Mitsubishi MELDAS HS Series Specifications And Instruction Manual page 51

Instru-
ment
Noise
propaga-tion
path
When devices such as instruments, receivers or sensors, 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 servo amplifier 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 servo amplifier as
possible.
① ② ③
(2) Lay the signals wires easily affected as far away from the input wire with the
servo amplifier.
(3) Avoid parallel wiring or bundled wiring of the signal wire and power wire.
(4) Insert a line noise filter on the input/output wire or a radio noise filter on the
input to suppress noise radiated from the wires.
(5) Use a shield wire for the signal wire and power wire, or place in separate
metal ducts.
If the signal wire is laid in parallel to the power wire, or if it is bundled with the
power wire, 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 servo amplifier as
④ ⑤ ⑥
possible.
(2) Lay the signals wires easily affected as far away from the input wire with the
servo amplifier.
(3) Avoid parallel wiring or bundled wiring of the signal wire and power wire.
(4) Use a shield wire for the signal wire and power wire, or place in separate
metal ducts.
If the power supply for the peripheral devices is connected to the power supply in
the same system as the servo amplifier, the noise generated from the servo
amplifier could back flow over the power supply wire and cause the devices to
⑦
malfunction. In this case, take the following measures.
(1) Install a radio noise filter on the servo amplifier's power wire.
(2) Install a line noise filter on the servo amplifier's power wire.
If a closed loop is structured by the peripheral device and servo amplifier's
grounding wires, the leakage current could penetrate and cause the devices to
⑧
malfunction. In this case, change the device grounding methods and the
grounding place.
Chapter 5 Installation
⑤
②
⑦
①
Receiver
③
Servomotor
5–8
⑦
②
Servo
amplifier
⑥
④
Sensor
SM
Measures
Sensor
power
supply
⑧