Mitsubishi Electric MELSERVO-J5 MR-J5 Series User Manual page 218

Noise transmission
route
(1), (2), (3)
(4), (5), (6)
(7)
(8)
6 OPTIONS AND PERIPHERAL EQUIPMENT
216
6.14 Noise reduction techniques
Suppression techniques
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.
When the power lines and the signal lines are laid side by side or bundled together, magnetic induction noise and static
induction noise are transmitted through the signal cables, and malfunctions 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 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.
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(-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 disconnecting the grounding
wires from the equipment.