When you encounter 368 alarms, don't just replace the parts. According to the following order to touch once, can save a lot of money and time.
Step 1: First ask the "crime scene”
Alarm screen will show which axis (X, Y, Z or spindle). Immediately think back: the alarm suddenly appeared when the machine is moving at high speed, or slow processing? Or was the alarm simply raised as soon as the machine was powered up? This detail is very important. If it is occasional in motion, most likely cable or interference; if the power on, then the encoder or drive itself is a big suspect.
Step 2: Keep an eye on the "non-wire” - encoder cable
This is the most common and the best place to check. After the power off, open the motor back cover, find the thin cable connected to the encoder. Focus on it:
1. Connector: pull it off and look inside to see if the pins are bent, rusted or oiled. Many times the plug is loose or coolant has seeped in and caused a short circuit.
2. The cable itself: touch it from end to end, there is no drag chain flattened, cut by iron filings, or bent into a dead bend. Especially the shaft is often moved back and forth, the cable is likely to have been broken inside the seven or eight copper wires, sometimes through sometimes not.
There is a native way: if the other axis with the same cable, you can try to adjust it. If the alarm followed by the cable to run to another axis, it is certain that the cable.
Step 3: Check the "reporter” himself - the encoder
If the cable is not a problem, then we have to suspect the encoder itself. This thing in the motor tail, harsh environment, long-term vibration, heat, inside the grating or magnetic grid may be aging, the signal itself is unstable.
How to make a preliminary judgment? You can listen to the motor running any abnormal vibration, or look at the processing size there is no regular small deviation. Of course, the most accurate or with a professional encoder tester on the machine to measure the signal waveform.
Step 4: Look at the "receiver” there is no problem - servo amplifier
If the previous are ruled out, the problem may be in the "receiver”, that is, the servo drive. It has an internal circuit module responsible for decoding encoder signals, if the module fails, and then good, stable signals transmitted to it can not be recognized.
In this case, it is usually necessary to dismantle the drive and send it to a place with a professional test bench for testing. Our test bench can simulate the entire communication link and pinpoint which link of the drive is "deaf”.
Step 5: Do not forget the "environmental noise” - electrical interference
High-power equipment in factories, such as welding machines, inverters work, is simply a "noise maker”. If your encoder cable shielding layer is not good, or bundled with the power line together, these interference noise will "run” into the weak data signals, the communication made a mess.
Check to see if the cable shield is properly grounded, and try to route the encoder cable separately, away from the power cable.
