6 OPTIONS AND PERIPHERAL EQUIPMENT
6.10 Noise reduction techniques
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Noise reduction techniques for the network cable
Take measures against noise for both ends of the network cable.
If using the network cable in an environment with excessive noise, directly connect the shield of the cable to the ground plate
with cable clamp fittings at a place 200 mm to 300 mm from the servo amplifier.
When connecting the network cable from outside the cabinet, connect it to the ground plate 5 mm to 10 mm away from the
cabinet entrance.
To reinforce noise reduction techniques, installing a data line filter (TDK ZCAT1730-0730) to the network cable is
recommended. Install the data line filter to a place 80 mm or less from the servo amplifier.
• Inside the cabinet
When using cable clamp fittings
Noise transmission
route
Suppression techniques
(1), (2), (3)
A malfunction due to noise transmitted through the air may occur in devices which handle weak signals and are susceptible to
noise, such as measuring instruments, receivers and sensors. In addition, a malfunction may also occur when their signal
cables are stored in a cabinet together with the servo amplifier or when the signal cables run near the servo amplifier. Take the
following measures to prevent a malfunction:
• 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 bundling power lines (input/output lines of the servo amplifier) and signal cables together or running them in parallel to
each other.
• Insert a line noise filter to the I/O cables or a radio noise filter on the input line to reduce radiated noise from the cables.
• Use shielded wires for the signal and power lines, or put the lines in separate metal conduits.
(4), (5), (6)
When power cables and signal cables are laid side by side or bundled together, electromagnetic and static induction noise is
transmitted to the signal cables, causing malfunctions. Take the following precautions to protect the signal cables against
noise.
• 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 bundling power lines (input/output lines of the servo amplifier) and signal cables together or running them in parallel to
each other.
• Use shielded wires for the signal and power lines, or put the lines in separate metal conduits.
(7)
When the power supply of peripheral equipment is connected to the power supply of the servo amplifier system, noise
produced by the servo amplifier may be transmitted back through the power supply cable, and the equipment may malfunction.
The following techniques are required.
• Install the radio noise filter (FR-BIF) on the power lines (input lines) of the servo amplifier.
• Install the line noise filter (FR-BSF01) on the power lines of the servo amplifier.
(8)
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 disconnecting the grounding
wires from the equipment.
CN1A
200 mm to 300 mm
Cable clamp fitting
Servo amplifier
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Summary of Contents for Melservo-Jet MR-JET G-N1 Series
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