DOOSAN SERVO
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1.4 Wiring
▶
For signal lines and encoder lines, use twisted lines or multi-core shielded twisted-pair lines.
The length for reference input lines should be a maximum of 3m, and the encoder line should
be a maximum of below 10m.
Wiring must be done in shortest distance and the remaining length should be cut.
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The ground circuit should be a thick line. Usage of class 3 ground or above (ground resistance
100
Ω
or less) is recommended. Also, make sure to ground at one-point grounding.
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The following precautions should be taken to avoid malfunction due to noise.
- The noise filter should be placed as near as possible.
- Mount a surge absorbing circuit to the coil of the relay, electromagnetic contacts, solenoids
and etc.
- The power line (AC input, motor input line) and the signal line should be placed 30 cm apart
or more. Do not run them in the same duct or in a bundle.
- When the same power source is used, as for an electric welder or electrical discharge
machine or when a high-frequency noise source is present, attach noise filter to the power or
the input circuits.
- The cable line for the signal line is only 0.2 ～ 0.3 mm
2
, thus excessive force to the line
should be avoided to prevent damages.
1.5 Noise treatment
The effect of the switching noise depending on the wiring or the grounding method should be
reduced as much as possible. Outside noise should be reduced as much as possible.
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Grounding method
The servo driver supplies power to the motor according to the switching of the IPM device.
Thus the Cf dv/dt current flows from the power component to the floating capacity of the motor.
To prevent the effect of the switching noise, the motor frame terminal should be connected to
the PE terminal of the servo driver terminal block and the PE terminal of the servo driver
should be directly grounded to standard ground panel.
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Noise filter
Noise filter is used in order to prevent noise from the power line. Please refer to the following
conditions while installing.
(a) Separate the input and output wiring and do not bundle them together or run them in the
same duct.
(b) Do not bundle or run the ground wire with the filter output line or other signal lines in the
same duct.
(c) The ground lead should be wired singly to the ground panel.
(d) If the unit contains the filter, connect the filter and the equipment ground to the base of the
unit.
(e) Please use the following recommended noise filter.
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