The reasons for the encoder failure may be these!

Encoder is a kind of precision electronic components, which is widely used in various fields. It can be used to measure speed, angle, distance and displacement. During our use, sometimes the encoder will have some malfunctions. Now Shengwei Electronics summarizes The reasons and solutions for some encoder failures are provided for your reference!

After on-site investigation, it was determined that the cause of the encoder failure of the third-stage ship loader was caused by Devicenet communication interference and improper configuration; many of the DeviceNet system abnormalities that need to be repaired are Bus Off, and this information is displayed in the DNB as the scanner device. And the red lights of the devices on the network are on. This is because each device has an error accumulation counter, this counter accumulates CAN network errors, and when the information is sent intact, it will reduce the error accumulation number. If the error counter increases quickly in a short time, the device will consider it The network is unstable and shuts itself down. Due to this transmission, good equipment shuts down.

The usual reasons for Bus Off are:

The baud rate of the device is incorrect.

Junk data packets from defective devices.

A device with a problem at power-up or power-off causes a CAN error.

The terminal resistance is too large or too small.

The power supply rise time is too slow.

The network cable is close to the high-voltage line.

1. Encoder fault: it refers to the fault of the encoder's own components, which causes it to fail to generate and output the correct waveform. 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 loosening and causing open welding or disconnection. At this time, the cable needs to be clamped.

3. Encoder +5V power supply drop: refers to the +5V power supply is too low, usually not lower than 4.75V, the cause of the too low is the power supply failure or the power transmission cable resistance is too large and the loss is caused, then the power supply needs to be repaired Or replace the cable.

4. Absolute encoder battery voltage drops: This type 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 shielding wire of the encoder cable is not connected or falling off: This will introduce interference signals, make the waveform unstable, and affect the accuracy of communication. It is necessary to ensure the reliable welding and grounding of the shielding wire.

6. Loose encoder installation: This kind of failure will affect the accuracy of position control, resulting in excessive position deviation during stop and movement, and even an overload alarm of the servo system 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.