BA 9137 en 12/2015
5.4
Drive coupling
A flexible coupling is to be provided for the gear unit drive. Observe the operating instructions of the
coupling for assembly, operation and maintenance of the coupling.
NOTICE
Property damage
Damage to the gear unit or individual components is possible from inadequate alignment.
When installing the drives, make absolutely certain that the individual components are accurately
aligned to one other. Unacceptable large errors in the alignment of the shaft ends to be connected due
to angular and/or axial misalignments result in premature wear and material damage.
Note
If couplings of other manufacturers are used, the Siemens standard operating instructions for
equivalent couplings provide the minimum requirements for the alignment of the coupling. It cannot be
assured by Siemens whether these minimum requirements are sufficient in any case. If stricter
requirements in the operating instructions of the supplier or similar document are defined, these will
apply.
5.5
Heating
At low temperatures, it may be necessary to heat the gear oil before switching on the drive unit or even
during operation. In such cases, e. g. heating elements can be used. These heating elements convert
electrical energy into heat which is conducted to the surrounding oil. The heating elements are located in
protective tubes inside the housing, thus making it possible to replace them without draining the oil
beforehand.
Heating elements must fully submerge into the oil bath.
The heating elements can be controlled by a resistance thermometer or a temperature monitor, which
emits a signal that is amplified when minimum and maximum temperatures are reached.
A detailed illustration of the gear unit and the position of the add-on parts can found in the drawings of the
gear unit documentation.
DANGER
Explosion and fire hazard
Fire hazard or ignition of an explosive atmosphere by exposed heating rods is possible.
Never switch on the heating elements, unless complete immersion of the heating element in the oil bath
is ensured.
If heating elements are installed afterwards, the maximum heating capacity (see table 7) on the outer
surface of the heating element must not be exceeded.
Table 7:
Specific heating capacity P
Ho
as a function of the ambient temperature
P
Ho
(W/cm²)
Ambient temperature
°C
0.9
0.8
0.7
+ 10
to
0
0
to
- 25
-25
to
- 50
Note
Observe the information contained in the relevant operating instructions for operation and
maintenance.
For technical data and control information, refer to the list of equipment.
