Re: (ET) Resistor Strap

Thanks for responding. It is a three speed controller. Not much slow maneuvering. While snowplowing in D1 the power use meter stays at the upper end of the green.

When I first got this tractor in 2000, the power use meter ran in red and sometimes pegged when tractor under load. Don't remember checking for a hot resistor strap but did see in the homeowners manual that the shunt should be 20" long; mine was almost 21'"...reinstalled it at 20" with no more running in the red.

Is it wise to re-install the shunt at 19" to help with the current problem?

Thanks, Jack

----- Original Message -----

From: RJ Kanary

To: John Casey ; elec-trak cosmos phy tufts edu

Sent: Friday, December 09, 2005 6:36 PM

Subject: Re: (ET) Resistor Strap

          Ideally, it should not be hot at all . Reality however is different. The only time the resistors are in the armature circuit is when the first two or three speed positions are used ,{Depending on whether or not your tractor has three, seven or eight motor speeds available.}

     Once the resistors are bypassed by the contactors, this is when the most efficient operation is achieved.

    If you are doing a lot of slow maneuvering , this is when your electrons make more heat than torque.

       On the plus side, it DOES keep the snow off the hood. :)

----- Original Message -----

From: John Casey

To: elec-trak cosmos phy tufts edu

Sent: Friday, December 09, 2005 5:06 PM

Subject: (ET) Resistor Strap

All:

How hot should the resistor strap get?

I plow a neighbor's driveway and my own, about 200.' Last week we had a 3" snowstorm and I stayed in D1all the way.

The perforated metal over the resistor strap was hot to the touch but not hot enough to make me remove my hand....of course, the strap would have been hotter. Battery clamps were tight and cool, traction motor luke warm, contactors warm, diode/varistor block looks okay. Today we got 10" of heavy snow and not to be stupid I stayed in L1 all day. The perforated metal cover was only warm and other avovementioned checkpoints were normal. After clearing snow from both storms there was plenty of tractor range left.

The 9 page 'Owners Use and Care Manual" shows that snowplowing can be done in range D2. I would like to plow in D1. Can anyone tell me what the acceptable heat level is with this strap.

Thanks, Jack

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