Typically when we repair something, we return it to the manufacturer’s specifications. But if the equipment failed, perhaps the manufacturer’s specifications don’t fit the application. When making repairs, do you even ask this question?
Consider a 30 hp motor that drives a production machine and must be replaced every nine to twelve months. It always gets an exact replacement. What is the typical mode of failure? If heat-related, perhaps a motor with a higher heat rating will last for decades in that same application.
Perhaps the motor is not quite “torquey” enough. A simple gearbox replacement can solve that problem.
What if the motor starts across-the-line? If that’s the case, probably a couple of things are going on. First, that kind of start is much harsher on motors than the soft start made possible with a variable frequency drive (VFD). And if that VFD is power factor corrected, it will solve a second problem that’s common with motors.
Some issues, like the aforementioned, are well within maintenance capability to correct. Other issues require a conversation with the manufacturer.
