Siemens SIPART PS2 Operating Instructions Manual page 76

Connection
5.1 Basic safety instructions
Two-wire mode
NOTICE
Connection of voltage source to current input
Device damage if a voltage source is connected to the current input I
● Never connect the current input I
● Always use a voltage source with a maximum output current of I = 20 mA.
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 data
(Page 237).
● HART: Use shielded cables to guarantee the full specification according to HART.
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
76
destroyed.
Shield
Base plate
to a voltage source, otherwise the positioner may be
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Operating Instructions, 05/2017, A5E00074631-AC
(terminals 6 and 7).
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SIPART PS2 with and without HART