Re: (ET) Alltrax output!

["David Roden (Akron OH USA)" <etpost drmm net>]

On 23 Oct 2006 at 15:52, Doug McCorkle wrote:

> seem to get only about half
> the speed as previously.

That's normal.  It's because the Alltrax doesn't do field weakening.  
Essentially, you lose the E15's top 4 speeds, but get infinite steps 
between 
the bottom four.

In this situation, the top ground speed you can attain isn't an indication 
of 
whether the unit can produce its rated power.  Nor is steady-state 
current.  It 
would be entirely normal to measure only 16-20 amps at full throttle if 
the 
motor were lightly loaded.  

Saying that this indicates something wrong is like saying that a 400 watt 
Macintosh stereo amplifier is broken because it produces less volume at 
the 
halfway knob setting than a cheap Radio Shack compact system at the 
same knob setting.  In both cases - volume control or throttle control - 
the 
steady-state output tells you nothing about whether the controller is able 
to 
produce its rated output.

You would need to measure full-load current to determine whether the 
controller is producing full output.  Try measuring the current while 
acclerating up a hill.  Even that may not be enough load for a full-load 
test.