34V or 68V

[Christian]

I'm run my new steppers bi-polar parallel and now I'm a bit confused; Should I use 34V or 68V (the choise of my power source). Does this effect the max current?

Either way my powersource (400VAC) can take the load. So can the filter capacitors (30,000uF /100V). So there is no limit.

Thanks
-Christian

(Sorry for all these questions i put but I'm currious)

[arvidb]

For a fixed power supply capacity (watts or VA), if you double the voltage the supply can only deliver half the current before blowing fuses (or going up in smoke if badly designed).

On the other hand, if you double the voltage to the load (motors), they will draw double the current (4x the power) - unless you use a chopper driver with current limiting, in which case the motors will draw half the current at double the voltage (same power as before).

I'm not completely sure about the chopper drive current consumption, but logic tells me it should work that way.

Arvid

[ger21]

It depends on what your motors are rated for, and how many you are using.