Wiring the standard device
Basics for wiring according to EMC
Shielding
5
5.2
5.2.1
5.2-1
EDSVF9333V EN 3.0-06/2005
5.2 Basics for wiring according to EMC
5.2.1 Shielding
The quality of shielding is determined by a good shield connection:
ƒ Connect the shield with a large surface.
ƒ Connect the shield directly to the intended shield sheet of the device.
ƒ In addition, connect the shield to the conductive and earthed mounting
platewithalargecontactsurfacebyusingaconductiveclamp.
ƒ Unshielded cable ends must be as short as possible.
5.2.2 Mains connection, DC supply
ƒ Drive controllers, mains chokes or mains filters may be connected to
the mains via unshielded single cores or cables.
ƒ If a mains filter or RFI filter is used, install a shielded cable between
mains filter or RFI filter and drive controller if it is longer than 300 mm.
ƒ For DC-bus operation or DC supply, use shielded cables.
ƒ The cable cross-section must be dimensioned for the corresponding
fusing (national and regional regulations must be observed).
5.2.3 Motor cables
ƒ Use only shielded motor cables with braid made of tinned or
nickel-plated copper. Shields made of steel braid are not suitable.
– The overlap rate of the braid must be at least 70 % with an overlap
angle of 90 °.
ƒ The cables used must comply with the requirements of the site of use
(e.g. EN 60204-1).
ƒ The cable for motor temperature monitoring (PTC or thermal contact)
must be shielded and separated from the motor cable.
– In the Lenze system cables, the cable for the motor temperature
monitoring is integrated in the motor cable.
ƒ Always place the shield of the motor cable at both sides - at the drive
controller and at the motor.
– Always place shields with large surface on the conducting and
earthed mounting plate. Also use the shield connections on the
device.
ƒ The motor cable is perfectly installed if
– it is routed separately of mains cables and control cables,
– crosses mains cables and control cables only at a right angle,
– is not interrupted.
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