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D Wiring a Control Cable
• Be sure to connect a cable with a braided shield to the control circuit terminals.
• Ground the shield on the Inverter side only.
D Grounding the Shield
In order to ground the shield securely, it is recommended that a cable clamp be directly connected to the
ground plate as shown below.
D Other noise countermeasures
• Use cable with a braided shield for inverter power supply lines, keep the cable as short as
possible, and connect the cable through an EMC-conforming input noise filter. Be sure to con-
nect the shield to ground at both ends.
• Keep ground wires as short as possible. With a 400-V-class model, be sure to ground to a
neutral point on the power supply. This is also the time to ground the metal control panel (in-
cluding doors).
• Use cable with a braided shield between the Inverter and motor as well. Keep the cable as
short as possible (20 m max.), and be sure to connect the shield to ground at both ends.
Mount a clamp filter near the Inverter output terminal for more effective noise suppression.
• Ground the shield with a conductive cable clamp directly to the ground plate.
• Wire the motor frame directly to ground, and connect the ground wire from the motor directly
to an EMC-conforming input noise filter.
• Improve shielding by using conductive packing in the doors of the control panel.
Three-phase
noise filter
Ground
surface
Shielded
cable
MV-series
Inverter
Inverter wiring diagram
Ground surface
Cable clamp
(conductive)
Braided shield
Ground plate
Shield grounding method
Design Chapter 2
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