Lenze 8200 Frequency inverters - Manual (Page 101)

Installation
8200SHB0199 4-44
Screening - Connect the screen of the motor cable to 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.
- 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.
- Connect the screen in the motor terminal box or on the motor housing to PE:
- Metal glands at the motor terminal box ensure a connection of the screen and the motor housing.
- 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.
- 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.
- 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.
- Application of the controllers 821X/822X/824X in residential areas:
- Use an additional screen damping
˜ 10 dB to limit the radio interference. This is usually achieved by installation
in enclosed and grounded control cabinets made of metal.
Grounding - Ground all metallically conductive components (controller, mains filter, motor filter, mains choke) using suitable
cables connected to a central point (PE bar).
- Maintain the minimum cross-sections prescribed in the safety regulations:
- For EMC not the cable cross-section but the surface and the contact with a cross-section as large as possible,
are important.
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