On 9/13/2010 12:16 PM, Brian E. Haines wrote:
If I had to guess it sounds like your varister is probably no good anymore. I usually keep a few on hand and just replace it when I got a new tractor. Most after 30 years crumble apart in your fingers. When I kept blowing fuses in E12s, that was my many problems. Even coming to to a lower speed could do it. If I was zipping down a hill and moved it back to 1 quickly I could pop a fuse. To be fair I had other issues with the wiring, but the blown varister was the cause of some of my fuse woes.
Regen is not a problem on the E20, however I have noticed that when I take my foot off the throttle while holding any of the 36v wires I would get a *big* shock from the motor fields collapsing. The MOV is supposed to prevent this.
It's possible mine shorted against the frame, that could explain the big burn. But life without the MOV seems to involve big spikes.
I really need to get this E15 going; although one can throw an E20 into full reverse while going forward it takes the surge/hit on the big double contactors. On the E15 it reverses the field direction and if that's done while moving it will probably incinerate the relay. Given the number of fused relays that came with this wreck, this seems to be accurate :-) But I thought it would watch the field/armature and if it was moving it would not allow one to go into reverse until the field collapsed (ie: was still). Not the case?
Chris
On 9/13/2010 8:12 AM, Pieter Litchfield wrote:Years ago when I bought my E15, the controller card #1 had a large mouse nest on it. Almost all the components had corroded or missing leads on them. With the wiring diagram in the Owner's Use and Care manual, I was able to completely rebuild the card, adding wires or solder bridges to jumper around rotted traces. It worked fine, and is still working. However, I have an Alltrax controller sitting on the shelf, and if I get the time and energy, I will install it. The control circuits on an E-15, even when working right, still leave a lot to be desired. My E-15 has a heavy bucket loader assembly on it, and when moving forward may take a while to come to a complete stop, even using the brake. If the operator selects reverse while it is even creeping forward, it will blow a fuse. Regeneration? Having controls that taper down and ramp up would be better in this application. My current solution is to hit myself in the forehead each time I forget to wait for the complete stop._______________________________________________ Elec-trak mailing list Elec-trak cosmos phy tufts edu https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak