AEG 381 D Specifications download pdf (Page 58)

D1.7 References for the connection of the PCS to a PLC

Warning!

Check the PCS function after parameterization and/or driver installation.

All parameterized functions must be examined. Otherwise malfunctioning

of the PCS and/or programmable controller are possible.

Connect the cable screening to the central earthing point of the switching cabinet!

Ensure appropriate chassis groundings with regard to the PCS housing on the

one hand and the programmable controller bus board on the other! Remember,

that a copper grounding strip due to its large surface ensures a considerably higher

RF conductivity than normal stranded interconnecting wire.

Avoid, as far as possible, high frequency interference because damping is very

difficult in this case. The progr. contr. and the PCS are electrically isolated by

optocouplers, but this isolation is not effective in case of high-speed transients

because optocouplers feature a coupling capacitance (although it is very low).

Ensure clear supply voltage reference points. To facilitate this, the power supply is

potential-free.

Use a separate power supply for the PCS (24 V, 10 VA if the supply voltage is

influenced by high interference. It should be equipped with appropriate noise filters.

In this case, 0 Volt can directly be connected to protective earth at the PCS.

Ensure a minimum distance of 200 mm between noise sources and the PCS/the

communication cable. This especially concerns inductors and frequency converters.

Please take care that the serial data lines are covered completely (if possible) by

the shield. Use a metallized connector hood at PCS as well as at the progr. contr.

side and ensure a highly conductive connection between the connector hood and

the shield.

Please notice that grounding on both sides may require an equi-potential bonding

conductor with a cross section of 10 times that of the shield. This is especially

important, if the PCS and the PLC are not connected to the same common point (if

they are for example installed in different control cabinets)! This is necessary to

prevent equalizing currents on the cable shield!

First commissioning

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AEG 381 D Specifications Page 58