Technical information

Assembly instructions

5.3 Electromagnetic compatibility (EMC)

The DAC

eco

is prepared for installing in or attaching to sewing units and sewing equipment and meets the

relevant EMC regulations required for this (CDV IEC 204-3-1 44 sec 169) with a cable length of up to 500 mm on

each input or output socket. From experience, this is sufficient for sewing units. With sewing equipment, further

measures may be necessary because of longer cables, bad cabling, strong adjacent interference fields etc. The

effect of interference can be reduced or eliminated by doing the following:

- Via suitable filters, delay units, suitable cables and cable runs.

- Run cables of different electrical circuits (mains voltage, low voltage) physically separate from each other

in order to keep interference low.

- Reference potential wires for the electrical circuits or joint connection point: star-shaped wiring

with one or more reference points that are earthed with large cross-section insulated wires

- Electrically conductive parts of the sewing unit or sewing equipment must be connected to

the protective earth on the DAC

eco

housing via voltage equalising cables. (Cables suitable for high

frequency:

extra-fine stranded wires with a cross section of at least 2.5 mm

or wide copper bands.) When connecting

the potential equaliser, make sure of secure contact, i.e. on painted parts. the

connection must be made using toothed washers.

The following parts must be included in the potential equalisation:

Sewing machine

Sewing machine support frame

Pedal

Magnet or magnetic valve housings

Holder for buttons

Support frames for stackers, tape feed etc.

Earth connections

Earth connections must be run from each part of the equipment to a common point. Braided, large cross-

section wires must be used between moving parts and the housing and the earth connection must be kept as

short as possible.

Signal transfer

Make sure that no interference voltage is transferred from the control and main current cables to signal cables

by using electrostatic and magnetic shielding, twisted wires and the cable run. (A cable crossover at right

angles is better than one with a smaller angle. Parallel runs must definitely be avoided.)

Separating equipment parts

Equipment parts susceptible to interference (components with pulse processing and/or with low levels) should

be separated and/or shielded from switch equipment such as electromagnetic relays, thyristors etc.

In spite of the fact that it is not susceptible to interference, the DAC

eco

must not be operated in the immediate

vicinity of HF welding machines or similar equipment in order to avoid malfunctions. Should problems occur,

please contact the manufacturer.