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1 Installation
MITSUBISHI CNC
1-6 Noise measures
Noise includes "propagation noise" generated from the relay, etc., and propagated along a cable causing the
drive unit to malfunction, and "radiated noise" propagated through air from a peripheral device, etc., and
causing the power supply unit or drive unit to malfunction.
Always implement these noise measures to prevent the peripheral devices and unit from malfunctioning. The
measures differ according to the noise propagation path, so refer to the following explanation and take
appropriate measures.
(1) General noise measures
(a) Avoid laying the drive unit's power line and signal wire in a parallel or bundled state. Always
separate these wires. Use a twisted pair shielded wire for the detector cable and signal wires such
as the communication cable connected with the NC unit, and accurately ground the devices.
(b) Use one-point grounding for the drive unit and motor.
(c) Accurately ground the AC reactor.
(2) Propagation noise measures
Take the following measures when noise generating devices are installed and the drive unit could
malfunction.
(a) Install a surge killer on devices (magnetic contacts, relays, etc.) which generate high levels of
noise.
(b) Install a power line filter in the stage before the drive unit.
(c) Install a ferrite core on the signal wire.
(d) Ground the shield of the servo detector's cable with a cable clamp.
(e) Wire the spindle PLG detector cable away from other wires.
(3) Measures against radiated noise
The types of propagation paths of the noise and the noise measures for each propagation path are
shown below.
Noise generated from
drive unit
Noise directly radiated
from drive unit
Airborne
propagation noise
Path [1]
Noise radiated from
power line
Magnetic induction
noise
Path [2]
Path [4]
and [5]
Noise radiated from
servomotor/spindle motor
Static induction
noise
Path [3] Path [6]
Noise propagated over
power line
Cable propagation
noise
Path [7]
Noise lead in from
grounding wire by
leakage current
Path [8]