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Cabling Instructions
Keep individual unscreened wires between the cable clamps and the screw
terminals as short as possible. Route control cables away from power
cables.
Mains Cable
A three conductor cable (single phase and neutral with protective earth) or
four conductor cable (three phase with protective earth) are recommended
for the mains cabling. Shielding is not necessary. Dimension the cables and
fuses in accordance with the input current. Always pay attention to local
legislation when sizing the cables and fuses.
The mains input connectors are at the top of the converter unit. Mains cable
routing must be done so that the distance from the sides of the converter is
at least 20 cm to avoid excessive radiation to the mains cable. In the case of
screened cable twist the cable screen wires together into a bundle not longer
than five times its width and connect to the PE terminal of the converter. (Or
PE terminal of input filter, if present.)
Motor Cable
The motor cable must be a symmetrical three conductor cable with a
concentric PE conductor or a four conductor cable with a concentric shield.
Minimum requirement for the motor cable screen is presented in Figure 20.
Figure 20 Minimum requirement for motor cable screen (e.g. MCMK, NK
Cables).
The general rule for cable screen effectiveness is: the better and tighter the
screen of the cable, the lower the radiated emission level. Example of an
effective construction is presented in Figure 21.
Figure 21 Effective motor cable screen (e.g. Ölflex-Servo-FD 780 CP,
Lappkabel or MCCMK, NK Cables).
Twist the cable screen wires together into a bundle not longer than five times
its width and connect to the bottom left-hand corner of the converter heatsink
(terminal marked ).
L2
L1
L3
PE, optional
Helix of copper tape
Inner insulator
Copper wire screen
Insulation jacket
Insulation jacket
Braided metallic screen
Inner insulator
L2
L1
PE, optional
L3
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