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4-3 Wiring Conforming to EMC Directives
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
4
System Design
Improving Control I/O Signal Noise Resistance
Positioning can be affected and I/O signal errors can occur if control I/O is influenced by noise.
Use completely separate power supplies for the control power supply (especially 24 VDC) and the
external operation power supply. In particular, do not connect the 2 power supply ground wires.
Install a noise filter on the primary side of the control power supply.
If motors with brakes are being used, do not use the same 24-VDC power supply for both the
brakes and the control I/O. Additionally, do not connect the ground wires. Connecting the ground
wires may cause I/O signal errors.
If the control power supply wiring is long, noise resistance can be improved by adding 1-
µF
laminated ceramic capacitors between the control power supply and ground at the drive input
section or the controller output section.
Reactor to Reduce Harmonic Current
Harmonic Current Measures
Use a Reactor to suppress harmonic currents. The Reactor functions to suppress sudden and
quick changes in electric currents.
The Guidelines for Suppressing Harmonic Currents in Home Appliances and General Purpose
Components requires that manufacturers take appropriate remedies to suppress harmonic
current emissions onto power supply lines.
Select the proper Reactor model according to the Servo Drive to be used.
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