Encoder is a common electronic components in the circuit, there might be an encoder on the long time operation under the condition of small fault, produced by the encoder failure are more likely to show it on the whole machine, such as gyration encoder when noise is very big, big sound when small and power switch failure, etc.
Detection method of the encoder.
Measure the encoder with appropriate ohm 1 ~ 3 of the total resistance, look to whether within the scope of the nominal value.
Pens and pick up to 23 between terminal 1 a or 2, repeatedly varied slowly rotating encoder shaft, see if electric meter pointer changes continuously and evenly.
The resistance value should be near zero the continuous variation between nominal value.
Today to summarize the encoder to repair the four ways of friction is a cleaning method.
At first was not serious wear and tear of the encoder, shows problems in regulating noise or sound appear when the volume is big and small, images have some clutter, etc. , this is mainly due to the encoder in the process of using broke into the dust or contact spring under constant friction with carbon film produced dust and pollution the contact, the contact spring and carbon diaphragm poor contact.
For this kind of problem, I often use the method: first is sliding back and forth constantly or rotary encoder, such doing can remove the dirt from the contact with the carbon membrane, let contact become bright and clean, even not to clean can make equipment temporarily returned to normal, this is temporary solution can yet be regarded as a desirable way.
To make further solved problem, we can after friction of the encoder with cleaning fluid for cleaning, thoroughly wash out the dirt from the encoder carbon membrane, let reed good contact with the carbon membrane.
The second is replacing method.
Some heavily damaged encoder, clean with friction method won't solve the problem, such as reed and carbon diaphragm rupture occurs, contact the question I have is to use substitution method to solve.
First of all, the damage of the encoder removed from the equipment, then to split, it will be broken reed and carbon membrane with good to replace in previously used encoder combination again to go, but don't forget to wash before are combined, if the dirt on the reed contacts wash not to drop, we can also contact for grinding, thus ensure that the new composition of the encoder can function in the equipment.
Three is diverted reeds or self-control method.
Some encoder of the damage was due to contact grinding carbon carbon film on the diaphragm, lead to contact with carbon film caused by poor contact failure, then I will by adjusting the Angle of the reed, let the reed contacts and unworn parts on carbon membrane contact, to achieve the purpose of eliminating fault: open the encoder, visible reed with the original friction between sliding track, make carbon membrane surface orbit has the obvious scratch, cause poor reeds in contact with the carbon membrane.
After cleaning with pointed mouth tweezers will adjust reeds, from its original sliding track, reed good contact with no wear of carbon membrane.
Also some of the encoder of the damage was due to reed contacts in the ground, this kind of situation if there is no replacement, we can also use copper for homemade to solve it.
Fourth, lubrication protection law.
In order to prolong the service life of the encoder after the repair, I also often on the carbon membrane of encoder tu silicone (
Sewing machine oil can also)
, the advantage is to prevent to produce arc, as a result of the silicon grease lubrication reed and carbon membrane friction reduction, so that the encoder in the change of the resistance when tuning balanced and smooth, the effect is good.
The encoder common failures and repair: 1.
The encoder fault of rotors of large noise, pin internal circuit, wear resistance, burn, switch damage, etc.
Rotation noise is big main reason is that the encoder in resistance due to wear and make this little contact with poor contact between the resistor body, big and small resistance value, resulting in a cameroonian, Cameroon, multimeter according to the method for testing are available, and you will find Pointers have jump phenomena.
To have this kind of failure of the encoder, troubleshooting available cleaning method.
Use tweezers clip on dip in presence of water alcohol cotton ball, let the cotton ball close to the shaft, the alcohol resistance along the axis of injection, and the rotation of the rotor, until the noise disappear.
When the encoder pin internal circuit, can appear the phenomenon of the encoder doesn't work, that is when the rotating shaft current or voltage without any change in the circuit.
For the volume encoder, silent failure may occur, or the phenomenon of volume closed tightly, when using a multimeter test between two fixed pin or fixed pin with sliding contact resistance between the pins, its resistance to infinity, or close to infinity, the internal circuit can determine the pin.
Carbon film resistor body caused by flow will also serious burn out.
For open circuit or resistor inside the pin body burn out and open circuit of encoder, generally inconvenient repair, and adopt the method of replacement.
Has a long history of the emergence of the encoder, it used in a wide range of areas in various ways, as usual for adjusting and measuring field.
The most common way to set up and fine-tuning resistance to fine tuning circuit, set the level and adjust the gain, etc.
Encoders are also used to design a robot and position feedback in industrial equipment.
To switch the encoder needs to consider all aspects of the various requirements for a specific application.
Shanghai electronics is 27 years old coder manufacturer, specializing in the production of various types of encoder, the encoder model complete, can perfect to replace both at home and abroad brand encoders, can according to customer needs to customize the encoder resistance, linear, shaft type, axial length, size, etc.
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