Mitsubishi Electric MELSERVO-J2S Series Manual page 136

Instrument 計器
Route of Noise Transfer
Some modules such as instruments, receivers, and sensors operate with weak signals and, thus, tend to
suffer from malfunction caused by noises. If their signal lines are housed with the servo amplifier in
the same panel, or if such lines are arranged in the vicinity of the servo amplifier, they may suffer
from malfunction caused by airborne noises. In such a case, you should provide such countermeasures as
listed below:
1. When installing a module vulnerable to noises, place the module as far apart as possible from the servo
amplifier.
①②③
2. When arranging a signal line vulnerable to noises, place the line as far apart as possible from the
input/output lines to/from the servo amplifier.
3. Avoid arranging the signal lines in parallel with the drive lines (the input/output lines to/from the
servo amplifier). Avoid bundling them together for wiring.
4. Attach line noise filters and radio noise filters on the input/output lines to suppress the noises
emitted form the cables.
5. Use shielded lines as signal lines and drive lines. Use separate metal ducts to insulate them.
If a signal line is arranged in parallel with a drive line, and/or if a signal line is bundled with a
drive line, noises may be induced electromagnetically and/or electrostatically. Such noises may be
transferred to a signal line to cause malfunction. In such a case you should provide such countermeasures
as listed below:
1. When installing a module vulnerable to noises, place the module as far apart as possible from the servo
④⑤⑥ amplifier.
2. When arranging a signal line vulnerable to noises, place the line as far apart as possible from the
input/output lines to/from the servo amplifier.
3. Avoid arranging the signal lines in parallel with the drive lines (the input/output lines to/from the
servo amplifier). Avoid bundling them together for wiring.
4. Use shielded lines as signal lines and drive lines. Use separate metal ducts to insulate them.
If a peripheral module is connected to the same power source as the servo amplifier, the noises emitted
from the servo amplifier may be transferred by way of the power lines to cause malfunction of the peripheral
⑦ module. In such a case, you should provide such countermeasures as listed below:
1. Provide a radio noise filter on the drive line (input/output line) of the servo amplifier.
2. Provide a line noise filter on the drive line of the servo amplifier.
If a closed loop is formed with the ground wires from a peripheral module and the servo amplifier, electric
⑧ leak may, by way of the closed loop, cause malfunction of the peripheral module. In such a case, you may
try removing the grounding wire of the peripheral module, which may cease the malfunction.
⑤
⑦
②
①
サーボ
アンプ
amplifier
受信機
Receiver
③
サーボモータ Servomotor
Countermeasures
６-７
6 － 4
⑦ ⑦
センサ電源
Servo
②
⑥
④
③
M
Sensor power
⑧
センサ
Sensor