Mitsubishi Electric MELSEC-Q QD75M User Manual page 88

4 INSTALLATION, WIRING AND MAINTENANCE OF THE PRODUCT
[Wiring examples using duct (incorrect example and corrected example)]
Control panel
Control panel
Relay
Servo Servo
amplifier amplifier
Noise source
(Power system,
etc.)
Relay
Noise source
(Power system,
etc.)
POINTS
(1) The noise reduction techniques might be decreased the noise by installing
ferrite core in the cable connected with QD75.
Refer to this manual and the servo amplifier manual for the noise reduction
technique related to the connection of servo amplifier and QD75.
(2) The influence of the noise is decreased by constructing the system
configuration which can suit EMC directive even when the agreement of EMC
directive is unnecessary.
To make this product conform to the EMC directive, please refer to chapter 3.
"EMC AND LOW-VOLTAGE DIRECTIVES" of the using PLC CPU module
User's Manual (Hardware).
Relay
Relay
QD
PLC
75
Changed
Relay
Relay
QD
PLC
75
Servo Servo
amplifier amplifier
4 - 13
MELSEC-Q
Wiring duct
The servo amplifiers are placed
near the noise source.
The connection cable between
the QD75 and servo amplifiers is
too long.
Wiring duct
The QD75 and servo amplifiers are
placed closely. The connection
cable between the QD75 and
servo amplifier is separately laid
from the power line (in this
example, the cable is outside of
the duct) and is as short as possible.