Help - dead EV-long

[dmacf@pathcom.com]

Hello

I bought an already converted '89 Firefly with a GE EV 15 controller and
a GE 20.9 HP motor. A month ago, I finally installed a new battery pack.
I drove the car for perhaps 6 miles, then it died.

I am a lay person.

When stepping on the accelerator, there is short increase and fall in
hum frequency. This rise and fall in pitch will occur twice and then
remain at the base hum. If the battery pack is shut down and turned on
again with accelerator pressure, the above sequence in repeated.

Two gentlemen, employed respectively in fork lift repair and medical
X-ray equipment repair ( electrical engineering degree), have tested the
controller in the car and suspect the problem is with the power supply
transistor (functional block)

This a 3"X4"X1" black block located between the 3 contacters and the 3
blue capacitors. 

When the accelerator is pressed the voltage varies between 50 and 96
volts (8X 12). The main chip looks fine visually. (no burn marks). The
motor is fine. The controller was bypassed ; very dramatic !

I'm getting conflicting suggestions from local EV people , but none have
actually looked at the complete car. 

The students and teacher who converted the car originally are basically
not responding to requests for help.

Needless to say I would never recommend for anyone to buy a non -
operating highschool EV conversion without wiring diagrams.

Craig McCann from Pro Electric - Penn Valley California, quoted me a
price of @ $350 for this item. However, he recommended that the
controller be shipped to him for diagnosis .And said, that he is the
only one in the world  qualified to do this. Shipping there and back to
Toronto is $100 - UPS-and not insurable. I'm also concerned about
getting it back hassle free (re. Canada customs and the fact that it was
originally  a donation to the high school.

the # on the bottom (International Rectifier) I R  92 2014 4B12 9409
Electrosonic - Toronto says that this is not a part #  and I don't see
it listed on the
 
manufacturers website   www.irf.com  
               

For this kind of money I could buy a used controller or spend a little
more,buy new and get a warranty with manufacturers support.

I have entered this vehicle in 1 event already - Clean Air Cruise -and
have been asked to supply the car next week for a TV drama about an EV
company. 

I'm anxious to get this car operating again. It's getting tired to haul
and push this around and then not actually drive it.

Is anyone familiar with this controller or the symptoms that I have
described ?

Suggestions ?


Thanks in advance
David MacFadyen