Siemens SIPART PS2 Operating Instructions Manual page 80

Connect
5.1 Basic safety instructions
Maximum AC/DC switching voltage with UL approval E344532
Mechanic Limit Switches (MLS) 6DR4004-6K/-8K are approved for use with positioners with
UL approval. The maximum switching voltage in this case is ≤ 30 V AC/DC.
If switching voltages greater than 30 V are connected, the UL approval for the positioner
becomes invalid.
Note
Improvement of interference immunity
● Lay signal cables separate from cables with voltages > 60 V.
● Use cables with twisted wires.
● Keep device and cables at a distance from strong electromagnetic fields.
● Take account of the conditions for communication specified in the Electrical specifications
(Page 286).
● Use shielded cables to guarantee the full specification according to HART/PA/FF/Modbus/
EIA-485/Profibus DP.
Electromagnetic compatibility
The polycarbonate enclosure is metalized from inside to increase the electromagnetic
compatibility (EMC) with respect to high-frequency radiation. The shield is connected to the
threaded bush shown in the following picture such that it is electrically conductive.
Note that this protection is effective only if you connect at least one of these bushes to the
earthed control valves through electrically conductive (bare) attachments.
Figure 5-1
80
CAUTION
Shield
①
Base plate
SIPART PS2 with PROFIBUS PA
Operating Instructions, 05/2019, A5E00127926-AC