Additional Safety Notes For Pa And Ff - Siemens SIPART PS2 Operating Instructions Manual

Connecting
4.1 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 high-impedance power source.
• Observe the static destruction limit specified in the "Electrical data (Page 64)".
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 Technical data (Page 57).
• Use shielded cables to guarantee the full specification according to HART/PA/FF/Modbus/
EIA-485/Profibus DP.
4.1.1

Additional safety notes for PA and FF

If the bus shield is fully effective, the interference immunity and the interference emission
conform to the specifications. The following measures ensure that the bus shield is fully effective:
• The shields have been connected to the metallic connections of the positioner.
• The shields have been laid up to the terminal boxes, the distributor and the transceiver.
Note
Dissipation of glitch impulses/equipotential bonding
In order to dissipate glitch impulses, the positioner must be connected to an equipotential
bonding cable (earth potential) using a low resistance. The positioner in the polycarbonate
enclosure is therefore equipped with an additional cable. Connect the this cable to the shield
of the bus cable and the equipotential bonding cable using a cable clamp.
Devices in the stainless steel or aluminum enclosure have a corresponding terminal on the
outer side of the enclosure. This terminal must also be connected to the equipotential
bonding cable.
For applications in hazardous areas, ensure an adequately suitable equipotential bonding
between the hazardous and non-hazardous areas.
The positioner is equipped with an additional input (terminal 81 [+] and terminal 82 [-]) to
approach the safety position. After activating this function, this input must be continuously
supplied with +24 V in order to retain the normal control function.
26
positioner may be destroyed.
to a low-resistance voltage source, otherwise the
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Compact Operating Instructions, 11/2022, A5E03436620-AG
(terminals 6 and 7).
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SIPART PS2 (6DR5...)