Different models of
FANUC controller, such as 0i, 30i, 31i, 32i series, the definition of alarm 7 may be slightly different. But the common situations are basically focused on these types:
- Servo motor overheating: the motor temperature exceeds the limit, the system in order to protect it stopped.
- Driver internal error: such as too much current, unstable power supply and other problems.
- Feedback signal abnormality: the encoder signal is lost or wrong, the drive can not recognize the position of the motor.
Here are a few common inspection methods used by the first line, which are more practical:
First Start from the Equipment Body
- Touch the motor: use the temperature gun to see the motor shell temperature, overheating, then basically find the reason.
- Manually turn the motor shaft: Is there any jamming? If it is tight, it may be mechanically stuck.
- Check the cables and plugs: loose, poor contact, oxidation and these small problems are also often out of the pot.
Then Check the Drive
- Go to the system to see the alarm details, FANUC's diagnostic interface is usually recorded.
- FANUC's Servo Guide software, look at the real-time current, voltage and feedback signals are not abnormal.
- If possible, change a spare part to try. Alarm disappears after changing the drive or motor, indicating that the original hardware is indeed a problem.
Don't Forget to Check the Power Supply
- Use a multimeter to measure the input voltage to see if there is too much fluctuation.
- The power supply filter should also be looked at, sometimes too much interference with the power grid can also be a problem.
Check the Mechanical
- Poorly lubricated bearings, screws and guide rails may increase the load on the motor.
- Some machine assembly precision is not adjusted properly, the motor operation is also easy to bias load.
How to Avoid Alarm 7 in the Future?
- Regular inspection: do not always ignore the motor temperature, it is always right to check once a month; drive fans, heat sinks, internal components, the best quarterly sweep.
- Stable power supply: install a voltage regulator can save a lot of things, especially when the workshop voltage fluctuations.
- Mechanical maintenance do not be lazy: guide rail lubrication, bearing oiling, chip removal smooth, these small actions to do diligently, the machine operation is easy.
- Monitoring data at any time: with FANUC comes with diagnostic functions, current, voltage, temperature at any time to keep an eye on, there are abnormalities early detection.
