Omron OMNUC R88D-WT15HF User Manual page 237

System Design and Installation
• Use ground lines with a minimum thickness of 3.5 mm
are as short as possible.
• If no-fuse breakers are installed at the top and the power supply line is wired from the lower duct, use
metal tubes for wiring and make sure that there is adequate distance between the input lines and the
internal wiring. If input and output lines are wired together, noise resistance will decrease.
• No-fuse breakers, surge absorbers, and noise filters (NF) should be positioned near the input terminal
block (ground plate), and I/O lines should be isolated and wired using the shortest distance possible.
• If surge absorbers are installed, incorporate a fuse to protect against short-circuit failure. As a guide,
select a fuse with approximately three times the maximum momentary current.
• Wire the noise filter as shown at the left in the following illustration. The noise filter should be installed
at the entrance to the control box whenever possible.
Correct: Separate input and output
AC input
Ground
• Use twisted-pair cables for the power supply cables whenever possible, or bind the cables.
Correct: Properly twisted
• Separate power supply cables and signal cables when wiring.
H Selecting Components
This section explains the criteria for selecting the connection components required for
improving noise resistance. These criteria include capacity performance, applicable
range, and so on. For more details, contact the manufacturers directly.
3-22
2
, and arrange the wiring so that the ground lines
AC output
Driver
or
WRONG: Noise not filtered effectively
AC input
Ground
AC output
Correct: Cables are bound.
Binding
Chapter 3
Driver