From: andy pugh [mailto:bodge...@gmail.com] 
> On 4 March 2017 at 16:33, Ben Potter <b...@bpuk.org> wrote:
> > On power up Z ran at maximum speed until I hit e-stop

> So, the Z was blowing the fuse, but now it runs at max speed?
Yes, but the same drive connected to the X motor/tacho also runs at max speed. 
Have not tried the X drive connected to the Z motor.

> Do you have tachometers?

Yes, they're SEM motors - DC brushed, tacho + 11ua sin/cos encoder.

> --
> atp
> "A motorcycle is a bicycle with a pandemonium attachment and is designed for 
> the especial use of mechanical geniuses, daredevils and lunatics."
> — George Fitch, Atlanta Constitution Newspaper, 1916


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