Drive recommendation

[DickDV]

I haven't seen anything that warrants a VFD. It's a ridiculously expensive way to get a fast stop if you don't need variable speed for the terminal velocity.

Without a VFD, I'd look into an oversized DC injection brake triggered by an Across-the-Line starter with a modular mechanical brake module added if the DC stop isn't fast enough.

VFD's are intended for applications where you want to vary the end speed and centrifuges generally run up to the same speed on every cycle.

 

[jraef]

Yes. Except... A dynamic brake system moves the kinetic energy OUT of the motor and burns it off as heat in the resistors. With a DCIB, that kinetic energy is transmuted to additional heat in the MOTOR. If you don't do it often, that might be ok, I'm just pointing out one possible valid reason for using DB instead of DCIB.

But again, if you want to stop it faster than it starts ATL, use a mechanical brake.

 

[brandoncosta]

I would suggest a brake from Intorq. If you want to use a VFD for this application, I'd highly recommend that you replace the motor too.