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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
MELSERVO-J2M or run near MELSERVO-J2M, 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 MELSERVO-J2M.
2. Provide maximum clearance between easily affected signal cables and the I/O cables of
MELSERVO-J2M.
3. Avoid laying the power lines (I/O cables of MELSERVO-J2M) 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 MELSERVO-J2M.
2. Provide maximum clearance between easily affected signal cables and the I/O cables of
MELSERVO-J2M.
3. Avoid laying the power lines (I/O cables of MELSERVO-J2M) 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 MELSERVO-J2M
system, noises produced by MELSERVO-J2M 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 MELSERVO-J2M.
2. Insert the line noise filter (FR-BSF01
FR-BLF) on the power cables of MELSERVO-J2M.
8)
When the cables of peripheral devices are connected to MELSERVO-J2M 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
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-25 of NEC TOKIN are available as data
line filters.
As a reference example, the impedance specifications of the ZCAT3035-1330 (TDK) are indicated
below.
This impedances are reference values and not guaranteed values.
Impedance[ ]
10 to 100MHZ 100 to 500MHZ
80 150
Outline drawing (ZCAT3035-1330)
[Unit: mm]([Unit: in.]
)
Loop for fixing the
cable band
Lot number
Product name
TDK
39 1(1.54 0.04)
34 1
(1.34 0.04)
1
3
1
(
0
.
5
1
0
.
0
4
)
3
0
1
(
1
.
1
8
0
.
0
4
)