Omron OMNUC G User Manual page 221

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 two power supply ground wires.
Install a noise filter on the primary side of the control power supply.
If Servomotors 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.
Keep the power supply for pulse commands and deviation counter reset input lines separated from
the control power supply as far as possible. In particular, do not connect the two power supply
ground wires.
We recommend using line drivers for the pulse command and deviation counter reset outputs.
Always use twisted-pair shielded cable for the pulse command and deviation counter reset signal
lines, and connect both ends of the shield to frame grounds.
If the control power supply wiring is long, noise resistance can be improved by adding 1-
laminated ceramic capacitors between the control power supply and ground at the Servo Drive
input section or the controller output section.
For open-collector specifications, keep the length of wires to within two meters.
Reactors to Reduce Harmonic Current
Harmonic Current Countermeasures
The Reactor is used for suppressing harmonic currents. It suppresses sudden and quick changes
in electric currents.
"The Guidelines for Suppressing Harmonic Currents in Home Appliances and General Purpose
Components" require that manufacturers take appropriate measures to suppress harmonic
current emissions onto power supply lines.
Select the proper Reactor model according to the Servo Drive to be used.
Servo Drive model
R88D-GNA5L-ML2
R88D-GN01H-ML2
R88D-GN01L-ML2
R88D-GN02H-ML2
R88D-GN02L-ML2
R88D-GN04H-ML2
R88D-GN04L-ML2
R88D-GN08H-ML2
R88D-GN10H-ML2
R88D-GN15H-ML2
R88D-GN08H-ML2
R88D-GN10H-ML2
R88D-GN15H-ML2
R88D-GN20H-ML2
R88D-GN30H-ML2
R88D-GN50H-ML2
R88D-GN75H-ML2
4-3 Wiring Conforming to EMC Directives
Reactor specifications
Model Rated current
3G3AX-DL2002 1.6 A
3G3AX-DL2004 3.2 A
3G3AX-DL2007 6.1 A
3G3AX-DL2015 9.3 A
3G3AX-DL2022 13.8 A
3G3AX-AL2025 10.0 A
3G3AX-AL2055 20.0 A
3G3AX-AL2110 34.0 A
3G3AX-AL2220 67.0 A
μ
F
Inductance
21.4 mH
10.7 mH
6.75 mH
3.51 mH
2.51 mH
2.8 mH
0.88 mH
0.35 mH
0.18 mH
4-40
4