[Andrey67]

Today has finished installation UHU HP on my machine tool. It works! I am very happy!

[contactirfu]

Congrats Andrey - another feather to the cap!

nice looking heatsinks - and a very compact setup!

have fun!

[Andrey67]

I have a question. The motors heat up to 50 degrees of Celsius in 30 minutes. It is possible to struggle somehow with this problem? Motors are presented on a photos.

[contactirfu]

First thing is this a problem at all?

after 3 hrs - my motors are hot - though not exactly measured the temperature - but still hot.

I think you can try by limiting the current - in my case I have more current flowing in than required.

if possible chk with a clamp meter the current which is drawn here.

also does your UHU heatsink get hot?

RGDS
IRfan

[H.O]

50 degrees celcius shouldnt be a problem, If it stabalizes there I wouldn't worry about it. What's the Vref on the HP-UHU board set to? It looks like the plate on the motor says 9.5A so you should set Vref to around 95mV.

If the motor has very low inductance the larger ripple current might contribute to the heating. Adding an external inductor to smooth the current might help but will affect the performance of the motor slightly.

But again, personally I wouldn't worry about the motors getting 50°C. For reference the datasheet for my motors specs a 50°C rise when operating at it's continuos rating (ie. 70°C case temperature at 20°C ambient).

/Henrik.

[Andrey67]

Irfan and Henrik, thanks for answers!
I do not know temperature will increase further. I worry for encoders HEDL-5640#A06! Unfortunately I have not measured temperature UHU heatsink! Vref precisely to measure it was not presented possible. Voltmeter indications not constants. Figures constantly "jump". Exposed an experiment method while work of motors did not become smooth and stable. Can motors not are intended for long work? Can to me cooling by fans will help?

[H.O]

Hi Andrey,
If Vref is not stable there's something wrong with the board, your setup or the instrument you're using to measure Vref.

Power up the logic supply for the board (15V) but leave the motor powersupply turned off or disconnected from the HP-UHU. Set your instrument to measure DC-voltage (200mV range if it has one) and connect the black lead to GND of the incoming logic power, then connect the positive lead to the Vref test-point on the PCB, next to trim-pot. The voltage must be stable and adjustable with the trim-pot, set it to around 95mV.

Forced air cooling of the motors will help with the temperature but if the current limit circuit on the board doesn't work then you're in trouble. Make sure you get a stable Vref so you can set the current limit to what the motor is rated for.

What is your motor powersupply voltage?

/Henrik.

[Andrey67]

Hi, Henrik!

I spent measurements as you write. But tomorrow I will try once again. When motors have been established on the machine tool, axis Z did not move upwards. I rotated VR16 while axis Z has not begun movement. On other axes VR16 it is established in average position.
72V is my motor powersupply voltage.
Andrey.

[contactirfu]

may be your mosfets have given up ???

[Andrey67]

may be your mosfets have given up ???

Can be. But any time (20-30 minutes) an axis "Y" works correctly (but if at this time to use pendant non-uniform rotation of the engine is observed), and then again Error. I constantly supervise temperature mosfets. The temperature did not rise above 38 degrees. How to me to check up mosfets?
Has restarting Windows and start a cycle again 3 times. Errors were not. I will observe further.

[H.O]

Perhaps the pendant is commanding a step-rate that the motor/drive can't keep up with so the drive faults on following error. Take the pendant out of the equation for now, there might be something wrong with it or the software used to interface it.

Next thing is to swap the X and Y drives and see if the faults "follows" the drive. If it does, you know that you have a problem with the drive. If the fault stays on the Y-axis (which is now using the X-axis drive) the problem might be with the motor and/or encoder and wiring.

/Henrik.

[LZ1TWB]

Hello,

Nice machine and compact drive enclosure but I have some concerns I may share. Firstly this is a very low induction motor which I think is not suitable for the UHU. You should not have disassembled it, this lowers the magnets strength just as in steppers. The wire, that is seen is used to charge them with a current pulse when the motor is already assembled. You cannot rely on the N/m specs that the label claims now.

Compact design on the drive system is nice but putting the servos in the computer case will lead to nothing but problems. Not because that the computer is rather noisy and can trigger errors in the UHU but the drive itself is a very powerful source of noise also. I myself have had problems with a keyboard going crazy when operating. It is just not good that it changed screens in windows while still jogging the motor. Thank god I got the soft limits turned on that time. From my opinion these things should always be separated, filtered and well shielded.

Anyway thanks for sharing your valuable experience with us, I am happy when someone makes a real machine working with the UHU. There are as many as 3000 items sold as I know and so few details on things done with them.

Thanks,

Todor

[Andrey67]

Thanks all for answers!
I think, that my error was that I have established too big loading (Units/Min)on the motor. Therefore it also has stopped, and- "Error". When I have reduced loading by the motor, I have made three details and "errors" was not.
Thanks,
Andrey.

[Andrey67]

Hi,
I have used the UHU HP 6 years without problems!
But yesterday I had an Error for the axis Z. If I take off the timing belt, the motor turns without problems. A small load leads to an error after a while (even when I omit the table down).
How to start troubleshooting?
Is it possible that the Vref for Z has been changed?

Thanks!
Andrey

[Andrey67]

Is it possible that the Vref for Z has been changed?

The Vref decreased to 70mV (it was 200mV) for axis Z.
But why did it happen spontaneously?
Maybe the reason necessary to look deeper?

Andrey

[kreutz]

Please, re-solder all the components in the Vref circuit, check also the potentiometer and other resistors in the circuit using an ohmmeter. You can also compare voltage measurement with the other controllers that are working ok in order to find the defective component.

Best regards,

kreutz

[Andrey67]

I checked it out and think all the elements are OK.
Now I will set the Vref again and will control of it more often.

How to do so: If any axis is stopped (error) Mach3 stop too?

Regards,
Andrey

[kreutz]

The system should be wired so, if there is an axis drive error, Mach3 should go into EMG stop and the drives should get de-energized. It all depends on your EMG stop circuit wiring and how you want drive errors to be treated in your system. Sometimes you should start the program from the beginning after a stop, it depends on which part of the program is was running at the time, most of the time the part being machined gets ruined.

Regards,

kreutz