with that many amps you can use relay in parallel.

John


--- peteHVAC <petehvac@optonline.net> wrote:

> > peteHVAC wrote:
> > > I'm adapting a forklift motor to power my trusty
> 72 beetle.
> > > So far the mechanical part has been easy. The
> motor is a 36V 90lb
> > > monster and I'm guessing it can draw upwards of
> 500A. Controlling
> > > this much power has me stumped. I have the SCR
> control board from
> > > the forklift but no schematics. I have found a
> lot of sites selling
> > > controllers but not too much info on doing it
> yourself and looking up
> > > the components for the original controls hasn't
> turned up anything. If
> > > anyone can steer me in the right direction I'd
> be very grateful.
> > >
> > > Thanks, Pete
> > >
> > take a look at the OSMC for a place to start.
> > some big power mosfets IRF1405's and some decent
> fet drivers and your
> > done ;->
> > easy lol
> > --
> 
> Thanks for the link. Very nice I'm now a new member.
> The fets look nice too. I know what the datasheet
> says but can they really
> be run
> at that current? The leads are so small. It doesn't
> seem right 6 gauge wire
> hooked
> to a few little fets. I guess there is only one way
> to find out.
> 
> I heard tell that measuring resistance of the motor
> and multiplying by
> voltage would
> give a close value of the lock rotor amps. any truth
> in this?
> 
> Any good books about dc motor control?
> 
> -- 
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