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Re: (ET) controller
Consider that at full voltage, the E15 motor field conducts only about 2A,
so that would be your max. Measure the resistance of the field and do a
quick I=V/R, assuming a safe value of the max. voltage.
The minimum would probably be somewhere around 1/4 of that or so. It
sounds like this controller would not be that good a match if it is used
to field currents that large, but the best evidence one way or another is
to find someone who has run one and see how well it works.
David Brandt
--- On Sun, 2/13/11, Brian E. Haines <bhaines nycap rr com> wrote:
> From: Brian E. Haines <bhaines nycap rr com>
> Subject: Re: (ET) controller
> To: "Clean Power Supply" <cleanpower att net>
> Cc: "et" <Elec-trak cosmos phy tufts edu>
> Date: Sunday, February 13, 2011, 10:38 AM
> All of this does bring up a couple of
> more questions...
> Would you recall what the field
> min/max you used with the curtis
> controller? The 1244 allows from 0 to 20a min field,
> and 0 to .,...like
> 130a for the max field. Do you recall the field map?
>
> Thanks
> B
>
> On 2/10/2011 6:06 PM, Clean Power Supply wrote:
> > I agree that the Curtis controllers
> used in this manner are quite practical. And now I'll share
> my secret: I have top speed WITHOUT weakening the field. I
> use a larger motor pulley with a smaller trans. pulley,
> sized appropriately to achieve top speed with full field
> voltage. Since speed control with an electronic controller
> is almost infinite,losing the lower gearing is of no great
> consequence.
> > Additionally,I don't use *any*
> contactors,only a master disconnect switch. The switch on
> the pot is used to turn the KSI (Key Switch Input) on the
> controller on and off. A toggle switch with center off is
> used to reverse the field polarity thereby achieving motor
> reversal.The center off turns off the KSI,requiring the foot
> pedal to be brought back to neutral to restart.This prevents
> slamming from F to R while the motor is running and also
> gives a bit more time for the field to collapse before
> polarity reverses.I do use a varistor to help with
> that,though.
> > Sincerely,
> > Harold Zimmerman
> > Clean Power Supply
> > Ephrata PA
> > 717-859-4234
> > Parts Supplier for GE Elec-Trak,New
> Idea& Wheel Horse Electric Tractors.
> >
> > On February 10, 2011 at 4:05pm -0500, you wrote:
> >> I am here to tell you the answer is simply and
> emphatically YES.
> >>
> >> I have an E15 w/a Curtis 36V golf car controller
> in it. When you step on the
> >> "go" pedal (it's an E-15, but I put a pedal on) a
> microswitch closes which
> >> energizes two contactors' coils. When the
> contactors close, they energize
> >> the field windings (full 36v across the windings)
> and energize the
> >> controller. Further motion of the pedal turns a 5k
> pot (a very familiar
> >> set-up to those of you who have messed with Curtis
> controllers, not to
> >> mention others) which increases the current from
> the controller through the
> >> armature. Off you go!
> >>
> >> A simple DPDT allows reverse (an h-bridge for
> reversing the field winding
> >> current). I plowed with that set-up for two
> winters... worked great. Buttery
> >> smooth! Just not much of a top speed w/o the field
> weakening.
> >>
> >> I have NOT put field weakening on that set-up, but
> it would be easy enough
> >> to do using relays and an original resistor card.
> >>
> >> Note that sometimes you can find Curtis 36v Sep-Ex
> controllers on ebay for
> >> short money... I have one that I intend to put in
> another E15 whose original
> >> control system was badly damaged. Got it for $79
> last year... looking
> >> forward to trying it out.
> >>
> >> Oh, speaking of which:
> >> http://cgi.ebay.com/4-CURTIS-PMC-SepEX-DC-MOTOR-CONTROL-24-36-VOLTS-400-AMP-/110642253704?pt=LH_DefaultDomain_0&hash=item19c2cacf88
> >>
> >> Best to all,
> >>
> >> -Max
> >>
> >> On Thu, Feb 10, 2011 at 3:00 PM, Neil Dennis<wombatt gmail com>
> wrote:
> >>
> >>> Just a thought, can you use a PWM type control
> on that motor ? Or change
> >>> to a PM motor and then PWM ?
> >>>
> >>> wombat
> >>>
> >>>
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