Re: Curtis controller model numbers

[Rich Rudman <rmanzan@tscnet.com>]

Rod Hower wrote:
> 
> Hey Rich, if you do have a schematic, send it my way.
> I can look at Orcad and powerlogic (ie. power-illogic).
> File size is not a concern.
> 
> Thanks,
> Rod
> 
> Otmar wrote:
> 
> > James Massey wrote:
> >
> >> Hi all
> >>
> >> We have in for repair a couple of Curtis 1209B-7204 controllers, rated as
> >> 72-120V, 275A.
> >>
> >> Q1) Do Curtis rate controllers on motor amps, battery amps, or both
> >> the same?
> >
> >
> > Motor amps, which never exceeds battery amps.
> >
> >> Q2) Does anyone have data on what this controller is supposed to do?
> >
> >
> > PWM the output to control a series motor. The rest is safety and
> > protection.
> >
> >> the
> >> customer has an OEM connection drawing, showing the 4 power terminals, a
> >> 2-wire pot and a control wire on the 3rd terminal - but it fails to show
> >> where the other end of this control goes to! we suspect it is switched B+
> >> w.r.t. B-, but can someone help?
> >
> >
> > Control wire is called KSI and it goes to B+ to turn the controller on.
> >
> >> Q3) Those of you who have had Curtis failiures, what failed and do you
> >> know
> >> why?
> >
> >
> > #1) Water in the unit
> > #2) freewheel diodes overheat, short and blow the fets. The current
> > limit has no control below 10% duty cycle on the "B" models and
> > therefore can not maintain safe currents with a low resistance motor and
> > high voltage pack at stall. This makes the diodes overheat.
> >
> >> As an aid to repair we are drawing up the circuit.
> >
> >
> > I did that 10 years ago on a 1221B. (wow! has it been that long!) Later
> > Rich Rudman cleaned and corrected what I scribbled. I believe the
> > control board of the 1209 is very similar if not identical to the 1221.
> >
> > Rich, have you got an electronic copy handy? A gif would be great, but
> > if you have the OrCad file I think I could get someone to distill it
> > into pdf.
> >
> > -Otmar-
> > http://www.evcl.com/914  My electric 914
> >
> > http://www.CafeElectric.com
> > Mailto:otlists@evcl.com
> >
> >
Otmar sent it back to me, and I have restored it to my 200. It's in
STD-386 format, with a Library file.

Can you handle that?

Rich Rudman
Manzanita Micro