eBay TB6560 Stepper Motor Driver Boards

[Mad Professor]

I am using Astrosyn MY103H702 stepper motors <click link for datasheet.

I will do the other tests shortly.

[irving2008]

I am using Astrosyn MY103H702 stepper motors <click link for datasheet.

I will do the other tests shortly.

Same motors I have.

I was wondering if the switches are actually adjusting the idle current when the motor is stationary and not the operating current, the data sheet isnt clear. If that was the case then the 100% setting corresponds to the RMS phase current set by the resistors which would be the RMS current shown by the ammeter

The maximum peak current this could be for these motors on 13.3v (allowing .5v for Vref) is:
Unipolar: 13.3/6.2 = 2A (which appears to be your bipolar series setting)
Bipolar Parallel 13.3/3.1 = 4A
Bipolar Series 13.3/12.4 = 1A (which appears to be your bipolar parallel setting)

Do you have a stand-alone ammeter or a 'scope?

[Mad Professor]

I have tested the voltage outputs from both phases, and they are both powered wile at idle.

Bipolar Parallel: 4.00 to 4.15volts.
Bipolar Series: 12.95 to 13.00volts.

I do have a DVM with ammeter but it is quite old so don't know how good it will be.

I also do have a PicoScope 2202 USB Oscilloscope.

[irving2008]

I have tested the voltage outputs from both phases, and they are both powered wile at idle.

Bipolar Parallel: 4.00 to 4.15volts.
Bipolar Series: 12.95 to 13.00volts.

I do have a DVM with ammeter but it is quite old so don't know how good it will be.

I also do have a PicoScope 2202 USB Oscilloscope.

Easiest way to verify the current is to plot the voltage across the sense resistors. If you have the latest PicoSoft 6 software it will, if I recall right, calculate the RMS and peak currents for you (I have a Pico3205 scope), or you can easily work it out...

[Mad Professor]

I am running PicoScope v6.3.4.0.

I have not had this scope long so I am still finding my way around the settings, so I am not 100% sure what you are after.

Bipolar Parallel:
True RMS Avg 120mv.
Peak to Peak Avg 1.15v

Bipolar Series:
True RMS Avg 80mv.
Peak to Peak Avg 30mv.

[irving2008]

I am running PicoScope v6.3.4.0.

I have not had this scope long so I am still finding my way around the settings, so I am not 100% sure what you are after.

Bipolar Parallel:
True RMS Avg 120mv.
Peak to Peak Avg 1.15v

Bipolar Series:
True RMS Avg 80mv.
Peak to Peak Avg 30mv.

1.15v peak over .33 ohm = 3.5A peak, RMS = .36A

80mV over .33ohm = 0.24A, but the peak looks low, sure it wasnt 300mV?

Can you post the waveforms?

[Mad Professor]

Sure I can save the waveforms, do you want them as screenshots or save the waveforms to an output file?