Hi all, I have been lurking on these forums for a while now, and now have a valid tech question. I look after 12 TCM FB15-7 trucks with AC drive motors. One truck has blown two inverters, one about two months ago, and the other this week(controller has 3 seperate inverters). I have had the motor out and tested but it came back with a clean bill of health, does anyone have any ideas, as its costing £3,500 each time this happens!
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I have had the motor stripped and inspected with no faults found. The truck is 48v,controller has a current limit of 394A. I do suspect the operators are pushing the loads instead of lifting, but I would have liked to see heat damage in the motor? I look after a fleet of 12, all in the same place, but its only this machine thats failing (so far!)
check the temperature sensors
make sure the operators are not operating them in a manner that will overheat them (such as pushing loads on the ground)
check the brake adjustments and make sure they arnt binding
make sure they are charging the machine properly (low volts = high amps and can damage circuits)
i see youre in the uk so im assuming they are 36 volt or higher
if they are 24 volts some ac inverters have overheating issues at this low of a voltage (we sell em cause americans like 24 volts mainly because of cost savings upfront.. we make alot of money from decisions made solely on upfront cost savings lol)
check for shorts and make sure all spike suppressors are working and installed (on horns fans relays etc)
"have a good luck"
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