.2.6 Replacing the speed encoder
9.2.6.1 Speed sensor with conical hub
Disassembly
The speed-sensor rotor with its conical hub either rests on, or is bolted to, the machine shaft
journal.
Note
Damage to the speed sensor
The speed sensor can be damaged during motor disassembly. Remove the speed sensor
before disassembling the motor.
1. Remove the cover of the speed sensor.
2. Unscrew the speed-sensor stator and move it away, axially. Take care with the brushes
when doing this.
3. Unscrew the central M6 fixing screw from the speed-sensor rotor.
4. Insert a steel pin (4.8 x 24) into the threaded hole to support the forcing-off bolt.
5. Screw the M8 forcing-off bolt (minimum thread length 30 mm) into the threaded hole of the
hub of the speed-sensor rotor, thus forcing the rotor off the conical base of the shaft journal.
6. The shaft journals or half-couplings mounted on or in the machine shaft extension must be
dismantled and replaced if they are damaged.
– When replacing damaged parts, such as the tolerance ring, please ensure they are
correctly arranged.
– Use removable LOCTITE and suitable tools to assemble parts.
7. Use a socket screw wrench to DIN 3113 (width between pivots 35 mm) to screw or unscrew
the bolt-mounted shaft journal.
Table 9-4 Recommended torques for tightening the shaft journal
Thread size Torque [Nm]
M16 20
M20 30
M24 40
Assembly
Reinstall the disassembled speed sensor and secure it in position.
The legend numbers in the following illustration are explained in chapter Spare parts / Speed
sensor (Page 129).
Maintenance
9.2 Repair
SIMOTICS DC 1GG6
Operating Instructions 02/2016 99
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