Electrical installation
Important notes
6
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LDCDS−EL100 EN 8.0
6
Electrical installation
6.1
Important notes
Stop!
No device protection against excessive input voltage
The voltage input is not fused internally.
Possible consequences:
ƒ
The device can be destroyed when the input voltage is too high.
Protective measures:
ƒ
Observe the max. permissible input voltage.
ƒ
Professionally fuse the device on the input side against voltage fluctuations
and voltage peaks.
6.2
Wiring according to EMC
General notes
l
The electromagnetic compatibility of the system depends on the type and accuracy of the
installation. Please especially note the following:
– Structure
– Shielding
– Earthing
l
In the case of a differing installation it is required for evaluating the conformity to the EMC
Directive to check the system with regard to compliance with the EMC limit values. This for
instance applies to:
– The use of unshielded cables
l
The end user is responsible for compliance with the EMC Directive.
– If you observe the following measures, you can be sure that no EMC problems will occur
during operation and that the EMC Directive or the EMC law is met.
– If devices which do not meet the CE requirement with regard to noise immunity
EN 61000−4−2 are actuated near the system, these devices can be affected
electromagnetically by the system.
Structure
l
Connect device to the earthed mounting plate:
– Mounting plates with an electroconductive surface (zinc−coated or stainless steel) allow for
continuous contacting.
– Coated plates are not suitable for an EMC−compliant installation.
l
If you use several mounting plates:
– Connect mounting plates to each other on a large surface and in a conductive manner (e.g.
by means of copper strips).
l
When installing the cables, observe a spatial separation of signal and mains cables.
l
Route the cables as near to the reference potential as possible. Freely suspended cables act
like aerials.
Shielding
l
Preferably only use cables with a braid.
l
The coverage of the shield should be more than 80%.
l
In the case of data lines for a serial coupling, always use metallic or metallised plugs. Connect
the shield of the data line on the connector shell.
Earthing
l
Earth all metallically conductive components by the use of corresponding cables from a
central earthing point (PE rail).
l
Comply with the minimum cross−sections defined in the safety instructions:
– With regard to EMC, however, not the cable cross−section, but the surface of the cable and
of the extensive contacting is decisive.
