Omron OMNUC FND Series User Manual page 92

Design and Installation
Use twisted-pair cables for the power supply cables whenever possible, or bind the cables.
Twisted Wires
Separate power supply cables and signal cables when wiring.
j Wiring Method for FND-X50H-
Noise resistance will vary greatly depending on the wiring method used. Resistance to noise can be
increased by paying attention to the items described below.
(Faulty grounding,
short-circuit
protection)
No-fuse
breaker
AC power supply
Ground
(to 100 Ω or less)
Ground
(Electric
plate
shock noise
protection)
Ground the motor's frame to the machine ground when the motor is on a movable shaft.
Use a grounding plate for the frame ground for each Unit, as shown in the illustration, and ground to a
single point.
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 means possible.
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R
Position
Driver
S
(Lightning surge
protection)
Noise filter
Surge
absorber
Fuse
Controller power supply
Control board
ground
Binding
Position
or
Driver
Binding
(Noise
protection)
Contactor
CN2
(M.SEN)
Protectively
separated
2
, and arrange the wiring so that the ground lines
Chapter 2
(Noise
protection)
Metal duct
Thick power line
2
(3.5 mm )
(Electrical shock,
noise protection)
Machine
ground