Ex p Control Unit
SIEMENS Set
Electrical connections
Rev. 0
01-37A2-7D0004_SIEMENS_Manual_Exp-Control-Unit_20220216_0_en.docx
Page 33 of 80
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6.1.2.2
Earthing cables
The earthing of a system satisfies protective and functional measures.
Please observe the following points:
Earthing cables should be as short as possible.
Avoid ground loops.
Use ground straps with a width of at least 10 mm.
6.1.2.3
Shielding
In order to ensure trouble free operation of a system, cables with the largest
possible surface area (not cross section) are important. High frequency currents
do not flow through the entire cross section of the conductor, but predominantly
on the outer skin of a conductor.
Please observe the following points:
Always connect the shield over a large area using metal cable clips.
Avoid placing the shield on the ground with long wires.
Pre-Fuse
ATTENTION
NOTE THE RATED CURRENT OF THE RELEASE CIRCUIT (K1) AND ADD IT TO
THE FOLLOWING VALUES. THE FOLLOWING VALUES ARE ONLY FOR THE EX P
CONTROL DEVICE.
If the dimensions are too small, the Ex p control unit may be destroyed.
Rated current (controller) + rated current release circuit (K1).
Variant
APEX, AC
Rated current
control unit
>= 2 A
Rated voltage
control unit
>= 277 V AC
Response time
Time lag
Switch-off current
>= 1,5 kA
Melt integral
9,7… 14,7 A²s
