I am working on a y axis splitter circuit, and purchased two new inexpensive drivers to test it - see attached data sheets(2). Prior to testing the board, I am testing each driver with one stepper at a time. Here are the details of my test setup:
Wiring
Power supply is 24V 5A straight to VCC and GND of driver
I have DIR+ and DIR- coming directly from A axis outputs of Masso G3 to CW+ and CLK+ respectively of driver
I have CW- and CLK- of driver to Comm- terminal block (I have a star configuration for GND, Comm-, and VCC+ in my enclosure)
The stepper wires are connected to respective driver inputs A+, A-, B+, B- Stepper motor is 23HS22-2804S - see attached data sheet
*I have left EN+ and EN- open as shown in a variety of videos/online texts which should keep driver in enabled state
Driver settings
SW1=on
SW2=off
SW3=on
S1=off
This should set current to 2.0A
S2=0n
This should be 20% holding/stop current
S3=on
S4=on
This should set 1/8 step (micro stepping)
S5=off
S6=off
This sets decay setting to 0%
Masso A axis settings
Please see attached config image
The issue
The odd behaviour is that the stepper motor will move on its own without any DIR+ or STEP+ signal generated by the Masso G3. Sometimes the driver's RUN LED will flicker on when this happens, but usually not.
When I touch the shaft it feels like it is rotating in single steps, other times the rotation is greater and easily seen by the tape 'flag indicator' attached to the shaft.
I did some research, and some discussion talked about certain electrical connections being 'open' as causing this, but the only thing that is 'open' is the EN+/- which many did in the Arduino videos/tutorials.
I also revisited the Masso document, where some wiring examples show STEP+ and DIR+ as the only driver connections, while others show both +/- connected depending on the driver.
From the TB6560 manual, it looks like I have it set up as 'common cathode', which I think is correct for mMasso and this driver.
The only thing I did not do is connect the EN- as well to the Comm- as I did the CW-/CLK-, so I am not sure if this is the cause.
The stepper seems to be working, CW and CCW, responds to G0 and G01 MDI commands as well as A+ and A- jogging.
I thought the stepper would run silently, but perhaps this is a function of the micro steps chosen, and the fact that it is running with no load.
I should also mention that my X, Y/B, Z axes are all working as expected (different stepper motors/drivers), and that the A axis was working as expected when it was controlling my tangential knife rotary axis.
I would appreciate any insights as to what is happening and why, and how it may be resolved.
Help troubleshooting odd stepper/motor behaviour
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