turck BL20-GW-CANOPEN, User Manual, Page: 73 / 95

D301087 1211 - BL20 CANopen
7-5
Electromagnetic Compatibility (EMC)
7.3 Electromagnetic Compatibility (EMC)
BL20 products comply in full with the requirements pertaining to EMC regulations.
Nevertheless, an EMC plan should be made before installation. Hereby, all potential electromechanical
sources of interference should be considered such as galvanic, inductive and capacitive couplings as
well as radiation couplings.
7.3.1 Ensuring Electromagnetic Compatibility
The EMC of BL20 modules is guaranteed when the following basic rules are adhered to:
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Correct and large surface grounding of inactive metal components.
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Correct shielding of cables and devices.
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Proper cable routing – correct wiring.
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Creation of a standard reference potential and grounding of all electrically operated devices.
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Special EMC measures for special applications.
7.3.2 Grounding of Inactive Metal Components
All inactive metal components (for example: switchgear cabinets, switchgear cabinet doors, supporting
bars, mounting plates, tophat rails, etc.) must be connected to one another over a large surface area
and with a low impedance (grounding). This guarantees a standardized reference potential area for all
control elements and reduces the influence of coupled disturbances.
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In the areas of screw connections, the painted, anodized or isolated metal components must be
freed of the isolating layer. Protect the points of contact against rust.
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Connect all free moving groundable components (cabinet doors, separate mounting plates, etc.) by
using short bonding straps to large surface areas.
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Avoid the use of aluminum components, as its quick oxidizing properties make it unsuitable for
grounding.
7.3.3 PE Connection
A central connection must be established between ground and PE connection (protective earth).
7.3.4 Earth-Free Operation
Observe all relevant safety regulations when operating an earthfree system.
Danger
The grounding must never – including cases of error – take on a dangerous touch potential.
For this reason, always protect the ground potential with a protective cable.