Interference Protection Of Electric Systems; Interference Protection Of The Frequency Inverter - KEB COMBIVERT F4-F Betriebsanleitung

1.6 Interference Protection
of Electric Systems
1.7 Interference Protection of
the Frequency Inverter
1. Operating Specifications
The frequency inverter KEB COMBIVERT transmits waves of high
frequency. To reduce arising interference pulses, that may effect
electric systems in the vicinity of the frequency inverter, do the
following:
– Install the frequency inverter in metal housing.
– Shield motor cables.
The shield must be connected to PE of the frequency inverter
and to the housing of the motor (connect extensive shield). The
shielding shall not be used as protective earthing. Only an
uninterrupted shield beginning as close as possible to the
frequency inverter or motor ensures a safe function of the
shielding.
– Good earthing (metal-powder tape or 10 mm
– Use radio interference suppression filters.
The control and power inputs of the frequency inverter
are protected against interferences.
For more operational reliability and additional
protection against malfunctions following these
measures:
– Use of mains filter, when the mains voltage is affected by the
connection of large consumers (reactive-power compensation
equipment, HF-furnaces etc.)
– Protective wiring of inductive consumers (solenoid valves, relays,
electromagnets) with RC elements or similar devices to absorb
the energy released when the unit is switched off.
– Install wires, as described in the connection directions, to avoid
inductive and capacitive coupling of interference pulses.
Paired-twisted cables protect against inductive parasitic voltages,
shielding provides protection against capacitive parasitic
voltages. Optimal protection is achieved with twisted and shielded
cables when signal and power lines are installed separately.
ANTRIEBSTECHNIK
GB
2
earth lead)
GB 7