Siemens Simatic CFU, Commissioning Manual, Page: 161 / 220

The described components meet the conditions of application of the class 4K4H according to
DIN EN 60721‑3‑4.
Use with additional measures
The described components must not be operated without additional measures:
● at locations with a high degree of ionizing radiation
● in aggressive environments caused, for example, by
– the development of dust
– corrosive vapors or gases
– strong electric or magnetic fields
● in installations requiring special monitoring, for example
– elevators
– electrical plants in potentially hazardous areas
An additional measure can be installation in a cabinet or in an housing, for instance.
Mechanical ambient conditions
The mechanical ambient conditions for the described components are specified in the table
below for sinusoidal vibrations.
Table 12-12 Mechanical ambient conditions
Frequency range in
Hz
5 ≤ f ≤ 8.4 Amplitude 3.5 mm
8.4 ≤ f ≤ 150 Constant acceleration 9.8 m/s
2
Reduction of vibrations
If the described components are subject to big shocks or vibrations appropriate measures must
be taken to reduce the acceleration or the amplitude.
We recommend fixing the described components on damping materials (rubber-metal anti-
vibration mountings, for example).
Technical specifications
12.1 General technical specifications
SIMATIC CFU
Commissioning Manual, 08/2019, A5E39252870-AD
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