Mitsubishi Electric MELSERVO-J4 Series Instruction Manual page 420

Noise transmission
route
1) 2) 3)
4) 5) 6)
7)
8)
■Noise reduction techniques for the network cable
Take measures against noise for both ends of the network cable.
When using it in an environment with excessive noise, directly connect the shield of the network cable to the ground plate with
cable clamp fittings at a place 200 mm to 300 mm or less from the servo amplifier.
When connecting the network cable from outside the cabinet, connect it to the ground plate at a place 5 mm to 10 mm away
from the cabinet entrance.
To reinforce measures against noise, it is recommended to install a data line filter (TDK ZCAT1730-0730) to the network
cable. Install the data line filter to a place 80 mm or less from the servo amplifier.
• For inside the cabinet
11 OPTIONS AND PERIPHERAL EQUIPMENT
418
11.14 Noise reduction techniques
Suppression techniques
When measuring instruments, receivers, sensors, etc. which handle weak signals and may malfunction due to noise and/or
their signal cables are contained in a cabinet together with the servo amplifier or run near the servo amplifier, such devices may
malfunction due to noises transmitted through the air. The following techniques are required.
• Provide maximum clearance between easily affected devices and the servo amplifier.
• Provide maximum clearance between easily affected signal cables and the I/O cables of the servo amplifier.
• Avoid wiring the power lines (input/output lines of the servo amplifier) and signal lines side by side or bundling them together.
• Insert a line noise filter to the I/O cables or a radio noise filter on the input line.
• Use shielded wires for the signal and power lines, or put the lines in separate metal conduits.
When the power lines and the signal lines are laid side by side or bundled together, magnetic induction noise and static
induction noise will be transmitted through the signal cables and malfunction may occur. The following techniques are required.
• Provide maximum clearance between easily affected devices and the servo amplifier.
• Provide maximum clearance between easily affected signal cables and the I/O cables of the servo amplifier.
• Avoid wiring the power lines (input/output lines of the servo amplifier) and signal lines side by side or bundling them together.
• Use shielded wires for the signal and power lines, or put the lines in separate metal conduits.
When the power supply of peripheral equipment is connected to the power supply of the servo amplifier system, noises
produced by the servo amplifier may be transmitted back through the power supply cable and the devices may malfunction.The
following techniques are required.
• Install the radio noise filter (FR-BIF(-H)) on the power lines (Input lines) of the servo amplifier.
• Install the line noise filter (FR-BSF01/FR-BLF) on the power lines of the servo amplifier.
If the grounding wires of the peripheral equipment and the servo amplifier make a closed loop circuit, leakage current may flow
through, causing the equipment to malfunction. In this case, the malfunction may be prevented by the grounding wires
disconnected from the equipment.