Lenze 8200 motec frequency inverter 0.25kW-7.5kW - Manual (Page 32)

Installation
Electrical installation − Installation according to EMC requirements
4−7
L
EDB82MV752 EN 5.2
4.2.2 Installation according to EMC
The electromagnetic compatibility (EMC) of a machine depends on the type of installation and the
care taken.
If you observe the following measures, you can assume that the machine will operate without any
EMC problems caused by the drive system.
4.2.2.1 Assembly
·
Ensure the separation of motor cable and signal or mains cables.
·
Do not use the same terminal strip for mains input and motor output.
·
Rout cables as close as possible to the reference potential. Freely suspended cables have the
same effect as aerials.
4.2.2.2 Filters
·
Only use RFI filters and mains chokes which are assigned to the controllers:
– RFI filters reduce impermissible high−frequency interferences to a permissible value.
– Mains chokes reduce the effective current consumption of the frequency inverter on the
mains.
4.2.2.3 Shielding
·
Use shielded, low−capacitance motor cable. Capacitance per unit length:
– Core/core
£ 75 pF/m
– Core/shield £ 150 pF/m
·
Connect the shield to the shield sheets in the motec with a large surface
·
Connect the shield with PE in the terminal box of the motor:
– Metal cable glands at the motor terminal box ensure a large surface connection of the shield
to the motor housing.
·
If you use a brake resistor:
– Connect the shield of the brake resistor cable directly at the frequency inverter and the
brake resistor to the mounting plate with a large surface.
·
Shield control cables:
– Connect control cable shields at both ends.
4.2.2.4 Earthing
·
Earth all components (controllers, RFI filters, motor filters, mains chokes) using suitable cables
connected to a central earthing point (PE rail).
·
Maintain the defined minimum cross−sections:
– For EMC, the surface of the cable with a large−surface contact is decisive, i.e. as large
cross−sections as possible (large surface).