I have a conveyor belt application using 2 mechanically coupled 500HP motors with 2 VFD's (VFD1 and 2) and one 500HP motor/VFD (lets call it VFD3). They are setup as master/followers. VFD1 is the master. It takes a speed set point and in turn sends the required torque to VFD2 and 3. The conveyor will often be called upon to carry more material than the initial design. On some occasions, the VFD's will source more than nameplate amps (motors are 563 FLA). Sometimes as high as 650A for very short durations due to material load only. What do I need to consider if the VFD's are current limited to 600A? Would stall really the only thing to consider?
This is a hypothetical situation and not sure why you would do this given I can program the VFD for motor OL protection but is more a question for my own knowledge.
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