AEG 381 D Specifications download pdf (Page 39)

References for the connection of the PCS to a programmable controller:

p Connect the cable screening to the central earthing point of the switching

cabinet!

p 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.

p 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).

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

supply is potential-free.

p Use a separate power supply for the PCS 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.

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

PCS/the communication cable. This especially concerns inductors and

frequency converters.

p 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.

p 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 programmable controller 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 39