Servo motor maintenance
Model: MHMD servo motor
Failure phenomenon: customers get the servo power display encoder fault, the replacement of the same model of the servo motor operating normally.
Fault analysis: encoder fault classification
(1) the failure of the encoder itself: it refers to the failure of the encoder itself, which causes the failure to establish and output the accurate waveform. In this case the need to change or repair the internal parts of the encoder.
(2) encoder connection cable fault: the fault have the highest rate of repair were often, should be the priority factors to consider. Usually for the encoder cable open circuit, short circuit or poor communication, then need to change the cable or connector. Also should be particularly careful whether it is due to the stability of the cable is not tight, loose trigger open welding or open circuit, then need to tighten the cable.
(3) encoder +5V power fell: refers to the +5V power supply is too low, usually not less than 4.75V, which is the low grounds power supply failure or power transmission cable resistance caused by the partial cost, then need to repair or change the power cable.
(4) absolute encoder battery voltage drop: this failure usually has a meaning to understand the alarm, then need to change the battery, if see point memory loss, but also to implement a return to participate in the operation.
(5) encoder cable barrier line or off: it will introduce no disturb signal, the waveform is not fixed, and the correctness of communication, welding and grounding will ensure reliable barrier line.
(6) encoder assembly loose: this fault will affect the accuracy of the seat restraint, constitute a pause and slide in the amount of error in the amount of error, or even just a boot that is to establish a servo system overload alarm, please be careful.
(7) grating pollution, this will cause the signal output to drop, be sure to use absorbent cotton dipped in alcohol and gently wipe the oil
Fault repair: according to the above problems one by one check to find the servo motor encoder encoder power +5V normal, when using the oscilloscope measurement found that the pulse output waveform is not, according to the experience can judge A/D conversion IC bad. Replace IC after test is normal. Fault release.
Hong Jia Wei Panasonic servo motor maintenance, including maintenance: servo motor can not start, start running, to jitter, loss of excitation, over-current, overload, Paowei, output imbalance, encoder alarm, encoder and damage location not a power on a power trip alarm magnetic iron steel explosion death card won‘t turn the encoder motor wear heat hot repair and maintenance of abnormal motor operation. Hong Jia Wei can repair the German SIEMENS SIEMENS, LG, ABB, Danfoss, Danfoss, Lenze Lenz, SANKEN Schneider Schneider, Sanken, SEW KEB, Kobe Emerson, Emerson HOLIP, Hitachi OMRON, OMRON, Fuji, MITSUBISHI, Yaskawa, European EUROTHERM, CT and other brands, currently has a professional maintenance engineers and advanced maintenance equipment. With maintenance technology and experienced.
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