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MELSEC-Q
4 INSTALLATION, WIRING AND MAINTENANCE OF THE PRODUCT
[Wiring examples using duct (incorrect example and corrected example)]
Relay
Servo
amplifier
Noise source
PLC
QD
75
Changed
Control panel
(Power system,
etc.)
Control panel
Servo
amplifier
Relay
Relay
Noise source
(Power system,
etc.)
Relay Relay
Relay
PLC
QD
75
Servo
amplifier
Servo
amplifier
The servo amplifiers are placed
near the noise source.
The connection cable between
the QD75 and servo amplifiers is
too long.
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.
Wiring duct
Wiring duct
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).
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