Re: (ET) Thinking out loud

I posted a diagram of a circuit I created for my E15 here,

https://picasaweb.google.com/rodnhower/ElecTrak#5572435068601554898

I was going to use it with a Curtis 1204

https://picasaweb.google.com/rodnhower/ElecTrak#

Alltrax released their control specifically for ET's before I started the installation and I

decided to use that control instead (it works quite well!).

Rod

From: "stupidemail5 lycos com" <stupidemail5 lycos com>
To: ev_dave13 yahoo com
Cc: elec-trak cosmos phy tufts edu
Sent: Fri, February 11, 2011 7:20:42 AM
Subject: Re: (ET) Thinking out loud - Controller

I have been running my E12S with no control and 2 switches all winter. A DPDT center ON wired so that down is off, middle is start/low and up is high. DPDT center OFF in place of the f/r relay. Yes it is a death machine, but it made me think that wiring the whole thing with a couple of self holding relays it could be done safely. they actually make delay relays that would make it slick.

My thinking is that I never use lower speeds except for current control, and now some snow blowing. I choose the gear I want and pretty much go full speed. The lack of torque with the resistors makes the lower speeds pretty lame.

I could probably implement with the stock switch array.

The RTN deal is the only hard part, and actually with self holding relays and a 3PDT center off for field reversing that should be OK. The third pole would be in the string for the main start relay so it would drop out when you go to the center position.

Probably a 'go fast' button for field weakening

KG

On Feb 10, 2011, David Brandt <ev_dave13 yahoo com> wrote:

I used a curtis to power the armature and ran the field through a rheostat (E15). The field is usually at full power and it runs plenty fast for mowing in D1. If I want to race it (or run back to the garage when it starts raining), I can weaken the field as much as I want.

The field at full strength only draws about 2 amps. A relatively small rheostat is all that is needed.

David Brandt

--- On Thu, 2/10/11, David Plamondon <roberttroll hotmail com> wrote:

From: David Plamondon <roberttroll hotmail com>
Subject: (ET) Thinking out loud - Controller
To: elec-trak cosmos phy tufts edu
Date: Thursday, February 10, 2011, 12:49 PM

If one wanted to replace just the first three speeds, and not worry about field weakening, is there a simple controller that could do this? To my understanding the controller options that are available have special "software" that allows for the weakening. If i didnt want that, what possible options are there? I would basically be looking to replace the ribbon resistor and card on a E15 - possibly a E20. Thoughts?

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