7 | Input / Output Description
24 | 44
Pump Control Instructions INVEOR VFD R5 COBRA_EN_en
7.2
Preventing Electromagnetic Interferences
Where possible use shielded lines for control circuits.
The shielding should be applied to the line end with special care and without laying the leads across
longer stretches without shielding.
Ensure that no parasitic currents (compensating currents etc.) can flow via the analogue cable's
shielding.
Route the control lines as far away as possible from the power lines. Under certain circumstances,
separate power ducts should be used.
If lines do cross, an angle of 90° should be observed.
Upstream circuit elements, such as protector switches and brake coils, or circuit elements that are
operated via the outputs of the drive controller have to be interference-suppressed. RC circuits are
suitable as AC voltage protector switches, while free-wheeling diodes or varistors are usually used as
DC voltage protector switches. These interference suppression devices are attached directly to the
protector switch coils.
NOTE
Where possible, the power for a mechanical brake should be supplied in a separate cable.
Power connections between the drive controller and motor should always be shielded or reinforced,
and the shielding must have large-scale grounding at both ends! The use of EMC cable screw
connections is recommended. These are not part of the scope of delivery.
Wiring suitable for EMC must be ensured.
