Siemens FLENDER K SH Series - Heating Elements

38 / 109
BA 5846 en 05/2015
5.10 Heating
At low temperatures it may be necessary to preheat the gearunit oil before switching on the drive unit or
even during operation. In such cases the use of heating elements is possible. The heating elements
convert electrical energy into heat which is transferred to the surrounding oil. The heating elements are
located in protective tubes inside the housing, thus making it possible to replace the heating elements
without draining off the oil.
Ensure that the heating rods are completely immersed in the oil bath.
The heating rods can be controlled by a temperature monitor which emits a signal when minimum and
maximum temperatures are reached; the signal requires amplification.
1)
2 1 2 1 2 1 21
2)
Fig. 17: Heating on gear units of types K..H, K..M
1 Heating element 2 Temperature monitor
1) K..H / K..M Sizes 15 to 24
2) K..H / K..M Sizes 115 to 124
For a detailed illustration of the gear unit and the position of the addon parts, refer to the drawings in the
gearunit documentation.
DANGER
Risk of explosion or fire
Fire hazard or risk of ignition of an explosible atmosphere through exposed heating elements.
Never switch on the heating elements, unless complete immersion of the heating elements in the oil bath
is ensured.
If heating elements are fitted afterwards, the maximum heating capacity (see table 7) on the outer surface
of the heating elements 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 up to 0
0 up to - 25
- 25 up to - 50
Note
For operation and maintenance the instructions in the corresponding operating instructions must be
observed.
For technical data and control information, refer to the list of equipment.