The Dreaded X axis stepper error using UC400ETH and UCCNC !!!

[dachopper]

Ok - I thought I would put some closure in here..... The random X and Z axis ' jams' were 100% due to electrical interference from the spindle control wires.

I had unshielded control cable, with shieleded stepper cable

Then I tried shielded control cable but mistakingly placed the machine earth inside the Spindle power cord, and in doing so charged the entire machine up with a generated AC signal.

Then I earthed the frame + spindle + spindle shielding + stepper motor shielding seperately to house earth, and finally, no issues !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[dazp1976]

Motors are NEMA23 381oz/in 3.5A Single Shaft Stepper Motor KL23H2100-35-4A, 0.9 degree.

Power supply is PS-10N68 - 1000W 68V Power Supply running 4 of the above steppers, ( two of the motors would have been on 50% current hold ) when the other motor stalled also.

Nema23 running on 68V???

[Neale]

Nema23 running on 68V???

Nothing wrong with that. Most of us run NEMA23 size motors on about 68V. More volts, better performance. The motors are happy enough - mine have been running like that for about 7 years now. As long as your driver can take it (and again, that's why a lot of us use 80V drivers) there's no problem. Just tweak the max current settings on the drivers so that the motors don't overheat.

Somewhere there is a guideline formula (originally from the Gecko people, I believe) that suggests that around 50V is the optimum. Firstly, this is a guideline and not a hard-and-fast rule, and secondly, it's wrong anyway. Go by other people's experience!

[routercnc]

Agree. My steppers have been running at 68V on 80V drivers for several years too.

[dazp1976]

Agree. My steppers have been running at 68V on 80V drivers for several years too.

If I'd figured that out before, I'd have got the 570oz nema23 on 60v for the AMAT25 rather than the nema34 on 60v I have.

[Ger21]

If I'd figured that out before, I'd have got the 570oz nema23 on 60v for the AMAT25 rather than the nema34 on 60v I have.

It's not that simple.
A 450oz Nema 34 rated at 6 amps will usually easily outperform a 570oz Nema 23 rated at 5 amps.
Inductance plays a large role. And typically, smaller nema 34 low inductance motors can spin much faster than large Nema 23 motors.

[JAZZCNC]

If I'd figured that out before, I'd have got the 570oz nema23 on 60v for the AMAT25 rather than the nema34 on 60v I have.

Horses for courses and You've got the right motors and voltage for that machine. Routers are a different animal so extra torque higher up speed curve helps.

[m_c]

It's not that simple.
A 450oz Nema 34 rated at 6 amps will usually easily outperform a 570oz Nema 23 rated at 5 amps.
Inductance plays a large role. And typically, smaller nema 34 low inductance motors can spin much faster than large Nema 23 motors.

Ger, I think you got your motor sizes mixed up there...

[Clive S]

Horses for courses and You've got the right motors and voltage for that machine. Routers are a different animal so extra torque higher up speed curve helps.

Bloody hell Dean where have you been Nice to see you back

[JAZZCNC]

Bloody hell Dean where have you been Nice to see you back

Got to get back on the horse some time Clive.