Engineering
26
04/99 AWB 27-1184 GB
Legend for Figure 12:
Main switch
Protective device for power supply units
Capacitive ground
Potential equalization rail
Earth fault monitoring device
Miniature circuit-breaker
Power supply for the digital inputs
Link (no longer required from PS4-200 version 04)
Power supply for the PS4-200
Power supply for the digital outputs
Reference potential for the digital inputs/outputs
Terminal with PE connection
(no longer required from version 04)
Connect top-hat rail to mounting plate (galvanized
sheet steel) with a low impedance connection over a
large surface and with protection against corrosion.
Maintain a clearance of at least 30 cm (12″)
between the analog cable and the power supply
cables.
Do not lay the 0 V of the analog signals together
with the 0 V of the PS4-200 and the 0 V of the
digital inputs/outputs.
Ensure that the analog actuators and
transmitters are galvanically isolated. If potential
isolation is not sufficient, the manufacturers of
the analog transmitters and actuators can
provide suitable filters.
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