SMC Networks LECSB Series, Руководство по эксплуатации

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12. OPTIONS AND AUXILIARY EQUIPMENT
Noise transmission route Suppression techniques
1) 2) 3)
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 driver or run near
the driver, 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 driver.
2. Provide maximum clearance between easily affected signal cables and the I/O cables of the driver.
3. Avoid laying the power lines (Input cables of the driver) 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.
4) 5) 6)
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 driver.
2. Provide maximum clearance between easily affected signal cables and the I/O cables of the driver.
3. Avoid laying the power lines (I/O cables of the driver) 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.
7)
When the power supply of peripheral devices is connected to the power supply of the driver system,
noises produced by the driver 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-(H) (Mitsubishi Electric Corporation)) on the power cables (Input
cables) of the driver.
2. Insert the line noise filter (FR-BSF01 FR-BLF (Mitsubishi Electric Corporation)) on the power cables
of the driver.
8)
When the cables of peripheral devices are connected to the driver 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) Noise reduction products
(a) Data line filter (Recommended)
Noise can be prevented by installing a data line filter onto the encoder cable, etc.
For example, the ZCAT3035-1330 of TDK and the ESD-SR-250 of NEC TOKIN make are available as
data line filters.
As a reference example, the impedance specifications of the ZCAT3035-1330 (TDK) are indicated
below.
This impedances is reference values and not guaranteed values.
Impedance [ ]
Outline drawing (ZCAT3035-1330)
[Unit: mm]
Loop for fixing the
cable band
Lot number Product name
TDK
39 1
34 1
13
1
30
1
10 to 100MHz 100 to 500MHz
80 150