3-42
•
When installing noise filters for Encoder Cables, use clamp filters. The following table shows the rec-
ommended clamp filter models.
Maker
Name
Model
Tokin
EMI core
ESD-SR-25
TDK
Clamp filter
ZCAT2032-0930
p
ZCAT3035-1330
ZCAT2035-0930A
•
Do not place the Encoder Cable in the same duct as Power Cables and Control Cables for brakes,
solenoids, clutches, and valves.
H
Improving Control I/O Signal Noise Resistance
Positioning can be affected if control I/O signals are influenced by noise. Follow the methods outlined
below for the power supply and wiring.
•
Use completely separate power supplies for the control power supply (especially 24 V DC) and the
external operation power supply. In particular, be careful not to connect the two power supply ground
wires. Install a noise filter on the primary side of the control power supply.
•
As much as possible, keep the power supply for pulse command and deviation counter reset input
lines separate from the control power supply. Be particularly careful not to connect the two power sup-
ply ground lines.
•
It is recommended that a line driver be used for pulse command and deviation counter reset outputs.
•
Always use twisted-pair shielded cables for pulse command and deviation counter reset signal lines,
and connect both ends of the shield to frame grounds.
•
Always use twisted-pair shielded cable for speed and torque command signal lines, and connect both
ends of the shield to frame grounds.
•
If the control power supply wiring is long, noise resistance can be improved by adding 1-
µ
F laminated
ceramic capacitors between the control power supply and ground at the Servo Driver input section or
the controller output section.
•
For encoder output (phase-A, -B, and -Z) lines, be sure to use twisted-pair shielded cable, and con-
nect both ends of the shield to frame grounds.
•
For open-collector specifications, keep the length of wires to within two meters.
System Design and Installation
Chapter 3
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