Schneider Altivar 71 VW3A7201 handleiding

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Schneider

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Handleiding

32 1757361 06/2012

Electromagnetic compatibility and wiring

Comments

A system is generally divided into one zone for the power electronics and one zone for the control electronics. This is important, whether

the system is installed in one enclosure or spread over several enclosures. It is recommended that a shielding screen is fitted, due to the

high noise emission of the power supply cables. This screen must have a low contact resistance with the frame or the mounting

plate (remove the varnish!).

The installed braking unit and the connected EMC filter must form one unit, that is, they must be connected via a mounting plate with no

insulating varnish.

The connection between the braking unit and the EMC filter must be shielded. The shielding must be connected to ground at each end. The

cable must not exceed 300 mm.

The braking unit mounting plate must be the connection point for the grounding and the shielding of the machine or the equipment. If the

drive or another component of the equipment causes interference, the HF connection of this component will be poor. It can be improved by

an additional grounding network.

The leakage currents increase when EMC filters are used. When the leakage current is greater than 3.5 mA, one of the following conditions

must be met:

- Copper protective cable whose cross-section is greater than 10 mm

- Supervision of the protective cable by a module that trips in the event of a fault.

- Second cable connected in parallel with the protective cable via separate terminals. This cable must be VDE 0100 / part 540 compliant.

Installation of the control cables

The shielding of the digital signal cables, which are connected to the terminals, must be connected to the shielding strips or directly to the

grounded plate, in order to reduce the impedance.

The shielding of the digital signal cables, which are connected to the terminals, must be connected over as large a surface area as possible.

If the screen is grounded via a single wire, there is a 70% increase in the noise.

Commercially available cable clips are suitable for connecting the shielding.

If unshielded signal cables are used, use twisted pairs only.

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