Re: (ET) E15 Alltrax died

["subscriptions aeolusdevelopment com" <subscriptions aeolusdevelopment com>]

John Jeno 
>Question is, does the snow thrower generate a voltage spike when
>shutdown?

If all that happens to shut down the blower is a contactor opening then
absolutely.  Where it goes and if it is big enough to kill the controller
are separate questions.

>The power cord only has 2 wires hooked up to the drive, should the third
>be used ala the mower drive?

The third is presumably being used to brake the mower deck by shorting the
PM motor.  Snow blowers are not usually seen as having the same hazard.
Short sighted IMHO.  Maybe it come of hearing of farm machinery accidents
but I've a lot of respect for any implement that draws material in to chew
it up.

> Should there be a clamping diode in use?

I'd put one on just on general principle.  But back it up by shorting the
motor.  The diode takes the transient while the contactor closes across the
motor and then the contactor takes the brunt of the load.

I am assuming it's a PM motor.

> Thanks to whoever knows.


I'm just working from first principles.

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That's rather amusing.

Robert


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