Installation
EMC−compliant installation
Motor cable
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46
EDSMDAG EN 2.0
5.4.4
Motor cable
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Only use shielded motor cables with braids made of tinned or nickel−plated copper.
Shields made of steel braids are not suitable.
– The overlap rate of the braid must be at least 70 % with an overlap angle of 90 °.
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The cables used must correspond to the requirements at the location (e.g.
EN 60204−1).
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Use Lenze system cables.
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Extensively apply the shielding with the compressed cable gland and ensure
electrical conductivity.
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The motor cable is optimally installed if
– it is separated from mains cables and control cables,
– it only crosses mains cables and control cables at right angles,
– it is not interrupted.
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If the motor cable must be opened all the same (e.g. due to contactors, or terminals):
– The unshielded cable ends may not be longer than 100 mm (depending on the
cable cross−section).
– Install contactors, terminals etc. spatially separated from other components (with
a min. distance of 100 mm).
– Install the shield of the motor cable directly before and behind the point of
separation to the conducting mounting plate with a large surface.
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Connect the shield with a large surface to PE in the terminal box of the motor at the
motor housing.
– Metal EMC cable glands at the motor terminal box ensure a large surface
connection of the shield with the motor housing.
Wiring on the motor side
(
Stop!
The motor cable is highly susceptible to interference. The following measures
enable you to achieve an optimum wiring on the motor side:
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Exclusively use shielded and low−capacitance motor cables.
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If possible, integrate the equipotential bonding conductor inside the motor
cable shield or install it in parallel to the motor cable.
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Do
not
integrate any further cables (e.g. for blowers etc.).
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Shield the supply cable for temperature monitoring of the motor (PTC or
thermostat) and install it separately from the motor cable.
