Originally Posted by
JeffS
Hi George,
Actually, I learned that grounding the "-" is incorrect. I sent an email to Tom Kerekes of HTH (the company that produces the KFlop) and here is what he told me:
"Hi Jeff,
That link (to the JK1545 drivers) doesn't really include any technical specification. But normally the + pin from the drive is connected to +5V. The - pin from the drive is connected to KFLOP Step or Direction. KFLOP by default drives in "open collector" mode where it basically switches to ground and sinks current turning on the LED in the drive. When KFLOP turns off KFLOP's pin floats up to about 3.85 volts (the pin is diode clamped to the 3.3V supply). There is then less than 1.2V across the LED and it turns off (an LED usually needs at least 1.4V to begin to start turning on)."
As you can see, the "PUL +" and "DIR +" are connected to +5VDC (or +5VDD) on the KFlop, which are pins 23 and 24 of JP7 on the KFlop board. Then the "PUL -" and "DIR -" are connected to the respective axis pins on JP7 of the KFlop board (depending on how you have assigned axis 0, 1, 2, etc. to X, Y, Z, etc.).
I completed this wiring last night and successfully tested all three axis motors using the STEP response function in KMotion, and using the jog funtions in KMotion CNC. My machine is alive!
Now, I have to build an enclosure, install all the electrical components, and wire things up permanently.
By the way, the 50V 14.6A supply, P/N 21C4P3A, from ProtoPlant seems to be working just fine. I'll now more when I start machining, and really stress-testing the system. I'll report back what I learn.
Thanks for your help.
Jeff