Omron SYSDRIVE 3G3MV SERIES User Manual page 71

Design
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.
Inverter wiring diagram
Three-phase
noise filter
Ground surface
Ground
surface
MV-series
Inverter
Shielded
cable
Shield grounding method
Cable clamp
(conductive)
Braided shield
Chapter 2
Ground plate
2-39