4. WIRING
4－18
4.5 Wiring Procedure
The Servo Amplifier is control unit to process signals of several mV or less.
Therefore, perform wiring observing the following items.
1 Input/output or sensor signal line
For the input/output or sensor signal line, use recommended cables or their equivalent
(twisted wires or multi-conductor twisted lump shielded wires). Wire them by taking the
following precautions into account.
• Wire them in the shortest distance.
• Separate the main circuit line from the signal circuit line.
• Do not wire the main circuit line on the side of the amplifier or near another amplifier.
• We recommend to use an "insulation sleeve-equipped bar terminal" if a certain
insulation distance is required to be secured between main circuit wires or between
main and signal circuit wires.
(This terminal cannot be used when AWG12 wire is used.)
2 Earth cable
• Earth the wire with the diameter of 2.0 mm
2
at one point.
• Perform class 3 earth (earth resistance value: 100 Ω max.).
• Be sure to connect the frame of the Servomotor (the grounding wire and the terminal)
to the PE (protective earth) terminal ( ) of the Servo Amplifier.
• Be sure to connect the PE (protective earth) terminal ( ) for the Servo Amplifier to
that for the control panel. Be sure to ground it at one point.
3 Measures against malfunction due to noise
Note the following to prevent malfunction due to noise.
• Arrange the noise filter, the Servo Amplifier, and the upper controller as near as
possible.
• Be sure to install a surge absorbing circuit on the coils for the relay, the magnetic
contactor, the induction motor and the brake solenoid.
• Don’t pass main circuit signal lines in the same duct or overlap them.
• When a large noise source such as an electric welding machine or an electric
discharge machine exists nearby, insert a noise filter into the power supply and the
input circuit.
• Don't bind the noise filter primary and secondary side wires together.
• Don't make the earth cable longer.
4 Measure against radio interference
Since the Servo Amplifier is an industrial equipment, no measure against radio
interference has been taken to it. If the interference causes some problem, insert a line
filter to the power line input.
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