Installation
page 54
ELTROPLAN-REVCON
4.6
Installation of a power feedback unit in a
CE-typical drive system
General
•
The user is responsible for the compliance of his application with the EC directives
.
-
If you observe the following measure you can be sure that the drive system will not
cause any power-feedback-unit-caused EMC problems, i.e. comply with the EMC
Directive when running the machine.
-
If devices which do not comply with the CE requirement concerning noise immunity
EN 500082-2 are operated close to the power feedback unit, these devices may be in-
terfered electromagnetically by the power feedback units.
Assembly
•
Connect the power feedback unit and the RFI-filter to the grounded mounting plate with a
wire of large cross section as possible:
–
Mounting plates with conductive surfaces (zinc-coated or stainless steel) allow per-
manent contact.
–
Varnished boards should not be used for installation in accordance with EMC.
•
If you use several mounting plates:
–
Connect as much surface of the mounting plates as possible (e.g. with copper bands)
•
Ensure the separation of power and control cables.
•
Cable guides as close as possible to the reference potential. Unguided cables have the same
effect as aerials.
Filters
•
Use RFI filters which are assigned to the power feedback unit.
RFI filters reduce impermissible high frequency interference to a permissible value.
Screening
•
Metallic cable glands ensure a big-surface connection between screen and housing
•
If the screened wire are interrupted at relays or terminals:
-
Connect the screens of the wires with a big surface to the mounting plate.
•
If the mains wires between RFI-filter and power feedback unit are longer than 300mm:
-
Use screened mains wires
-
Connect the screen direct at the controller / power feedback unit and at the RFI-filter to
the mounting plate.
•
Screen the control wires:
-
Connect the screens on the shortest possible way to their terminals.
Earthing
•
All metallic conduction components (power feedback unit, controller,
RFI-filter) have to be connected to one common earthing point (PE-bus bar).
•
Observe the in the safety guidelines defined minimum cross sections:
-
For EMC not the cross section, but the surface of a wire and the contact to the mount-
ing plate is important for the function.