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Thanks a lot Frank. You helped me a lot in understanding this concept.
But for your information, the VSD that i normally use to control my air handling unit's motor, its maximum frequency is 50Hz only, following the incoming frequency. Why they don't use that frequency inverter that can ramp up...
Tq Frank for your explanation. But how to calculate the motor rpm, for example at 200 Hz since it can go to 500Hz maximum. Let says the motor rpm is 1450 (4 pole motor) at 50 Hz. Is it 200x1450/50 = 5800RPM?
---------- Post added at 07:49 ---------- Previous post was at 07:47 ----------
Sorry...
I refer to the variable refrigerant flow (VRF) system in air conditioning system. The DC inverter can ramp up to 90Hz. Can anybody explain to me how does it work? I thought we are using 50Hz supply, so the maximum limit can go also 50Hz?
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