Faulhaber 3242 BX4 Series, Техническое руководство

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4th edition, 26-08-2020 7000.05058, 4th edition, 26-08-2020 7000.05058
Installation
32
Problem solutions
The interference may vary depending on load and installation.
The mentioned variants are effective only if the following chapters are followed correctly.
4.3.2 Functional earthing
DANGER!
Danger to life through ground leakage currents
≥
3.5 mA

Check the earthing of the devices for proper installation.
The earthing system is essential for discharging parasitic current and for a potential distri-
bution in the system that is as uniform as possible. The most efficient systems have a star or
mesh shape. A star-shaped connection is easier to implement.

Ensure an adequate cross section and a very good electrical earth connection so that
the contact resistances are low not only for the low-frequency currents.
The earth connection can be improved, e.g., by removing the oxide layers from the ends
of conductors with fine sandpaper.
For electrical safety:

Earth in accordance with current standards and guidelines.

Use separate protective earth conductors for all necessary parts (e.g., mains supply, con-
troller).

Keep earthing cable as short as possible.
For functional earthing:

Use a braided shield that is meshed as tightly as possible.

Direct contact with the earth plate is to be preferred.
Therefore, avoid contact with the controller and then with the earth plate.

Connections made over a large surface area are to be preferred.
Solution Mode of action Benefits Disadvantages
3-phase common-mode
choke / ferrite ring around
all supply cables Removes common-mode
interference of the MCS
 Removes RF common-
mode interference
 Fast testing possible
 Does not remove all inter-
ference
 Fabrication necessary
Input filter upstream of
the controller
(e.g., EFS 5004 6501.00350
) Removes interference of
the switching regulator
and part of the motor
interference on DC net-
works Pass an interference volt-
age measurement with
correct wiring Does not remove interference
on the motor side
Mains filter upstream of
the switching power
supply Removes common-mode
interference of the
power supply Very cost-effective solu-
tion
 Often only effective for
power supply
 Does not remove all inter-
ference