Gallery, Projects and General > How do I??
Power supply for Nema 23 Stepper ?
John Swift:
most stepper drivers enable input is a negative logic input
no input = drive enabled so the drive workes with no connection to the enable or
both the - enable & + enable terminals at the same potential so no current passes through the opto-isolators LED
connecting a 5V supply across the - enable & + enable terminals will disable the drive !!!
in contrast the step input is a positive logic input and the motor will step on the positive going transition
of the step input
with many Chinese TB6560 or TB6064 stepper driver boards have a simple current reduction circuit that is intended to reduce the motor current when the drive is idle
at best the circuit only works correctly if the step pulse is positive going
(active high with the negative pulse input connected to input common GND
due to a design error on some TB6560 boards the current reduction only works with some of the micro step settings)
John
Buell:
--- Quote from: John Swift on November 29, 2018, 06:08:10 PM ---Buell
can you post a link to the instructions for the pulse / direction board ?
I expect the two terminals labled in Chinese are +5V out from the regulator IC
and the common 0v to the pulse , direction & enable outputs
for your initial test just connect the stepper driver -pulse to the negative supply terminal
and + pulse to the pulse board pulse output
PS
do you have a multimeter ?
with the meter set to ohms
you should be able to test for continuity between the negative supply terminal and the two terminals labeled in Chinese
to find out which is the 0V and which is the +5V out
--- End quote ---
So I have taken It all apart and decided to start again just for my own sanity ! it looked messy and didn't feel I had given this a Fair chance . so results this morning,,,
with the Power from the power supply Now being Turned on and just the supply to the driver and the controller i have the Following as You stated..
24v to the controller....the EN on the controller with nothing attached in The OFF POSITION IS 5v however when the controller button is switched ON is 0v
DIR ON THE controller is 0v both on and off
CLK IS 2.2v on or off
Chinese writing is 0V on or off
and the Last terminal chinese writing is constant 5v on or off
so with just those connections when the power switch is on/off the motor is locked
Have I missed something ? will go back to your drawing and see if i can get this to work ! Wont give up yet....or am i flogging this horse !
Buell:
In my heath robinson way I cut a simple toggle switch in on the wire marked ENA +5v on the driver to the other terminal DIR+5v... outcome is that it locks the motor which is great. However when the On/Off switch is activated ON the motor doesn't run in either direction and the lock is OFF Thus rendering the controller switch useless. However the toggle switch activates the lock in the Off position and activates the Motor in the other ! Is this where the saying " Forward one step back 2 steps comes from " I feel Im close but as they say " A miss is as good as a mile "
Still I haven't blown it up yet !
Buell:
This is as Good as it gets ...The controller has a CLK that was going to PUL- I put an Inline Switch there and It WORKS... When I did it before I assumed it was wrong because the light on the Board was Off and thought It was back to front..Theres a Chap who goes by the way Of NSA on youtube he kindly answered the question and Advised and Seems ok. Think i will put a different type of switch now i know it works . Thanks to all that helped finally got there.
John Swift:
without reverse engineering the pulse generator board I expect the DIR & EN terminals
are connected to on/off switches that either leave the terminals open circuit or connect them to
the negative supply
assuming the step terminal goes to the output pin of a NE555 IC
the pulse output is switching between 0V & +5V
If I am correct
this should work
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