702 DC motor overheat

[Rocksalt]

Is this alarm 702 related to the axis drives? It does not give a particular axis in the alarm. I am getting an intermittant 702. I felt the axis drive motors and they are not hot. Seems the wire is loose or almost broken. Just wanted to know if this is on the Fanuc side or could possibly be the thermal in the spindle motor. The spindle drive is a Fuji and when spindle alarms occur has a separate alarm light related to "spindle trouble". This is a 6TB control.

Thanks

[Rocksalt]

Bump!?!

[Arrow Control]

702 is overheat of servo motors. If motors are not hot then look for a bad temp sensor in motors. Are the motors yellow or black cap?
If yellow cap check pins R & S on amphenol connector on motor should be 0 ohms. If black cap check OTL1 & OTL2 on terminal strip in motor. If not there check cables. All wires go back to feedback connectors on bottom of motherboard.

[Rocksalt]

Thanks arr5ow. Had to jump it out until December when I get a chance to run new wires. My gut said it was on the Fanuc side since I don't ever get alarms generated from the spindle on the screen. Broken wire somewhere(almost broke anyway).

[Arrow Control]

702 will not come from spindle , only servos

[Dan Fritz]

Sometimes Fanuc puts an overheat sensor in the servo transformer also. This sensor is usually in series with the sensors in the motors, so you can't tell whether the open sensor is in a motor or the transformer. A bad wire, loose connection, or bad sensor can cause this problem.

[Rocksalt]

Originally Posted by Dan Fritz Sometimes Fanuc puts an overheat sensor in the servo transformer also. This sensor is usually in series with the sensors in the motors, so you can't tell whether the open sensor is in a motor or the transformer. A bad wire, loose connection, or bad sensor can cause this problem.

This brings back memroies I thought I had forgotten until you mentioned it!