Interference Suppression Measures; Grounding Concept - Phoenix Contact Axioline E Series User Manual

UM EN AXL E SYS INST
Axioline E master
Axioline E IO-Link
digital input and output
device
Axioline E
IO-Link/analog converter
28
PHOENIX CONTACT
4.1.2

Interference suppression measures

Phoenix Contact recommends wiring relay coils or motor coils to an RC element in order to
protect the devices against interference. Depending on the application, the delay time of the
relay can be increased by approximately 1 ms.
Figure 4-2 Relay coil with RC element
The following values are recommended for the purpose of dimensioning the RC element:
R = 100  to 200 ; C = 220 nF to 470 nF.
4.1.3

Grounding concept

Axioline E devices operate in the low-level signal voltage range. In the case of low-level sig-
nal devices, interference is discharged via functional earth ground (FE). Functional earth
ground (FE) is only used to discharge interference. It does not provide shock protection for
people. Functional earth grounding is crucial for interference-free operation!
The Axioline E devices are designed to be screwed onto on a flat mounting surface.
Ground the plastic master by means of the mounting screws of the fixing clips,
see page 30.
Ground the metal master by means of the mounting screws of the fixing clips or the mount-
ing plate or the DIN rail, see page 31.
Implement the FE connection via the grounding lug in order to ensure noise immunity.
In environments with high levels of interference, in particular, Phoenix Contact recommends
connecting the converter to an appropriate functional earth ground point using an M4 screw,
see page 50.
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