Basics for wiring according to EMC
Motor cable
5.3
5.3.3
5.3−2
EDSVF9383V EN 7.1−04/2012
5.3.3 Motor cable
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 meet the requirements of the application (e.g.
EN 60204−1).
ƒ The cable for the motor temperature monitoring (PTC or thermal
contact) must be shielded and separated from the motor cable.
– With Lenze system cables, the cable for the motor temperature
monitoring is integrated into the motor cable.
ƒ Always place the shield of the motor cable at both sides − at the drive
controller and at the motor.
– Always connect the shields to the conductive and grounded
mounting plate with a surface as large as possible.
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.
ƒ If it is inevitable to have an interruption (e.g. through chokes,
contactors or terminals):
– The unshielded cable must not be longer than 100 mm (depending
on the cable cross−section).
– Chokes, contactors, terminals, etc. must be separated from other
components (min. distance = 100 mm).
– The motor cable shield must be connected to the mounting plate
with a surface as large as possible directly before and after the point
of interruption.
ƒ Connect the shield in the motor terminal box or at the motor housing
to PE with a surface as large as possible.
– Metal cable glands at the motor terminal box ensure that the shield
is connected to the motor housing with a surface as large as possible.
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