MTS Systems Series TBF-R User Manual download pdf (Page 29)

3.5 Measures for an Installation in Compliance with the EMC

Directives

Because of the compact design of servo amplifiers, no complete noise suppression

measures are possible without modifying the design. Therefore the proposed measures

shall help to keep the EMC directive for the total system. These measures are necessary

only for the used inputs and outputs. In addition to that a single total interference

suppression of the mains lead of all electronic subassemblies, installed in the system, is

possible. This would lead to a cost reduction compared to single interference suppression.

In order to simplify the installation work, we offer a number of backplanes with integrated

interference suppression elements and connection boards for ring toridal-core

transformers with interference suppression elements too.

• Motor lines and control lines have to be wired as shielded lines in principle. Avoid

interferences and loops.

• All lines shall run in one direction only that means no wye connection, from the servo

amplifier via the mounting plate of the switch cabinet.

• The clearance between motor line, mains lead and control lines should be at least

20mm. Otherwise there is the risk of interference coupling.

• The shield of each cable has to be connected close by the servo amplifier with a

fastening clamp to the mounting plate of the switch cabinet. Please ensure a large

blank metallic contact surface. The shield of the motor line has to be connected on both

sides (the resolver line or the tachometer line only at one side) to the servo amplifier.

• The mains transformer has to be installed close by the servo amplifier. The secondary

line length of the transformer has to be as short as possible. Run the primary line of the

transformer twisted with a clearance of at least 50mm to all other lines.

• The slide-in rack of the servo amplifier has to show a good HF contact to the mounting

plate of the switch cabinet, provide for sufficient earthing of the switch cabinet.

• To earth the shieldings, the metallic armored screw joints have to be used. Run them

through the switch cabinet wall, with a good metallic contact to the wall.

• For EMC reasons. the shields of one connection line must always have contact on both

sides. Low-frequency circulating currents, however, may occur. These so-called hum

pick-ups are, for example, created by earthing on both sides and can be eliminated by

a capacitiv coupling of the shield, which consequently allows high frequency efficiency.

It is useful to carry out an EMC examination for the complete system, consisting of many

single components such as motor, servo amplifier, set value resolver, EMC filter, to

guarantee a troublefree operation in compliance with the CE directive.

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MTS Systems Series TBF-R User Manual Page 29