Do I need Braking resistor with VFD?
My application is:
5hp 3 phase induction motor (440vac) driven by 5hp VFD.
Motor drives hydraulic pump
Oil flow additionally controlled by valve installed after the pump.
When motor commanded to stop simultaneously valve closes.
Increase of oil pressure is limited by overload valve.
My 'speculative assumption' is: energy buildup when motor stops/valve closes is being dissipated through oil pressure increase. System inertia is 0 (can it be 0?) since pump can not rotate.
And as conclusion I do not need Brake resistor.
Yet I am not an expert, have minimal experience with VFD … would like to get an opinion.
My application is:
5hp 3 phase induction motor (440vac) driven by 5hp VFD.
Motor drives hydraulic pump
Oil flow additionally controlled by valve installed after the pump.
When motor commanded to stop simultaneously valve closes.
Increase of oil pressure is limited by overload valve.
My 'speculative assumption' is: energy buildup when motor stops/valve closes is being dissipated through oil pressure increase. System inertia is 0 (can it be 0?) since pump can not rotate.
And as conclusion I do not need Brake resistor.
Yet I am not an expert, have minimal experience with VFD … would like to get an opinion.