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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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