RE: (ET) Electric Chipper/Shredder?

[Klein Robert W NPRI <KleinRW Npt NUWC Navy Mil>]

Instead of a contactor, I was going to use the existing belt tension 
pulley engage mechanism.  It's right at the unit and tightens/loosens the 
drive belt between the motor and the chipper/shredder.  I would use the 
tractor PTO on/off switch to engage the motor and the tension lever to 
engage/disengage the unit.  Simple and lowtech.  Guess I'll have to take 
pics and post on the elec-trac site.

Bob

-----Original Message-----
From: Markus Lorch [mailto:mlorch vt edu] 
Sent: Wednesday, September 15, 2004 8:19 AM
To: 'Klein Robert W NPRI'; elec-trak cosmos phy tufts edu
Subject: RE: (ET) Electric Chipper/Shredder?


Bob,

(assuming its the same motor as the E20 has)

I think that should work just fine. You would put the field in 
parallel to the armature. I would keep the large klixon breaker to 
interrupt power to the armature and field in case of an 
overload. Maybe you would want to also hook up a large 
contactor (like the PTO contactor) that could interrupt the power. It 
would be triggered by an emergency stop switch mounted directly on the 
chipper and by the motor internal temperature 
switch (there are 4 small wires coming out of the motor,
two are the field, the other two are the temp. safety switch)

Without this emergency-off button it may be too dangerous to 
operate the chipper a few feet away from the tractor as you would be 
unable to turn it off from where you operate/feed the chipper. Further 
more if you have a heavy duty resistor 
laying around the contactor could break the motor by directing induced 
armature current through the resistor. (you could also short the armature 
but I think that would chew up the contactor rather quickly). 

Markus



> -----Original Message-----
> From: elec-trak-bounces cosmos phy tufts edu
> [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of 
> Klein Robert W NPRI
> Sent: Mittwoch, 15. September 2004 08:08
> To: 'elec-trak cosmos phy tufts edu'
> Subject: (ET) Electric Chipper/Shredder?
> 
> 
> I recently picked up a ROTO HOE Mdl 500 chipper/shredder.
> Originally came with a 5hp to 12hp IC engine.  Thins one was 
> engine less as it used the power takeoff pulley from the guys 
> tractor.   Anyway, I have a NOS E-20 drive motor sitting on 
> my shelf and wanted to hear what everyone thought about 
> converting it to electric.  Is it as simple as some mounting 
> bolts and the appropriately sized pulley?  Then I could just 
> plug it into the mower deck/snowblower plug and go to town!
> 
> Bob Klein
> Wheelhorse C-185
> 
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