Re: (ET) controller

[Jim Coate <jbc_lists_NO_REPLY coate org>]

The Alltrax version starts with the field slightly weakened, at around 2 
amps, and then if turbo mode is enabled, will reduce it to around 2/3 of 
an amp for top speeds (numbers by memory... not exact).

The main contactor is there as a safety for when the operator is unable 
to manually shut down power. This is a big deal for on-road EV's.
For an Elec-Trak, the seat switch is wired in series with the contactor 
coil, so if anything goes wrong and the operator falls off the tractor, 
the tractor will stop. Wiring the seat switch to the KSI input will 
accomplish the same thing, *as long as* the controller is working 
properly. But as a "what if": if the controller fails full on, the 
tractor lurches forward and throws the operator out of the seat, 
disabling the KSI input won't stop anything. Having the seat switch 
wired to drop out the main contactor provides a second level of safety.

Brian E. Haines wrote:
>  The manual differs slightly from the controller.  The min is 2-20, the 
> max is the min that was set to a max of 60.  So you can put the min and 
> max at 2a, but that would basically take away the field weakening. 
>
> What is the field current limited to in the Alltrax sep-ex version for 
> the ET?

Clean Power Supply wrote:
> Actually,what I use instead of a contactor is a Master Disconnect
> Switch,one of the new ones with the silver contacts,not the old
> "crates". Thereby you eliminate one more potential problem area
> (the contactor) but still have a shutoff.


--
Jim Coate
*The Electric Tractor Store*
http://www.ElectricTractorStore.com

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