Hi phil,
I wasn,t working on the board for a while, I got back to it last night. I am using Turbocnc as the software to test the setup. Last night I changed the pulse width in TCNC to 0!. The motor started spining (what I found was changing the pulse rate in tcnc had no effect on the motor performance). The fet still gets hot. I cannot replase the irf510 with the ilrz as those are not available here at all. The chopping seems to work as well. 5V was the test setup. Today I set up 24V and the board worked. I haven't changed any of the hardware and also have left the V ref at 0.6V. according to TCNC I am running at 35 ipm. If I increase the pulsewidth the motor slows down!! Disabling the chopping stops the FET from getting hot but the motor startes getting warm !. I am baffled...
Ta
MKS
p.s. thanks for patience in coping with my ignorance.... |