Mitsubishi Electric MELSERVO-J3W Series Instruction Manual page 229

11. OPTIONS AND AUXILIARY EQUIPMENT
Noise transmission route
1) 2) 3)
4) 5) 6)
7)
8)
Instrument
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 control box 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.
1. Provide maximum clearance between easily affected devices and the servo amplifier.
2. Provide maximum clearance between easily affected signal cables and the I/O cables of the servo
amplifier.
3. Avoid laying the power lines (Input cables of the servo amplifier) and signal cables side by side or
bundling them together.
4. Insert a line noise filter to the I/O cables or a radio noise filter on the input line.
5. Use shielded wires for signal and power cables or put cables in separate metal conduits.
When the power lines and the signal cables 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.
1. Provide maximum clearance between easily affected devices and the servo amplifier.
2. Provide maximum clearance between easily affected signal cables and the I/O cables of the servo
amplifier.
3. Avoid laying the power lines (I/O cables of the servo amplifier) and signal cables side by side or bundling
them together.
4. Use shielded wires for signal and power cables or put the cables in separate metal conduits.
When the power supply of peripheral devices 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.
1. Insert the radio noise filter ( FR-BIF ) on the power cables (Input cables) of the servo amplifier.
2. Insert the line noise filter (FR-BSF01) on the power cables of the servo amplifier.
When the cables of peripheral devices are connected to the servo amplifier to make a closed loop circuit,
leakage current may flow to malfunction the peripheral devices. If so, malfunction may be prevented by
disconnecting the grounding cable of the peripheral device.
2)
7)
1)
Receiver
3)
Servo motor
Suppression techniques
11 - 44
5)
7) 7)
Sensor
power
supply
Servo
2)
amplifier
6)
Sensor
4)
3)
M
8)