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(ET) Alltrax question.



OK, I received my 2nd replacement unit from alltrax last week and revisited all my previously done wiring on my E-20 tractor.  I traced everything to insure that I had everything correct and in line with the alltrax schematic diagram.  The first unit smoked on me upon firing it up the first time.  This time around, I received a red led when I turned the key switch on, which indicated something amiss in the throttle circuit.  I removed the curtis pot and switch assembly which I have mounted as the foot control on my tractor.  Checked continuity of the wires and they all looked good.  Tried key switch again and this time received 6 red blinks which point to Battery undervoltage according to spec sheet.  This seemed like it may have been correct, as the batteries have been out of the tractor for some 6 months now, so I plugged the charger in overnight to let the curtis unit charge them.  Next time key was turned, the led started blinking 7 times, indicating overcharge.  Measured pack and voltage was @ 37 vdc, which didn’t seem to me as being too high.  I then decided to check the other functions of tractor, i.e. front lift motor and lights which worked fine.  Next tried the PTO switch and heard the contactor engage, then everything went BAD!  Controller started to fizzle and then smelled smoke coming from it.  Bummer ):   I immediately removed power from tractor, but the damage was already done.  Upon a closer inspection I discovered that smoke was coming from the 1 ohm 10 watt resistor, which was red hot to the touch, and the fizzle was from the alltrax unit.  I had 2 of the ANN fuses installed in the line this time, 1 on the positive side and the other negative side.  Neither fuse blew, but the controller certainly did and my frustration is really mounting.  I know that others have mentioned having problems when engaging the PTO in there installs, and am wondering if anyone has figured why pto would cause such a surge in the circuitry.  I did not have anything plugged into the PTO plug when I flipped the switch.  Someone in this group had mentioned leaving the PTO out of the circuit and wiring it separately and I am wondering if they could comment on this.  I haven’t talked with Steve Richardson about this yet, and am almost embarrassed to call him on this before hearing what others have experienced.

 

Thanks,

 

Bob K.

 

 


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