Re: (ET) Diagnosing delay error on E15 board

["David Roden" <etpost drmm net>]

On 27 Oct 2011 at 16:29, CZ wrote:

> Reversing the field was probably the stupidest idea they could have come 
> up
> with ...

Actually, that's an entirely reasonable way to reverse a separately 
excited 
motor.   I think (but am not 100% positive) that's the way the Alltrax 
does 
it.  

As I understand it - and warning, I'm not an EE - because the field 
operates 
at relatively low current, it makes more sense to reverse it with light, 
inexpensive relays or semiconductors, instead of using expensive, heavy 
high 
current contactors or semiconductors to reverse the armature's polarity. 

I guess it's just the GE didn't design proper field handling into their 
E15 
controller.  Maybe it's easier to do that when the field current is 
controlled by a microprocessor?


David Roden - Akron, Ohio, USA

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