Hurco BMC 30 AP

Today we went further and tried different things. In the meantime I bought a used converter.1. Replaced the broken transistor module on the old spindle driver, the error message UU is now present, but there is still no encoder signal on the Mesa card.2. Connected the "new" spindle driver dry, determined that the fan on the "old" spindle driver is broken, but also because the error message UU is present.3. Spindle driver „old“ exchanged for new spindle driver and the encoder signal can be properly evaluated via the Mesa card.Conclusion, spindle driver must have several defects, now it has to be clarified why the error UU occurs, possibly another problem with the wiring.

Today I compared both converters and started to check and measure component by component.
I noticed that there was a problem with the main switch on the "new" spindle driver.
If I switch it on, I can measure continuity under the individual phases at the output to the small transformer, which should mean that there is a short circuit.
The large fuse in the converter itself is ok.
We will continue to examine the converter over the next few days.

Hello,
we have found the error why the spindle driver always displayed undervoltage as an error. Since we don't have an inrush current limit yet, we always switched on the fuses one after the other. However, when you switched it on, you had a different voltage on the phases for a short time. The converter noted this condition and it was not possible to delete the error. If I switch on all 3 phases at the same time, no error appears and the spindle driver works.

The spindle is already turning, but there is another problem here. The voltage output (PWM) does not match the calculated setpoint. If I specify the speed for example, s750 in Linux CNC, 1.25V must be present at the output because the maximum speed is 6000 rpm. However, we have an output voltage of 2.5v on the mesa card. So there must be an error somewhere. Enclosed the hal and ini.

Then a Yaskawa CACr-SR servo driver broke today, out of nowhere. The error number is 6- voltage drop -> defective thyristor module.

Try asking for the circuit diagram Hurco-Germany branch. Give them the serial number of the machine.

Set the spindle P term to 0 and you should have the proper output voltage

(P must be 0 unless you have spindle encoder feedback working)

Offset mode true is correct for a 7I97

Hi,

Sorry for the late feedback.
We set P to 0 and now we have the right output voltage and it runs very good.
Than we try to adjust the PID Controller for the Y-axis, the maximum speed is now at 10m/min.

A few months ago I called Hurco, unfortunately there is almost no interesting documentation in the archive for this machine, I was told that the documentation was not well maintained in the past.

Unfortunately I don't have time at the moment to continue with the Hurco, it will take a few more months.