AEG SB4 series User Manual download pdf (Page 141)

100

101

Earthing and EMC-Measures

K1 Contact, e.g., for protective

logic and safety interlocks

V1 Safety diode in the

output module

V2 Clamping diode on site

Figure 62 Wiring Inductive Contact Elements

Inductive AC actuators are to be wired directly at the inductivity, e.g., with interference

suppression capacitors (RC elements) for the same reasons (see also Fig. Figure 36).

5.4.2 Wiring the Reference Conductor in an I solated Structure

If the reference conductors of the process periphery are not earthed against the recom-

mendation, e.g., as a safety measure, the corresponding reference conductors should

be wired as follows to improve the noise immunity:

Reference conductor

Functional earth

0.1

μF

Ω

400 V-

Figure 63 Wiring the Reference Conductor in an Isolated Structure

The1MΩ resistor discharges the static charges

The membrane capacitor (note the radio frequency input) short-circuits radio fre-

quency interference

A piece of earth fault monitoring equipment can be used to monitor the earth fault of

the U

working voltage:

Reference conductor (M)

Functional earth (PE)

0.1

μF

Ω

400 VDC

Supply voltage to be monitored (Us 24)

220 VAC

H1 Isolation monitoring equipment, e.g., RELNG1

Figure 64 Monitoring the Us Working Voltage for an Earth Fault

If the configuration covers several cabinets, the wiring is to be repeated for each cabi-

net.

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AEG SB4 series User Manual Page 141

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