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14. OPTIONS AND AUXILIARY EQUIPMENT
14.14 Noise reduction techniques
Noises are classified into external noises which enter the servo amplifier to cause it to malfunction and those
radiated by the servo amplifier to cause peripheral devices to malfunction. Since the servo amplifier is an
electronic device which handles small signals, the following general noise reduction techniques are required.
Also, the servo amplifier can be a source of noise as its outputs are chopped by high carrier frequencies. If
peripheral devices malfunction due to noises produced by the servo amplifier, noise suppression measures
must be taken. The measures will vary slightly with the routes of noise transmission.
(1) Noise reduction techniques
(a) General reduction techniques
Avoid laying the power lines of servo amplifier (input and output cables) and signal cables side by side
or do not bundle them together. Separate power lines from signal cables.
Use shielded, twisted pair cables for connection with the encoder and for control signal transmission,
and connect the shield to the SD terminal.
Ground the servo amplifier, servo motor, etc. together at one point (refer to section 4.12).
(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.
Although a surge absorber is built into the servo amplifier, to protect the servo amplifier and other
equipment against large exogenous noise and lightning surge, attaching a varistor to the power input
section of the equipment is recommended.
Summary of Contents for Melservo-J3 Series MR-J3-B
Page 19: ...10 MEMO ...
Page 55: ...1 36 1 FUNCTIONS AND CONFIGURATION MEMO ...
Page 61: ...2 6 2 INSTALLATION MEMO ...
Page 179: ...4 58 4 SIGNALS AND WIRING MEMO ...
Page 241: ...5 62 5 OPERATION MEMO ...
Page 357: ...10 16 10 SPECIAL ADJUSTMENT FUNCTIONS MEMO ...
Page 385: ...11 28 11 TROUBLESHOOTING MEMO ...
Page 397: ...12 12 12 OUTLINE DRAWINGS MEMO ...
Page 755: ...17 70 17 SPEED CONTROL OPERATION MEMO ...
Page 793: ...App 38 APPENDIX MEMO ...
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