Remora - ethernet NVEM / EC300 / EC500 cnc board

What does it do when you try adjust the speed? Is it a VFD you are using? What is the speed input to the vfd pwm or 0-10v analog. Have you the VFD wired correctly ?

Murphy wrote:

What does it do when you try adjust the speed? Is it a VFD you are using? What is the speed input to the vfd pwm or 0-10v analog. Have you the VFD wired correctly ?
 

OK, This is a Merckweir MK300 VFD that was installed from the factory. As par for the course with this machine, the unit is an old out of production version. All this that I am trying to do now is to salvage the purchase of this mill after taking a giga hose job and losing over $3k.

To answer your questions in order -
1. Nothing happens when I try to adjust the speed. Whether I issue an M3 S100 or M3 S15000, the speed is the same. VFD panel reports 3500 rpm, or at least I think it's RPM, anyway, no change.

2. Yes, VFD

3 The input is suppose to be 0-10v and if the translator on my phone is correct that is connected to the AI1 (0-10v analog signal input) on VFD

3. As far as I can tell.... There are only 3 wires, COM, AI1 for the 0-10v analog and X1 that connects to spindle out1 (spindle-cw)

Measure the input voltage at the VFD it's probably at 10v constant ?
​​​​​​ Yes you can also hook up outputs for  FWD and REV.

Actually, no. Spindle 'ON' shows 0v between COM and AI1.

sorry spyder, i had a provision set up so you could do everything from ini file. just sawp these 2 lines, uncomment the one

for the outputs, yeah you need to change them to whatever your outputs are

Murphy wrote:

When I hook a multimeter up to the vfd 10v in, the voltage physically drops near to Zero if a lot of speed adjustments are done. So I can see now what is happening but iv no idea why the voltage drops so much. It must be something to do with how remora outputs the signal ? 

Thats what we needed to see, but this is somewhat expected by the reading from the halscope of SP.0 . alright, well this can be 2 fold. either the RT1052 firmware is doing it, or the analog circuit is messing up. It doesnt show up on mine because Im using STM32 firmware, and Im using PWM.

OK, at this point I think I need to rip out this junk, out of production, no clear manual VFD and buy a new unit that has a video on how to set it up. At least that will eliminate one variable as I have no way of knowing if it was ever set up correctly and that subject is way off topic for this forum.

So if I can get a VFD that I can program and setup correctly, you all think what I have for a configuration will work then?

I wouldn't give up on the VFD yet, if it requires 0-10v it should work. I think you can test it externally with a potentiometer. Post your .hal file. You can hook a multimeter between com and AI1 of the controller . If that's still 0v there is more than likely something wrong with the code.

Look at remora.sp.0 in halshow and see what it's doing when you adjust speed

Thanks Cakeslob, I forgot your using the stm32 :/ the code in the hal file is the same for 0-10v and PWM ? Just the gain determines the difference?
In my VFD there is an option for 0-10v, 0-5v and external digital signal. Is it 0-5v or digital signal for PWM ?

@scotta , any ideas why it's doing this?

For now I'll address the next question I have. My machine was built with all 6 proximity sensors wired in series inside the machine with only 1 wire for signal. Homing works but any attempt to add the limit switch part in results in a failure to home after the first axis, saying that a limit switch was tripped. Reading through the forum, I saw a few mentions that it should be possible, but there were no actual examples of how it is done. The best I found was one with all 3 homes on one pin and all 3 limits on another. For now it is moving OK, (I figured out how scale works) and got it set right. Tell it to move 10mm and it moves 10mm. so I can fall back on the soft limits... Better than nothing.