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Another possibility is this:
When the Victor tells a motor to stop, the motor, in its obstinate way complains, "I can't, I got this stupid robot on my back, but I'll try." The motor continues to generate current (Lenz' law), sending it through the Victor's FETs in a loop. This loop is independent of the upstream fusing, occuring between motor and Victor only.
IFI used to have a paper that 'bragged' about a spike of 300 A being handled by a Victor (883), when subjected to full forward, , accelerate to speed, arrrgh...no!!!!, full reverse.
Perhaps you were in brake mode, which would make it more likely.
As Al says, this could be normal mortality. I suggest you talk to IFI about it. They may replace it.
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After reading AL's last again, I must caution against drilling Aluminum over Victors. Once the controls are mounted, all machining must be done in another room, even another country, as Aluminum has an affinity for the circuit board material in Victors, and will easily swerve 20 feet to the side in falling 3 feet to the floor.
To quote a Rudyard Kipling phrase, it is due to "The Heartbreaking Perversity of Inanimate Things".
Last edited by Lloyd Burns : 31-01-2003 at 09:28.
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