12.OPTIONS AND AUXILIARY EQUIPMENT
(b)Reduction techniques for external noises that cause the servo amplifier to malfunction
If there are noise sources (such as a magnetic contactor, an electromagnetic brake, and many relays which make a large amount of noise) near the servo amplifier and the servo amplifier may malfunction, the following countermeasures are required.
Provide surge absorbers on the noise sources to suppress noises. Attach data line filters to the signal cables.
Ground the shields of the encoder connecting cable and the control signal cables with cable clamp fittings.
(c)Techniques for noises radiated by the servo amplifier that cause peripheral devices to malfunction Noises produced by the servo amplifier are classified into those radiated from the cables connected to the servo amplifier and its main circuits (input and output circuits), those induced electromagnetically or statically by the signal cables of the peripheral devices located near the main circuit cables, and those transmitted through the power supply cables.
Noises produced by servo amplifier
Noises transmitted in the air
Magnetic induction noise
Static induction noise
Noises transmitted through electric channels
Noise radiated directly from servo amplifier
Noise radiated from the power supply cable
Noise radiated from servo motor cable
Routes 4) and 5)
Route 6)
Noise transmitted through power supply cable
Noise sneaking from grounding cable due to leakage current
Route 1)
Route 2)
Route 3)
Route 7)
Route 8)
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| 7) | 7) |
| 7) | 2) |
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| power |
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| Servo | supply | |
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| amplifier | |
Instrument |
| Receiver |
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| 4) | Sensor |
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| Servo motor | SM | 3) |
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| 12 - 28 |
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