Further information
You can find additional information about the couplings in the coupling operating instructions
provided in the complete gear unit documentation.
3.9 Heating
Introduction
At low ambient temperatures it may be necessary to preheat the gear unit oil before switching
on the drive or while it is in operation.
Heating elements
Heating elements can be used for these applications, for example. Heating elements convert
electricity into heat and transfer this to the oil in which they are immersed. The heating elements
are installed in protective tubes in the housing so that they can be replaced without draining
off the oil first.
Complete immersion of the heating elements in the oil bath must be ensured by adhering to
the installation position in accordance with the dimension drawings in the complete
documentation and the oil level.
WARNING
Explosion and fire hazard
Exposed heating elements pose a fire hazard.
Do not switch on the heating elements unless you have checked that they are completely
immersed in the oil bath.
If heating elements are retrofitted, the heat output at the outer surface of the heating element
must not exceed the maximum values stated in the table below.
The following table contains information about the specific heat output P
HO
as a function of
ambient temperature:
Table 3-2 Information about the specific heat output
P
HO
in W/cm
2
Ambient temperature in °C
0.9 10 to 0
0.8 0 to -25
0.7 -25 to -50
Description
3.9 Heating
Gear unit 5118en
Operating Instructions 10/2017 35
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