Specifications

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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.
4.4.3.3
4.4.3.3
4.4.3.3
4.4.3.3 Ground
Ground
Ground
Ground ing
ing
ing
ing
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