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3.2 Good EMC Installation Techniques
1) Mount the COMBIVERT F5 on a
conductive (zinc or nickel plated not
painted) sub plate. This sub plate
serves as the central grounding point
for the machine.
2) Always connect the shield of motor
and control cables with maximum
surface area, use metal cable clamp
to contact cable shield on all sides.
Using a single strand of the shield
or the drain wire form the shield as
the only connection can reduce the
shield’s effectiveness by 70%.
3) The distance between control and
power cables should be at least 10..20
cm / 4...8 inches.
4) Keep the motor and power cable
spacially separated especially if
running parallel.
5) If it cannot be avoided, cross control
and power cables and motor cables
at a right angle.
6) Install all cables as close as possible
to the mounting plate - ideally in a
metal wireway.
7) Ridged metal conduit can be used as a shield for the motor cables. Always observe the
following points:
• Remove all paint from the control panel where the conduit is to be secured.
• Securely fasten all conduit fittings.
• Run only the motor wires through the conduit. All other wires must be pulled
through a separete conduit.
• Connect the control panel to the sub panel with a heavy ground strap.
8) If a KEB EMI (CE) filter is used, it must be mounted as close as possible and to the same
subpanel as the COMBIVERT F5 motor control. The filter must have large bare surface
contact with the subpanel. Use only the wires from the filter to connect to the inverter.
Never add additional lengths of wire.
9) All ground connections should be as short as possible. Always avoid creating ground
loops. NEC requires a ground conductor connected to every COMBIVERT F5 controller
inspite of the metal on metal connection to the subplate.
You can find further instructions regarding EMC and proper wiring considerations by contacting
KEB technical support or visiting the website www.kebamerica.de.
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Installation and Connection
