Re: (ET) tractor no worky

Mike,

Check the varistor on card #3 – little round disc. It may be blown. It suppresses voltage spikes from the SCR’s across the motor field.

Also, all connections to PC card.

And, relay contacts.

…Walt

From: jlantonucci comcast net [mailto:jlantonucci comcast net]
Sent: Wednesday, May 21, 2014 2:27 PM
To: Michael S Briggs
Cc: elec-trak cosmos phy tufts edu
Subject: Re: (ET) tractor no worky

Mike - check you battery voltage. Highly discharged batteries can cause those symptoms. Then check your relays.

Some people use Curtis controllers (or others) but the Alltrax is the only one specifically designed for our tractors.

Jeff

From: "Michael S Briggs" <msbriggs unh edu>
To: elec-trak cosmos phy tufts edu
Sent: Wednesday, May 21, 2014 2:14:37 PM
Subject: (ET) tractor no worky

I just replaced my batteries in my E15, since I was down to about 15-20
minutes of mowing time. With the new batteries, I pushed the speed lever
forward, and just got a bunch of clicking. I checked the forward/reverse
relay, and it looks like it's blown - so I replaced it with another (I
have lots of those onhand). Now, when I move the speed switch to the left
to put it in reverse, the new relay just makes a constant clicking - as if
it's rapidly switching back and forth or something. When I try to get the
tractor to move (forward or reverse), I still just get that clicking, and
no motion.
Any ideas?
On a related note - is the Alltrax the only option for upgrading
to a PWM controller?

Thanks,
Mike

--------------------------------------------------------------
Michael S. Briggs, PhD
UNH Physics Department
(603) 862-2828
---------------------------------------------------------------

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