Mitsubishi MELDAS MDS-C1 Instruction Manual page 33

Example) Drive system
Instru-
ment
Noise
propagation
path
When devices such as instrument, receiver or sensor, which handle minute signals
and are easily affected by noise, or the signal wire of these devices, are stored in
the same panel as the drive units and the wiring is close, the device could
malfunction due to airborne propagation of the noise. In this case, take the following
measures.
(1) Install devices easily affected as far away from the drive units as possible.
<1> <2> <3> (2) Lay devices easily affected as far away from the signal wire of the drive unit as
(3) Avoid laying the signal wire and power line in a parallel or bundled state.
(4) Insert a line noise filter on the input/output wire or a radio filter on the input to
(5) Use a shield wire for the signal wire and power line, or place in separate metal
If the signal wire is laid in parallel to the power line, or if it is bundled with the power
line, the noise could be propagated to the signal wire and cause malfunction
because of the magnetic induction noise or static induction noise. In this case, take
the following measures.
(1) Install devices easily affected as far away from the drive unit as possible.
<4> <5> <6>
(2) Lay devices easily affected as far away from the signal wire of the drive unit as
(3) Avoid laying the signal wire and power line in a parallel or bundled state.
(4) Use a shield wire for the signal wire and power line, or place in separate metal
If the power supply for the peripheral devices is connected to the power supply in
the same system as the drive units, the noise generated from the power supply unit
could back flow over the power line and cause the devices to malfunction. In this
<7>
case, take the following measures.
(1) Install a radio filter on the power supply unit's power line.
(2) Install a power filter on the power supply unit's power line.
If a closed loop is created by the peripheral device and drive unit's grounding wire, a
leakage current could flow and cause the device to malfunction.
<8>
In this case, change the device grounding methods and the grounding place.
1. Installation
<2>
<7>
<1>
Receiver
<3>
Servomotor
Spindle motor
possible.
suppress the noise radiated from the wires.
ducts.
possible.
ducts.
<5>
<2>
Drive
unit
<6>
<4>
M
Measures
1 - 21
<7>
Sensor
power
supply
<8>
Sensor