Over Voltage Alarm

[Neil101]

Hi guys,

Any idea what is causing this alarm?

I’m running a HAAS lathe.

 

[Booze Daily]

My Okuma lathe does that sometimes. Don’t know why.
Turn it off and back on has always fixed it.

 

[Neil101]

My Okuma lathe does that sometimes. Don’t know why.
Turn it off and back on has always fixed it.

Okay, appreciate it.

 

[mmurray70]

Hi guys,

Any idea what is causing this alarm?

I’m running a HAAS lathe.

Most likely sometime wrong with the Braking resistor up on top of the machine, or the electronics that control it. When spindle stops it dumps power to that resistor. If it cant get rid of the power bus voltage gets too high.

If its just an occasional thing might want to adjust deceleration parameters on the machine. Could happen from the stock settings being too much for a heavy workpiece.

 

[Vancbiker]

If the drive regenerates power to the line for braking rather than a resistor, it could be caused by undersized wiring. Had a customer wire a Mori lathe in a spot that used to be a smaller mill. He used the same wire that had powered the mill and just installed a larger breaker in the panel. When stopping the spindle from high RPM it would often get a high DC bus voltage alarm. He’s lucky that using the undersized wiring did not start a fire. When making parts the conduit would often be very warm to touch. Rewiring the circuit eliminated the alarm occurrences.

 

[Neil101]

Most likely sometime wrong with the Braking resistor up on top of the machine, or the electronics that control it. When spindle stops it dumps power to that resistor. If it cant get rid of the power bus voltage gets too high.

If its just an occasional thing might want to adjust deceleration parameters on the machine. Could happen from the stock settings being too much for a heavy workpiece.

Thanks