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A common faults and selection considerations of the encoder

by:HENGXIANG     2020-12-04
Encoder is converting signals or data preparation, available in the form of communication, signal transmission and storage of equipment. The encoder angular displacement or linear displacement is converted into electrical signals. Fault fault phenomena: 1, the encoder itself: refers to the encoder itself components failure, it does not produce and output waveform right. This case need to replace encoder or the internal devices maintenance. 2, the encoder connection cable fault: the highest rates of failure occurs, often encountered in maintenance, should be a priority consideration. Usually the encoder cable open circuit and short circuit or poor contact, the need to change cable or connector. Also should pay special attention to whether it is due to cable fixed tightly, not caused by loose open welding or open circuit, then lock cable. 3, encoder + 5 v power down: refers to the + 5 v power supply is too low, usually cannot be less than 4. 75 v, is the cause of low power supply failure or power transmission cable resistance caused by the big loss, then need to repair the power supply or replace the cable. 4, absolute encoder battery voltage drop: this kind of failure usually have clear alarm, and then need to replace the battery, if the reference point position memory loss, still must perform to return to the reference point operations. 5 don't answer, encoder cable shielding wire or fall off, it will introduce the jamming signal, the waveform is not stable, affect the accuracy of the communication, must ensure that the shielding wire reliable welding and grounded. 6, loose encoder installation: this kind of failure will affect the position control accuracy, stop and moving position deviation value super bad, or even just a boot servo system overload alarm is generated, please pay special attention to. Selection considerations: 1, machinery installation size: including positioning check mouth, trunnion, mounting holes; Cable wire way; Installation space volume; Work environment protection grade whether meet the requirements. 2, resolution: each lap of the output pulse encoder work, using precision whether meet the design requirements. 3, electrical interface: the encoder output way has a push-pull output (common F type HTL format) The output voltage, ( E) , open collector ( C, C for common NPN output, C2 for PNP tube output) Long-term drive output. Its means of output should match the interface circuit of the control system. Recommended reading: article / 88/131 / electrician / 2018/20180802721427. 超文本标记语言
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