Use At Altitudes Over 2,000 M - Siemens SIMATIC RF186C Operating Instructions Manual

4.3

Use at altitudes over 2,000 m

The RF18xC/RF18xCI communication modules can be used at altitudes > 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.
Effects on the module availability
When the module is operated at altitudes above 2,000 m, the stronger cosmic radiation
starts having an effect on the error rate of electronic components (so-called Soft Error Rate).
In rare cases this may result in the module entering the safe state; this is especially true for
safety modules. However, the functional safety of the module remains completely
unaffected.
Currently valid markings and approvals
Note
Information on the nameplate
You will find the currently valid markings and approvals on the nameplate of the
communication module. All other markings and approvals are currently based on an altitude
up to 2,000 m.
SIMATIC RF185C, RF186C, RF188C, RF186CI, RF188CI
Operating Instructions, 06/2019, C79000-G8976-C512-02
Restrictions of the maximum specified ambient temperature with regard to the altitude
4.3 Use at altitudes over 2,000 m
Derating factor
1.0
0.9
0.8
0.7
Mounting
25