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4-3 Wiring Conforming to EMC Directives
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 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 lines.
• 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-μF
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 requires 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 Reactor
Model
Number of
power
phases
Model
Rated
current
Inductance Weight
R88D-GTA5L
Single-
phase
3G3AX-DL2002 1.6 A 21.4 mH Approx. 0.8 kg
R88D-GT01L
3G3AX-DL2004 3.2 A 10.7 mH Approx. 1.0 kg
R88D-GT02L
3G3AX-DL2007 6.1 A 6.75 mH Approx. 1.3 kg
R88D-GT04L
3G3AX-DL2015 9.3 A 3.51 mH Approx. 1.6 kg
R88D-GT01H
3G3AX-DL2002 1.6 A 21.4 mH Approx. 0.8 kg
R88D-GT02H
3G3AX-DL2004 3.2 A 10.7 mH Approx. 1.0 kg
R88D-GT04H
3G3AX-DL2007 6.1 A 6.75 mH Approx. 1.3 kg
R88D-GT08H
Single-
phase
3G3AX-DL2015 9.3 A 3.51 mH Approx. 1.6 kg
3-phase 3G3AX-AL2025 10.0 A 2.8 mH Approx. 2.8 kg
R88D-GT10H
Single-
phase
3G3AX-DL2015 9.3 A 3.51 mH Approx. 1.6 kg
3-phase 3G3AX-AL2025 10.0 A 2.8 mH Approx. 2.8 kg
R88D-GT15H
Single-
phase
3G3AX-DL2022 13.8 A 2.51 mH Approx. 2.1 kg
3-phase 3G3AX-AL2025 10.0 A 2.8 mH Approx. 2.8 kg
R88D-GT20H
3-phase
3G3AX-AL2055 20.0 A 0.88 mH Approx. 4.0 kg
R88D-GT30H
R88D-GT50H
3G3AX-AL2110 37.0 A 0.35 mH Approx. 5.0 kg
R88D-GT75H
3G3AX-AL2220 70.0 A 0.18 mH Approx. 10.0 kg
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