Chapter 3
3-27
Setup and Wiring
• Use the shortest ground wire possible. For 400-V Inverters, ground the neutral point on the power
supply. Ground the metal control panel (and doors) at the same time.
• Use a shielded cable for the cable between the Inverter and motor as well. Keep the cable as short
as possible (20 m max.) and ground the shield at both ends of the cable. It is effective to mount a
clamp filter right next to the Inverter's output terminals.
• Use a conductive cable clamp to directly ground the shield to the ground plate.
• Ground the motor frame directly and connect the ground from the motor directly to the EMC-compli-
ant input noise filter.
• Use a ZCAT3035-1330 Clamp Filter on the communications cable, wind the cable in a loop around
it, and keep it away from the control panel.
• Use conductive packing on the doors of the control panel to increase shielding.
• Do not mount any wireless or other devices designed to generate electromagnetic waves.
• Use reinforced insulation or double insulation for the DC power supply for communications.
• The Inverter's control terminals have only basic insulation. Further insulation must be provided if
the terminals are wired to a device that will ultimately come in contact with people.
Grounding the Shield
Cable clamp
(conductive)
Shield mesh
Ground plat
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