Quote Originally Posted by PaulP View Post
They do work but when I fire up their linear power supply you can hear a very slight whistling sound, it's high pitch and really annoying to be honest, when they drivers get the ENA high signal they switch off and go quiet. These motors were bought from zapp some years ago but I can't find them on zapp now so am unable to confirm the drawing is defo for this motor. The motors are labelled as SYS80STH86 - 3008BF. Do you hear any sounds from your AM882 powered motors when they are idle?
Ok, I understand the 4 wire ref now I just had to ask to eliminate any chance of any silly misunderstanding because series or parallel you are using 4 wires.

The noise you are hearing is normal and if you haven't done the auto-tuning they will even scream/squeal sometimes. The reason why the motors go quiet when ENAble is set is that the motor output in the drive is disabled.

Your motors are Nema 34 so running them in parallel becomes even more important for a router. Large motors like these have a higher inductance than smaller NEMA 23 motors which means you require more volts to get the same rpm. Torque drops away much sooner up the curve with NEMA 34's so if you have them wired in series this compounds this even more which is why higher volts are needed to get high speeds out of nema34s.

What does bother me and makes me wonder if you have an issue is that while they won't spin fast when wired in series they shouldn't easily stall at lower RPM and no way should a few bristles from a dust shoe cause missed steps.? A series wired NEMA 34 with 68V should rip that dust shoe off the machine and not even know it's done it.!

If you wire the motors in parallel and set the current to 4.2a then with 68Vdc you should expect to get approx 900 to 1100rpm before torque starts to drop away at any significant rate. So if you have a 5mm pitch and are getting 6000mm/min without stalling then your about right, but if you have a 10mm pitch then you should be seeing roughly double that.!


Quote Originally Posted by PaulP View Post
So does the PeakCur box in ProTuner refer to the total amperage the driver supplies to each coil or to the motor? If a spec sheet says 2.5A or 4.0A per phase do I double that figure in ProTuner's PeakCur box? This is what I find hard to understand, If Leadshine stated that the figure was for each phase or if it was for each motor in total it would make it much less confusing.
The setting is per phase so just set protune to the spec sheet per phase rating ie: 4.2a





I'm running 4x AM882 drivers with a 68v/500W PSU (Leadshine) to 4x SYS80STH86 - 3008BF currently wired in series. As for vel/acc I'm running OK at 6000mm/min with 1200mm/s2 without stalling.


Thanks again chaps, I can see my soldering station coming out again soon but before I do that will I need another 68v linear power supply to deal with the extra amps required for parallel? I read many posts from those that went from series to parallel and have had better results but it was either laziness or amperage concerns that pointed me to wire them in series.[/QUOTE]