2-37
2-3-3 Wiring Products Conforming to EMC Directives
Models conforming to EC Directive will meet the requirements of the EMC Directives EN55011 Class A
Group 1 (EMI) and EN50082-2 (EMS) if they are wired under the conditions described in this section. If
the connected devices, wiring, and other conditions cannot be made to fulfill the installation and wiring
conditions when the product is incorporated into a machine, the compliance of the overall machine must
be confirmed.
The following conditions must be met to conform to EMC Directives.
•
The Servo Driver must be installed in a metal case (control panel).
•
Noise filters and surge absorbers must be installed on all power supply lines.
•
Shielded cables must be used for all I/O signal lines and encoder lines. (Use tin-plated, soft copper
wires for the shield weaving.)
•
All cables leaving the control panel must be wired in metal ducts or conduits with blades.
•
Ferrite cores must be attached to the shielded cable and the shield must be clamped directly to the
ground plate to ground it.
H
Wiring Methods
1 m max.
0.5 m
max.
2 m
max.
AC power
supply
Contactor
Metal
duct or
conduit
Ground (100
Ω
max.)
Metal plate
Control panel
Noise
filter
Brake pow-
er supply
Noise
filter
Surge
absorber
Controller
power
supply
Controller
Grounding plate
Controller
Clamp
Ferrite
core
Metal
duct or
conduit
Ferrite
core
Clamp
Note 1. The cable winding for the ferrite core must be 1.5 turns.
Note 2. Remove the sheath from the cable and ground it directly to the metal plate at the clamps.
Clamp
•
Ground the motor’s frame to the machine ground when the motor is on a movable shaft.
•
Use the grounding plate for the protective earth 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
2
, and arrange the wiring so that the ground lines
are as short as possible.
•
If no-fuse breakers (MCCB) 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.
System Design and Installation
Chapter 2
