Encoder failure detection and use the matters needing attention
Encoder is a kind of electronic components, which are frequently used because of the frequent use of reason, can appear some fault, and the encoder failure easily expressed in the whole machine, for example: turn the large noise, sound when the small, the power switch failure and so on.
Encoder detection method, today to tell you about encoder failure treatment method, the encoder to use notice these problems.
Encoder test method of 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.
Encoder failure treatment method 1.
In usually use multimeter for detecting encoder fixed pin end on both sides, if measured the resistance value of the encoder and the nominal value deviation is too large, which is likely to be the pin end of the encoder is internal short circuit fault, etc.
So for dealing with this kind of failure, small make up recommend generally opt to replace encoder.
General repair inconvenience, because this kind of pin internal short circuit faults are due to some components have been damaged, even if repaired, on the use of resistance will be serious burn out due to flow.
About general encoder fault has often happened in regulating that you make larger rotation noise, its main reason is that in resistance due to wear and make this little contact with poor contact between the resistor body, which can lead to large and small resistance value, cause in regulating can produce noise.
To deal with the noise of encoder failure methods, first can come unwrapped encoder, then add points on the axis of the encoder industrial lubricating oil, its purpose is to can reduce friction when adjusting the axis of rotation and at the same time to reduce the resistance to wear, and on the use of encoder can eliminate noise fault like this.
The encoder fault of rotors of large noise, pin internal circuit, wear resistance, burn, switch damage, etc.
4 big rotating noise 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 volume doesn't close the phenomenon of death, 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.
The encoder to use note 1.
Before the encoder used, must be carefully check the stand or fall of encoder, for example, the encoder leading-out terminal exists between each pin loosening, and its contacts are in good condition and reliable.
Or for a failure of the encoder used, not only affects the normal work of the equipment circuit, but they may also cause damage to other components in the circuit.
When the encoder is installed into the circuit, to pay more attention to the encoder three pin connections are correct, if there is wrong, in the use of encoder is likely to lead to failure or some volume is the volume of fault is closed tightly.
About in addition to the rotary encoder switch, at present in the market also distinguish between a push-pull type switch, encoders, then choose for these two kinds of different specifications of the encoder on, we should distinguish to use.
Such as the maximum voltage on the encoder, the maximum current of each arm can provide, can allow the maximum power consumption as well as the need to consider the resistance of the problem.
From the aspects of power to the noise.
Error usually have + / - of a single resistor
To + / - 20%
5%, the temperature can cause resistance drift, so need to consider the precision of the encoder, linear, monotonicity or not, whether to consider other factors in the design.
Such as the human ear to the voice of frequency response should be more important.
And add the change of electrical resistance when power disconnected, the cost and volume, and reliability such as assembly, humidity, etc.
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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