Omron ACCURAX G5 User Manual page 258

4-3 Wiring Conforming to EMC Directives
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.
Keep the power supply for pulse commands and error counter reset input lines separated from the
control power supply as far as possible. In particular, do not connect the 2 power supply ground
wires.
We recommend using line drivers for the pulse command and error counter reset outputs.
Always use twisted-pair shielded cable for the pulse command and error counter reset signal lines,
and connect both ends of the shield cable 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 driver input
section or the controller output section.
4
For open collector specifications, keep the length of wires to within 2 m.
4-34
Accurax G5 AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
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