I have a closed loop with 4 eductors run by the following:
Iwaki MX-250 with baldor 1/2 hp 230V 3-phase motor
Seimens 1/2 hp variable frequency drive with 200-240 volt single phase input and 3-phase output
repeat cycle timing relay, wired to the variable frequency drive. It automatically signals the vfd to "Ramp up" and "Ramp down" the pump rpm over time intervals of a few seconds to a few minutes. Ramp up-ramp down time is adjustable on the timing relay. This creates a wave surge every time the pump rpm peaks and then a quieter period as the pump rpm drops
Though the 1/2 hp pump is large it's only running at peak for 10 seconds and is off for 5 seconds between cycles. Current draw goes up and down with each ramp up and down. So the net draw is actually less than a DART. The result is very similar to ocean current that I have felt when diving
Iwaki MX-250 with baldor 1/2 hp 230V 3-phase motor
Seimens 1/2 hp variable frequency drive with 200-240 volt single phase input and 3-phase output
repeat cycle timing relay, wired to the variable frequency drive. It automatically signals the vfd to "Ramp up" and "Ramp down" the pump rpm over time intervals of a few seconds to a few minutes. Ramp up-ramp down time is adjustable on the timing relay. This creates a wave surge every time the pump rpm peaks and then a quieter period as the pump rpm drops
Though the 1/2 hp pump is large it's only running at peak for 10 seconds and is off for 5 seconds between cycles. Current draw goes up and down with each ramp up and down. So the net draw is actually less than a DART. The result is very similar to ocean current that I have felt when diving