IACDRIVE I5000 Series Operation Manual page 26

electromagnetic noise greatly.
4.7.3.2 Site wiring
Power supply wiring: the power should be separated supplied from electrical transformer.
Normally it is 5 core wires, three of which are fire wires, one of which is the neutral wire, and one
of which is the ground wire. It is strictly prohibitive to use the same line to be both the neutral wire
and the ground wire
Device categorization: there are different electric devices contained in one control cabinet, such
as inverter, filter, PLC and instrument etc, which have different ability of emitting and withstanding
electromagnetic noise. Therefore, it needs to categorize these devices into strong noise device
and noise sensitive device. The same kinds of device should be placed in the same area, and the
distance between devices of different category should be more than 20cm.
Wire Arrangement inside the control cabinet: there are signal wire (light current) and power cable
(strong current) in one cabinet. For the inverter, the power cables are categorized into input cable
and output cable. Signal wires can be easily disturbed by power cables to make the equipment
malfunction. Therefore when wiring, signal cables and power cables should be arranged in
different area. It is strictly prohibitive to arrange them in parallel or interlacement at a close
distance (less than 20cm) or tie them together. If the signal wires have to cross the power cables,
they should be arranged in 90 angles. Power input and output cables should not either be
arranged in interlacement or tied.
together, especially when installed the EMC filter. Otherwise the distributed capacitances of its
input and output power cable can be coupling each other to make the EMC filter out of function.
4.7.3.3 Ground
Inverter must be ground safely when in operation. Grounding enjoys priority in all EMC methods
because it does not only ensure the safety of equipment and persons, but also is the simplest,
most effective and lowest cost solution for EMC problems.
Grounding has three categories: special pole grounding, common pole grounding and series-
wound grounding. Different control system should use special pole grounding, and different
devices in the same control system should use common pole grounding, and different devices
connected by same power cable should use series-wound grounding.
4.7.3.4 Leakage Current
Leakage current includes line-to-line leakage current and over-ground leakage current. Its value
depends on distributed capacitances and carrier frequency of inverter. The over-ground leakage
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