Need help in clearing 430 X-AXIS: SV. MOTOR OVERHEAT alarm in Fanuc.

[Sanju117]

Hi,

My CNC milling machine is equipped with a Fanuc Oi-mate MC controller. An error 436 X-AXIS: SOFTTHERMAL (OVC) occurred, causing the X-axis motor to stop. When this occurred, I took the motor out, examined the power cable and encoder, put them back together, and turned them on. Following the emergency release, there was a jitter in the motor, and an alarm with the code 410 SERVO ALARM: X-AXIS EXCESS ERROR was heard. I managed to turn off the alarm. Next, a 300 APC alarm went off, stating that ZRN was needed for the X-axis. I set the 1815 parameter to APC "1" and APZ "1," eliminating this alarm. After that came the 430 X-AXIS: SV. MOTOR OVERHEAT. The overheating warning came on even though the motor was not even hot. I need assistance debugging and resolving this problem. Is there anyone who can assist? Could you please tell me the cause of this problem?

 

[DouglasJRizzo]

It may not be the motor, but the drive itself.
Check for blown fuses/popped breakers.

 

[Vancbiker]

Hard to say what caused the jitter based on your information so far. When you say you examined the motor and encoder can you describe what you did? Was the encoder removed?

The overheat signal is carried in the encoder cable. With that alarm and a cold motor, a bad connection is the likely cause. Especially when you add the encoder alarm. Bad connection could be the connector or bad cable.

 

[Sanju117]

It may not be the motor, but the drive itself.
Check for blown fuses/popped breakers.

Noted, I will give them a look.

 

[Sanju117]

Hard to say what caused the jitter based on your information so far. When you say you examined the motor and encoder can you describe what you did? Was the encoder removed?

The overheat signal is carried in the encoder cable. With that alarm and a cold motor, a bad connection is the likely cause. Especially when you add the encoder alarm. Bad connection could be the connector or bad cable.

I have included a picture. Just to demonstrate what I did, I used this old motor. Accordingly, I mentioned that the 410 SERVO ALARM: X-AXIS EXCESS ERROR appeared on the machine. This means that upon turning on the machine and disengaging the emergency, the motor will tremble once before the 410 alarm appears. Just like when I first opened the motor, I put the part into the slot precisely. Following that, the EXCESS ERROR was not displayed when I turned on the machine. The machine initially displayed a 436 X-AXIS SOFTTHERMAL ERROR. The motor's power socket was severely damaged. I made a change. Afterwards, the 463 is not displayed.

 

[Vancbiker]

Are you sure that the encoder is not 180 degrees out of alignment? Notice there is an orientation mark (triangular indent) on the coupler.

 

[Sanju117]

I have included pictures of the coupler. I am hoping you can see the triangle. Can the problem be identified by switching the X and Y-axis power cables?

 

[Ox]

The two yellow wires shown in your pic that are cut - those should be throwing your OVERTEMP alarm.
You should be able to tie them together to bypass the thermister (?) to check.


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I am Ox and I approve this here post!

 

[Sanju117]

View attachment 446859

The two yellow wires shown in your pic that are cut - those should be throwing your OVERTEMP alarm.
You should be able to tie them together to bypass the thermister (?) to check.


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I am Ox and I approve this here post!

Hey Ox, I just took this image from a motor that's not being used for reference. The one in use is indicated in the image above.

 

[Sanju117]

Hi, When I checked the Servo Motor Temperature parameter (308) recently, the X-Axis indicated 4 degrees. The Z and Y axes, however, displayed 42 and 44, respectively.