10.3 WIRING PRECAUTIONS
The following precautions should be taken for wiring.
(1) For signal lines and PC feedback lines, use twisted cables or multi-core shielded
twisted-pair cables (Yaskawa Drawing No.DP8409123, 0E8400093or B9400064). (See Table
5.5.)
Cable length is a maximum of 5 m for reference input lines (DG-SWunit, reference
pulse generator, display unit) and a maximum of 20 m for PC feedback lines. Use the
shortest possible length. Contact your YASKAWArepresentative for longer PG feedback
lines.
(2) For ground line, cable should be as heavy as possible to provide class 3 ground
(ground resistance 100_ or less). Make sure to ground at a central point. If the
motor and machine are insulated, ground the motor.
(3) To prevent malfunction due to noise, take the following precautions:
• Place the noise filter, Servopack and I/0 reference as near as possible to each
other.
• Make sure to mount a surge absorbing circuit with relays, electromagnetic contacts,
and solenoids.
• Run the power line and signal line, holding the distance to 30 cm or more; do not
run them in the same duct or in a bundle.
• When the same power source is used for Servopack, as for an electric welder or
electrical discharge machine or when a high-frequency noise source is present in
the vicinity, use filters in the power and input circuits.
• The Servopack uses a P_ amplifier, and spurious noise may be present in the signal
line.
(4) Remedy for Radio Frequency Interference (R.F.I.)
Servopack may interfere with radio reception. If the controller interferes with radio
reception, connect a noise filter to the power supply.
(5) The signal line uses cables whose core is extremely fine (0.2 to 0.3 mmZ). Avoid
using excessive force which may damage these cables.
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