Electrical driver start/stop
Electrical driver start/stop
(OP)
hello,
according to the sequence of operation a pump with a 1HP electrical motor starts every 7 minutes for 2 minutes and stops for another 7 min and so on.
can the electrical motor be started and stopped for such a mode of operation? is there any recommendation for the maximal start/stop per aperiod of time?
regards,
roker
according to the sequence of operation a pump with a 1HP electrical motor starts every 7 minutes for 2 minutes and stops for another 7 min and so on.
can the electrical motor be started and stopped for such a mode of operation? is there any recommendation for the maximal start/stop per aperiod of time?
regards,
roker





RE: Electrical driver start/stop
Gunnar Englund
www.gke.org
RE: Electrical driver start/stop
We run 1hp centrifugal milk pumps which cycle on and off 2 to 3 times a minute for 6 or 7 hours 2 times a day. With the modifications described above they are very reliable and last for many years with only occasional capacitor and switch problems.
We also have a PSC design pump motor which eliminates the switch and is even more reliable. Lightning from thunder storms causes capacitor failure occasionally on those.
Jim
RE: Electrical driver start/stop
Starting limits are defined in NEMA MG1 standards for American motors.
For 1 HP application the more economical solution is that described. Consider the motor life expectancy between 2 to 3 years, replace it with a new motor when it will fail.
For large HP motors the described starting-stopping cycle should be avoided in spite of driving a light inertia pump.