Lenze 8240 frequency inverters - Manual (Page 30)

Installation
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4.3 Installation of a CE-typical drive system
General
notes
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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 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 50082-2 are operated
close to the controller, these devices may be interfered electromagnetically by the controllers.
Assembly
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Connect controller, mains choke, and mains filter to the grounded mounting plate with a wire of large a
cross-section as possible:
- Mounting plates with conductive surfaces (zinc-coated, stainless steel) allow permanent contact.
- Varnished boards should not be used for installation in accordance with EMC
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If you use several mounting plates:
- Connect as much surface as possible of the mounting plates (e.g. with copper bands).
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Ensure the separation of motor cable and signal or mains cable.
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Do not use the same terminal strip for mains input and motor output.
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Cable guides as close as possible to the reference potential. Unguided cables have the same effect as aerials.
Filters
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Use mains filters or RFI filters and mains chokes which are assigned to the controller:
- RFI filters reduce impermissible high-frequency interference to a permissible value.
- Mains chokes reduce low-frequency interferences which depend on the motor cable and its length.
- Mains filters combine the functions of mains choke and RFI filter.
Screening
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Connect the screen of the motor cable with the controller
- to the screen connection of the controller.
- additionally to the mounting plate with a surface as large as possible.
- Recommendation: For the connection, use ground clamps on bare metal mounting surfaces.
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If contactors, motor-protecting switches or terminals are located in the motor cable:
- Connect the screens of the connected cables also to the mounting plate, with a surface as large as possible.
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Connect the screen to PE, with a surface as large as possible.
- Metal glands at the motor terminal box ensure a connection of the screen and the motor housing.
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If the mains cable between mains filter and controller is longer than 300 mm:
- Screen mains cables.
- Connect the screen of the mains cable directly to the inverter and to the mains filter and connect it to the
mounting plate with as large a surface as possible.
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Use of a brake chopper:
- Connect the screen of the brake resistor cable directly to the mounting plate, at the brake chopper and the brake
resistor with as large a surface as possible.
- Connect the screen of the cable between controller and brake chopper directly to the mounting plate, at the
inverter and the brake chopper with a surface as large as possible.
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Screen the control cables:
- Connect both screen ends of the digital control cables.
- Connect one screen end of the analog control cables.
- Always connect the screens to the screen connection at the controller over the shortest possible distance.
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Application of the controllers 821X/822X/824X in residential areas:
- Use an additional screen damping ³ 10 dB to limit the radio interference. This is usually achieved by installation
in enclosed and grounded control cabinets made of metal.
Grounding
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Ground all metallically conductive components (controller, mains filter, motor filter, mains choke) using suitable
cables connected to a central point (PE bar).
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Maintain the minimum cross-sections prescribed in the safety regulations:
- For EMC, not the cable cross-section is important, but the surface and the contact with a cross-section as large
as possible, i.e. large surface.
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