ELTRA encoder fault detection method

The fault detection method of ELTRA encoder:

ELTRA encoder detection is an important part of the CNC machine tool servo system. ELTRA encoders play a role in detecting the displacement and speed of each control axis. It feeds back the detected signals to form a closed loop system. Measurement methods can be divided into direct measurement and indirect measurement: direct measurement is to measure the linear displacement of the machine tool with linear detection elements. Common detection elements for direct measurement generally include: linear induction synchronizer, metrology grating, magnetic scale laser interferometer. Indirect measurement is the measurement of the linear displacement of the machine tool using rotary detection elements. Commonly used detection elements for indirect measurement generally include: pulse encoders, resolvers, circular induction synchronizers, circular gratings and circular magnetic grids.

The ELTRA encoder can realize the electronic subdivision and direction discrimination function by placing 4 photoelectric devices at a certain interval within a moiré fringe width. For example, a grating ruler with a grating line of 50 line pairs/mm has a grating pitch of 0.02mm. If four subdivisions are used, a count pulse with a resolution of 5μm can be obtained, which has reached a high level in general industrial measurement Accuracy. Since the displacement is a vector, it is necessary to detect its magnitude and its direction, so at least two photoelectric signals with different phases are required. In order to eliminate common mode interference, DC components and even harmonics, a differential amplifier composed of a low-drift operational amplifier is usually used. The 4 photoelectric signals obtained by the 4 photosensitive devices are respectively sent to the input terminals of 2 differential amplifiers. The phase difference of the two signals output from the differential amplifier is π/2. In order to obtain the direction and count pulses, the two channels need The signal is reshaped, and they are first reshaped into a square wave with a duty ratio of 1:1. Then, by comparing the phase of the square wave, you can get the moving direction of the grating ruler. By counting the square wave pulses, the displacement and speed of the grating ruler can be obtained. ELTRA encoder fault detection method

Before we use the Iltron encoder, we must do a thorough inspection of it, so as to ensure the work is going on, be sure to love it, and are there any things to pay attention to when using the Iltron encoder? Here are a few issues to pay attention to.

1. Purchase the right type of Ertron encoder and prohibit the Ertron encoder from working in the inefficient area.

2. We must be more careful when doing a comprehensive physical examination of the Iltron encoder, and the focus should be on the vulnerable and wearable parts, and make a record of the specific use time and work status of these parts. Description of the situation, and to ensure that there are enough spare parts in the inventory for emergency needs, and the business philosophy of reducing time and production costs should always be implemented in the mind of every employee.

3. The lubrication system of Iltron's encoder equipment is also an object worthy of attention. It is very important to be clean and tidy when filling the oil. Many detailed problems will directly affect the process effect of the equipment. Use a filter to refuel, remove the stolen goods and some It is also a trick to prolong the use time of the equipment to ensure the quality and quality of the oil which is of no value. Don’t seal the oil cap when the Ertron encoder equipment is in normal operation, so as to prevent debris from entering. The details.

The above is the need to pay attention to using Iltron encoder, so we should pay attention to these details when using it.

The classification of Iltron encoders introduces common faults 1. Encoder fault: it means that the encoder itself cannot generate and output the correct waveform due to the fault of its components. In this case, you need to replace the encoder or repair its internal components.

2. Encoder connection cable failure: This type of failure has the highest probability of occurrence. It is often encountered during maintenance and should be the priority factor. Usually the encoder cable is open, short-circuited or poorly contacted. At this time, the cable or connector needs to be replaced. Special attention should also be paid to whether the cable is not tightly fixed, causing the loosening to cause open welding or disconnection. At this time, the cable needs to be clamped.

3. Encoder +5V power supply drop: It means that the +5V power supply is too low, usually not lower than 4.75V. The reason for the too low is the power supply failure or the large resistance of the power transmission cable, which causes loss. At this time, the power supply needs to be repaired. Or replace the cable.

4. Type encoder battery voltage drop: This kind of fault usually has a clear alarm. At this time, the battery needs to be replaced. If the memory of the reference point position is lost, the operation of returning to the reference point must be performed.

5. The shielded wire of the encoder cable is not connected or falls off: This will introduce interference signals, make the waveform unstable, and affect the accuracy of communication. It is necessary to ensure that the shielded wire is reliably welded and grounded.

6. Loose encoder installation: This kind of failure will affect the accuracy of position control, resulting in excessive position deviation during stopping and moving, and even servo system overload alarms will be generated as soon as the machine is turned on. Please pay special attention.

7. Grating pollution This will reduce the signal output amplitude, so the grease must be gently wiped off with absorbent cotton dipped in absolute alcohol. Italy's ELTRA value-added encoders are sold in China, welcome new and old customers to our company, the original imported price is favorable!