NORD Drivesystems B2050 - Manual (Page 15)

3. Assembly instruction,
storage, transport, preparation, installation
www.nord.com B2050-GB-0613 -15-
3.8 Installing the gear unit
The base and/or flange to which the gear unit is fitted should be vibration-free, torsionally strong
and flat. The smoothness of the mating surface on the base or flange must be according to
tolerance class K of DIN ISO 2768-2. All contamination to the bolting surfaces of gear unit and
base and/or flange must be thoroughly removed.
The base must be designed according to the weight and torque, taking into account the forces
acting on the gear unit. Bases which are insufficiently rigid may lead to radial and axial
displacement during operation, which is not measurable when the unit is stopped.
Tensioning bars must be cast into the concrete base in their aligned state.
The gear unit must be precisely aligned with the drive shaft of the machine in order to prevent
additional forces from being imposed on the gear unit due to distortion.
Note!
The service life of shafts, bearings and couplings depends on the precision of
alignment of the shaft. Therefore, zero deviation should always be aimed for in
alignment. For this, e.g. the requirements for the coupling should be obtained from the
special operating instructions.
The tolerances of the shaft ends and the flange connections should be obtained from the
dimension sheet.
Welding of the gear unit is prohibited. The gear unit must not be used as the earth connection for
welding work, as this may cause damage to the bearings and gear wheels.
The gear housing must always be earthed. With geared motors, earthing via the motor
connection must be ensured.
The gear unit must be installed in the correct orientation (See Section 6.1). All gear unit
feet on each side or all flange screws must be used. Bolts must have a minimum quality of 8.8.
The bolts must be tightened to the correct torques (refer to Section 6.4 for torque values).
Tension-free bolting must be ensured, particularly for gear units with a foot and flange.
Oil checking and drain screws must be accessible.
To ensure that the gearbox does not get too warm and to avoid injury to persons, observe
the following during installation:
Danger!
The surfaces of gear units or geared motors may become hot during or shortly after
operation. Attention: danger of burns! Protection against accidental contact may need to
be installed.
Danger!
No explosive atmosphere must be present when installing the gear unit.