Inverter Duty Motor
Inverter Duty Motor
(OP)
If we specify inverter duty motor, do we sill need line reactor /filter on VFD output provided voltage spike does not exceed NEMA-MG- 31 limit?
I tend to be more cautious about this. Normally I ask for the load recator as a minimum requirements. Because most LV motors are designed for inverter duty as well.
If the added costs for load reactor-filter are not that high, I would add them for most of application.
Any inputs would be appreciated.
I tend to be more cautious about this. Normally I ask for the load recator as a minimum requirements. Because most LV motors are designed for inverter duty as well.
If the added costs for load reactor-filter are not that high, I would add them for most of application.
Any inputs would be appreciated.





RE: Inverter Duty Motor
As to adding a reactor in the motor leads, they are inexpensive filters to buy but they also drop voltage. In fact, a 5% reactor will drop 5% of its source side voltage when operating at nameplate current. Before buying that reactor, you should check to see if you have enough voltage for the motor at full load and full speed.
RE: Inverter Duty Motor
As far as needing additional filtering or reactor in this application, it depends on other factors, like cable length and type as well as how critical the process is. A reactor or dv/dt filter can be cheal insurance for a mission critical application.
Neil