RE: Alltrax, was RE: (ET) Newbie tries plowing and series controllers.

[Rod Hower <rodhower ameritech net>]

I had the same question as Markus, what did you do
with the field current?
If you only pulled 120 Amps max I'm guessing the
field had full voltage?
I'm also assuming this current measurement was in
the battery loop. Motor current is much higher during
acceleration with a PWM control (for example 25% duty
cycle from the control can pull 300 motor amps but
only 75 battery amps on the Alltrax).

--- Markus Lorch <mlorch vt edu> wrote:

> Tim, 
> 
> yes I saw you conversion pictures. Looks and sounds
> great.
> It doesn't look like the 4QD controller is a sep-ex
> controller.
> What did you do with the field. Apply full field all
> the time?
> Or have the field weakened all the time?
> 
> I toyed with the idea of getting the less expensive
> Alltrax SPX
> with 300A for $175 and set the field weakening
> manual via a
> rheostat. 
> 
> Could you also tell us what you used for your 3.6kw
> inverter?
> 
> Thanks
> Markus
> 
> > -----Original Message-----
> > From: elec-trak-bounces cosmos phy tufts edu 
> > [mailto:elec-trak-bounces cosmos phy tufts edu] On
> Behalf Of Tim
> > Sent: Montag, 24. Januar 2005 22:22
> > To: elec-trak cosmos phy tufts edu
> > Subject: Re: Alltrax, was RE: (ET) Newbie tries
> plowing
> > 
> > 
> > I purchased a 4QD PRO-120-36 back in 2002 for $220
> from SLT 
> > Technology, Inc. 
> > I see there are 3 choices now in the US.
> > http://www.4qd.co.uk/addrs/distr.html#USA
> > Tim
> > 
> > PS.  I have never needed more than the 120 amps
> this control 
> > delivers...also, look at the extended brush life
> running on 
> > lower current.
> > 
> 
> 
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