Omron SMARTSTEP R7D-AP Series User Manual page 176

System Design and Installation
• If Servomotors with brakes are used, do not share the 24-V DC power supply for brakes with the
24-V DC power supply for control I/O. Additionally, do not connect ground wires. Connecting ground
wires may cause I/O signal errors.
• As much as possible, keep the power supply for pulse command and deviation counter reset input
lines separate from the control power supply. Be particularly careful not to connect the two power
supply ground lines.
• It is recommended that a line driver be used for pulse command and deviation counter reset out-
puts.
• Always use twisted-pair shielded cable for 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- µ F lami-
nated ceramic capacitors between the control power supply and ground at the Servo Driver input
section or the controller output section.
• For open-collector specifications, keep the length of wires to within two meters.
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Chapter 3