Frage HF500 starts for no reason

Dear all,

Tonight I've experienced on several (4) occasions that my HF500 spindle has started spinning without me sending a command to start it. In fact, I've been sitting at my computer and the spindle starts all the sudden. It appears like UCCNC is involved somehow because I've kept it open on the control computer and the read back on output 1 shows that the spindle is enabled.

Right now I don't know whether to blame software (UCCNC), my controller hardware (UC400ETH) or the spindle controller.

Has anybody experienced something similar and found root cause?

This makes me scared of changing tools with the controller powered up.

Cheers, Per

Your multimeter is your friend helping you figuring out if there is really a signal which turns it on or if it is a problem with the spindle electronics.

Thanks Karoly,

I've been giving it some thought and since the visual feedback is present in UCCNC for output 1 under Diagnostics it seems to me like the problem must be in either in UCCNC or UC400ETH. I can't see how a hardware problem with the HF500 can cause an output of the UC400ETH to switch state. I've therefore asked cncdrive.com for help troubleshooting this.

Cheers, Per

Hi,

This will be of little help to you, but my HF350 operates as expected under UCCNC V1.2 and UC100 so I doubt if it is a UCCNC problem.

Peter

After working with the UCCCNC crew it turns out that this problem may be caused by a user written plug-in (auto-leveler) that was distributed together with the latest version. It also caused jogging to stop working when I loaded a NC-file. When the plug-in was disabled, it started working again, but their recommendation was to remove the plug-in completely to see that the spindle issue does not appear again.

/Per

Hello.

Strange behavour.

I have a different problem.
When i run a drill-file generated by pcb2gcode, it often won't spin upp after a tool swap.
It looks like the HF500 controller box resets, and the spindle plays the startup sound, and i have to stop the script so the tool don't crash into the part.

Is this a normal problem?

/Terje.

Hi,

I had the very same problem with my HF350. After spending a lot of time researching the problem, it came down to an occasional overcurrent situation when the commutation tried unsuccessfully to synchronise to motor rotation. This drives the power supply to its overcurrent limit and severely compromises the start up.

I changed some parameters in the motor start up sequence at the motor manufacturers recommendation, and whilst this did improve matters somewhat there are still occasions when the ESD button has to be used.

Rory has the low down on this - we had many discussions on the subject a few months back.

Peter

I have another problem which is related to the HF spindle drive, probably finger trouble!

I cannot get the spindle to run faster than 45%. Setting it manually I can run to 99%, I have set the maximum speed in the parameters to 20000 and have also set the tool speed to 20000, setting S20000 in the gcode program, but still get 45% speed.

Any suggestions would be welcome, thanks in advance

Fred wilkinson

Check whether the speed is limited by your control software.