12 - 13
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
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 (I/O 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.
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 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.
7)
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 on the power cables (I/O cables) of the servo amplifier.
(2) Insert the line noise filter on the power cables of the servo amplifier.
8)
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) Noise reduction products
(a) Data line filter
Noise can be prevented by installing a data line filter onto the encoder cable, etc.
Example: Data line filter: ZCAT3035-1330 [TDK]
ESD-SR-25 [Tokin]
Impedance specifications (ZCAT3035-1330)
Impedance[
Ω
]
10 to 100MHZ
100 to 500MHZ
80
150
The above impedances are reference
values and not guaranteed values.
Outline drawing (ZCAT3035-1330)
[Unit: mm]([Unit: in.])
39
±
1(1.54
±
0.04)
φ
13
±
1
φ
30
±
1
Loop for fixing the
cable band
34
±
1
Lot number
Product name
TDK
(1.34
±
0.04)
(0.5
1
±
0.
04
)
(1.1
8
±
0.
04
)
