Drive Fault / Spindle overload

[DF-ENTERPRISES]

Hi everybody. I have been having some problems. When I start my spindle running about 1500-2000 rpms the spindle starts good. When I try to start it with 2500 plus RPM's I get a drive fault or spinlde overload error. I can start it at 2000 RPMs and bump it up to 3000 or higher with no problem.

Any comments will be helpful.

Thanks

DF

[machintek]

Current draw vs time to get to speed and the current drops is too great.
Do you have true 3 phase power?
Are you on a phase converter? Static or rotary?
What is the spindle motor overload set to?
Is the spindle motor wired for the correct incoming voltage?

George

[DF-ENTERPRISES]

I am running a American Rotary 5hp phase converter. I tried adjusting the spindle overload from the lowest to the highest setting but that didn't help. Originally I had a Bridegport tech wire the machine for 230 volts. Is there a way I can check an area with a voltmeter at startup to see if the voltage is dropping to low? I'm beginning to think a phase converter is not a reliable way to power this machine.

Thanks George.

[machintek]

If you measure each leg with respect to ground with a voltmeter, probably the artificial leg goes way low when you start up the spindle.
There are a lot of posts about this.

George