Rotary encoder is used widely, the cases of electronic magnetoelectric rotary encoder is widely used in robot, automatic production lines, automatic assembly machine, elevator, textile machinery, sewing machinery, packaging and printing machinery, CNC machine tools, mapper and Angle measuring instrument, etc.
Rotary encoder type specifications distinguishing between incremental rotary encoder, absolute rotary encoder.
And one of the most commonly used is the incremental rotary encoder, today to tell everyone about the working principle of incremental rotary encoder, incremental rotary encoder wiring method, incremental rotary encoder installation steps, incremental rotary encoder using considerations, let everybody know more about the incremental encoder.
Working principle of the incremental rotary encoder incremental rotary encoder has no fixed starting zero, the output is pulse is proportional to the Angle increment, counter has to be used to gauge the pulse number.
Every turn a pervious to light zone, gives a pulse signal, then using the PLC high-speed counter to count the pulse signal, in order to obtain measurements.
Incremental rotary encoder wiring methods generally 5 lead, incremental rotary encoder is 1 COM back line, the other one is the power cord, and the rest of the three is pulse output line.
First of all, the power -
End to the encoder COM end connection, then the + end connected to the power supply end of the encoder.
At this time of the encoder COM end connected to the PLC input COM port, A, B and Z two-phase pulse output line is directly connected with the input end of the PLC, A and B to differ 90 degree pulse.
Finally, incremental rotary encoder and a shielding line, when use the shielded wire grounding, can improve the anti-interference ability.
Pay attention to the point: when the work voltage and PLC as the input voltage is not at the same time, it should be noted is that external power supply voltage must be under DC30V, more than the working voltage, the encoder internal damage may occur.
Incremental rotary encoder installation step 1.
Firmly encoder, in order to avoid loosening due to vibration in the process of use.
Encoder wiring, please make sure the load should not exceed the maximum allowable values and deviation.
Lock the screw of the encoder coupling surrounding, in order to avoid loose in use process.
Incremental rotary encoder using note 1.
Add in the vibration on the rotary encoder, can become false pulse.
Therefore, to set the place, the installation place.
When the more the number of pulses per revolution happened, then rotate the narrower slots of the disk slot interval, the more susceptible to the effect of vibration.
When low speed rotation or stop, add in the encoder shaft or vibration disc jitter spin groove on the body, may occur at any time pulse by mistake.
Wiring shall be carried out under the power OFF state, when power on, if the power supply output line contact, have it might damage the encoder output circuit.
When the encoder wiring should take note the polarity of the power supply, etc. , if the wiring error, is likely to damage the encoder internal circuits.
In order to avoid the encoder sensor noise, etc. , to use the shortest distance wiring.
To the integrated circuit input, especially need to pay attention to this point.
Spinning the incremental rotary encoder output pulse, through counting device to know its position, when the rotary encoder or power failure, rely on counting device's internal memory to remember the location.
After the power outage, there cannot be any mobile rotary encoder;
When the electricity work, rotary encoder output pulse process, also can't be a pulse interference and loss, otherwise, will offset zero point counting device memory.
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