Today I will tell you clearly what this alarm represents, what are the common causes, usually how to step-by-step troubleshooting, and how to avoid future encounters.
438 Alarm in the End What Is It?
Simply put, the 438 alarm is the servo drive or motor current abnormality. Fanuc system will generally prompt:
> "Alarm 438: Overcurrent in Motor”.
This is a protection function. It stops as soon as it realizes that the current is not right, preventing the servo drive module, power unit or motor from continuing to be injured.
Don't underestimate this alarm, running it hard can blow up the module or burn out the motor.
A Few Common Reasons
In the field, 438 alarms appear in the scene is actually quite a lot, I summarize the common is these categories:
* Motor overload
The knife ate too hard, the cutting parameters are not adjusted, the motor can not carry.
* Circuit short circuit or leakage
Motor winding problem, cable aging, or insulation broken, the current directly hit the ground.
* Drive module failure
Fanuc drive in the head of the IGBT or power unit burned, very common.
* Poor heat dissipation
Fan is bad or the air duct is blocked with dust, resulting in overheating.
* Servo parameters are not correct
Current limit, gain parameters are set wrong, so that the motor overload.
* Mechanical stall
Screw stuck, bad bearings, guide rail jammed, the motor desperately push, the current naturally soared high.
Steps for On-Site Troubleshooting
A lot of people ask, "What should I do first once the 438 comes out?” This is how it usually works.
1. first look at the load
Reduce the cutting volume a little, slow down the feeding speed, or directly disconnect the motor load, see if the alarm disappears.
2. Check the motor and cable
With a multimeter to measure whether there is a short circuit, leakage. The outer skin of the cable is not worn out, burned black places, hand to touch again.
3. Check the driver module
Remove the driver and smell, there is no burning smell; look at the capacitors, circuit boards are not fried. If the IGBT is burned, it can only be repaired or replaced.
4. Look at the cooling system
Is the fan spinning? Is the air duct full of dust? If the heat dissipation is not good, the current will soar. Bad fans must be replaced.
5. Check the servo parameters
Sometimes it is human error to set the current limit too low or the gain too aggressive, it is easy to report 438.
6. Confirm the condition of the parts
If you find that the driver or motor is really bad, then don't delay, and quickly find a professional supplier, such as Songwei, to do testing or replacement.
How to Avoid 438 Alarm?
To be frank, most of the alarms are caused by the failure of "maintenance”. Generally, it is recommended that customers:
* Cabinet to maintain ventilation, do not let the machine run in the tank.
* Regular ash, the cabinet piled up a layer of powder, heat dissipation immediately discounted.
* Parameters should be set right, do not blindly accelerate, chaotic servo adjustment.
* Cable, grounding wire should be regularly inspected.
* Do not be too aggressive with the knife path, even if the machine is good, it can't carry a long-term overload.
How Can Songwei Help?
If you really encounter Fanuc servo alarm 438, and you can't find the result by yourself, or you have already confirmed that it's a module or motor problem, then you have to find a professional team.
We Songwei usually mainly do industrial automation spare parts and repair, specifically can help you:
* Provide new, used Fanuc drives, motors and modules with global shipment.
* Do professional testing and repair, especially Fanuc drives and circuit boards.
* There is a complete
Fanuc test bench, can help you verify in advance, to avoid changing up and still reporting errors.
* There is also a technical team that can remotely guide the troubleshooting, to help you shorten the downtime.
* In addition to Fanuc, we also engage in Mitsubishi, Siemens, Okuma, Heidenhain parts.
Summary
Fanuc alarm 438, to put it bluntly, is the current overload protection, common causes include: motor overload, short circuit or leakage, drive module failure, poor heat dissipation, parameter setting error, mechanical jamming.
Field troubleshooting I suggest the order is: first look at the load, and then check the motor cable, then check the drive, heat dissipation and parameters, and finally confirm the parts. Really can not be solved, it should be sent for repair or direct replacement.
Remember: don't just clear the alarms, the key is to find the root cause, otherwise repeated errors will only hurt the machine more and more.
If you are stuck with Fanuc servo alarm 438 right now, you can contact
Songwei directly, we can help you repair, replace, test, and make sure the machine is back in production as soon as possible.
