Use At Altitudes Over 2,000 M - Siemens SIMATIC RF166C Operating Instructions Manual

Mounting

4.3 Use at altitudes over 2,000 m

Fastener for cable ties
All communication modules have integrated fastening points for cable ties. The fastening
points are located at all four corners of the modules.
The following figure shows the upper left fastening point for 2.5 mm wide cable ties.
Figure 4-2
4.3 Use at altitudes over 2,000 m
The RF166C communication modules can be used at elevations > 2,000 m. See the
following information and restrictions in this regard.
Restrictions of the maximum specified ambient temperature
Table 4- 2
Altitude
-1,000 to 2,000 m
2,000 to 3,000 m
3,000 to 4,000 m
4,000 to 5,000 m
The basic value for application of the derating factor is the maximum permissible ambient
temperature up to +55 °C for altitudes up to 2,000 m. For altitudes > 2,000 m, you must
multiply the derating factor with the maximum permissible ambient temperature. This is
based on the standard IEC 61131-2:2017.
A linear interpolation between altitudes is permissible. The derating factors compensate for
the reduced cooling effect of air at higher altitudes due to the reduced density.
Note
Suitability of the power supply
Make sure that the power supply units you use are also suitable for altitudes > 2,000 m.
24
Securing RF166C communication module with cable ties
Restrictions of the maximum specified ambient temperature with regard to the altitude
Derating factor
1.0
0.9
0.8
0.7
Operating Instructions, 12/2019, C79000-G8976-C578-01
SIMATIC RF166C