Electromagnetic Compatibility (Emc) - DURKOPP ADLER DAC BASIC - V 12-2010 Manual

7.3

Electromagnetic compatibility (EMC)

The DAC or DAC
basic classic
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:
- by 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
frequency:
extra fine stranded wires with a cross section of at least 2.5 mm
the potential equaliser you must ensure secure contact i.e. on painted parts the
connection must be made using toothed washers.
- by 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
suitable for high frequency:
extra fine stranded wires with a cross section of at least 2.5 mm
connecting
the potential equaliser you must ensure 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 push 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
By using electrostatic and magnetic shielding, twisted wires and the cable run you must ensure that no
interference voltage is transferred from the control and main current cables to signal cables. (A right angle cable
crossover 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
the immediate vicinity of HF welding machines or similar equipment in order to avoid any malfunctions. Should
problems occur, please contact the manufacturer.
© 2010 Dürkopp Adler AG
is prepared for installing in or attaching to the sewing units and sewing equipment and
housing by potential equalising cables. (Cables suitable for high
basic
or DAC
basic
2
or wide copper bands.) When connecting
housing by potential equalising cables. (Cables
classic
2
or wide copper bands.) When
or DAC
basic
29
Assembly instructions
must not be operated in
classic