BlackOilsandBitumen
Chemical
Hi Guys,
In the very early stages of looking at a VSD for a PD gear pump and my knowledge is purely theoretical (and limited). Basically what is the practical frequency range I can operate a electric motor at to get my flowrates.
Normal supply is 415V 50Hz. Motor is 4 pole. so approx 1500RPM. Pump is PD so flow vs speed is approx linear and insensitive of backpressure.
I have heard that if you back the speed off to far the motor can overheat as the cooling fan is on the shaft.
I would operate say 70% of the time at 46Hz (1380 RPM), 25% of the time at 58Hz (1740 RPM) and 5% of the time at the lowest practical speed (?) for 2 min intervals.
Any guidance on what frequency I could spec the low speed at?
In the very early stages of looking at a VSD for a PD gear pump and my knowledge is purely theoretical (and limited). Basically what is the practical frequency range I can operate a electric motor at to get my flowrates.
Normal supply is 415V 50Hz. Motor is 4 pole. so approx 1500RPM. Pump is PD so flow vs speed is approx linear and insensitive of backpressure.
I have heard that if you back the speed off to far the motor can overheat as the cooling fan is on the shaft.
I would operate say 70% of the time at 46Hz (1380 RPM), 25% of the time at 58Hz (1740 RPM) and 5% of the time at the lowest practical speed (?) for 2 min intervals.
Any guidance on what frequency I could spec the low speed at?