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BA 9142 en 02/2015
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.
WARNING
Fire hazard
Fire hazard 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 rods are retrofitted, the maximum heating capacity (see Table 6) on the outer surface of the
heating rods must not be exceeded.
Table 6: 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.
5.6 Indication of oil level
The gear unit is equipped with an oil level indicator (oil-level indicator with MIN and MAX mark) for a visual
check of the oil level at standstill. The oil level is checked when the oil has cooled down (on the oil level
indicator).
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.
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