6.4 Electro-Magnetic Compatibility (EMC)
The EcoDrive is designed for installation/attachment to EMC sewing units and equipment, i.e. it complies
with the relevant EMC regulations (CDV IEC 204-3-1 44 sec 169) for a cable length of 500 mm at each
input or output connector. In accordance with experience, this is adequate for sewing units.
More complicated sewing equipment may require additional action due to longer cables, unfavourable
cable placement, neighbouring strong interference fields etc.
The following action can be appropriate for reducing or eliminating interference:
-
The use of appropriate filters, delay units, line material or line placement.
-
Lines belonging to different circuits (such as mains power, low voltage) being placed at a proper
distance from each other to minimize interference.
-
Reference potential conductors for the circuits, or a common connection point:
star-type wiring with one or more reference points earthed via insulated conductors having a large
cross section.
-
Electrically conductive parts of the sewing unit or equipment should be connected via potential
compensation leads to the protection earth conductor on the EcoDrive control box. (Use leads suited
for high frequencies: fine-gauge stranded leads with a cross section of at least 2.5 mm
2
, or large-
area copper bands.)
When connecting potential compensation leads, make sure to achieve good contact, i.e. use toothed
washers for connections to painted parts.
Include the following parts in potential compensation:
-
sewing machine head
-
sewing machine stand
-
treadle
-
housings of solenoids or solenoid valves
-
holding brackets for push-button switches
-
stands for stackers, band feeders etc.
-
Mass Connections
Lead mass connection lines from each equipment element to a common point.
Use large cross section braided leads between moving parts and casings while keeping mass
connection as short as possible.
-
Signal Transmission
Use electrostatic and magnetic screening, twisted conductors and appropriate line placement to
ensure that transmission of interference voltages from control or mains power lines to signal lines is
prevented.
(Right-angle line crossings are better than any lower angles; by all means avoid parallel
placement.)
-
Separation of Equipment Parts
Equipment parts that are susceptible to interference parts (pulse-processing and/or low-level
subassemblies) should be mounted separately from and/or be screened against switching devices
such as electromagnetic relays, thyristors etc.
-
Although being largely insusceptible to interference, the EcoDrive should not be operated in the
immediate vicinity of HF welding devices or similar equipment to avoid malfunction.
-
The EcoDrive is capable of complying with EMC regulations only when the control box front is
provided with its cover!
-
The covers of the control box must remain closed during operation in order to avoid malfunction due
to EMC causes as well as pollution by dust penetration.
Whenever trouble should occur, please contact the manufacturer.
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6.6
04-03-10
