Advanced motor protective relays provide superior protection for motors and pumps. pump system optimization
Last month, we ended with a discussion of the relationship between peak and RMS (or effective) voltage.
Following the development of variable frequency converter drives during the 1990s, totally enclosed fan-cooled (TEFC) AC induction motors became viable options for replacing DC motors in pumping applications.
With highly reliable electrical systems, protective relays may be called upon to operate very infrequently.
It has been said that Washington, D.C., is the home of the largest invertebrate population in the U.S.
Because operational costs ride on efficiency determinations, accurate measurements of losses occurring within the motor are paramount. The reliability of efficiency data is key to any energy-savings plan, and knowing the meaning behind the rating can make or break a smart purchasing decision.
Proper alignment of the pump shaft with the driver can reduce vibration and significantly improve reliability.
A flexible coupling's primary functions are connecting two shafts, transmitting power from a driver shaft to a driven shaft and accommodating the misalignment between them.
Couplings are often forgotten until a project is nearing its end.
A large wastewater processing plant experienced continual problems with its influent raw wastewater pumps for several years.
In the past year, the rate of acceleration in the cost of raw materials (including steel, iron ore, copper and aluminum) has reached unprecedented levels in the pump and rotating equipment industries.
Bigger is better — or at least it used to be
For the first time, the United States Department of Energy (DOE) adopted energy conservation standards for small electric motors in February 2010.
The SI system is the modern day version of the metric system, and the U.S. gets a lot of grief for not embracing its inherent transportability across international boundaries.
Owing partly to tradition, the shafts of electric motors are often larger than those of the equipment they drive.
A paper or an electronic work order system can be used to capture alignment data.
Significant energy and money savings are realized when using variable speed motors controlled with drives.
This three part primer is a basic introduction to AC power for those in the pump industry who need a place to start. It will also provide several web references to access if you would like to further your understanding of this interesting and essential topic.
Mechanical resonance occurs when an external source amplifies the vibration level of a mass or structure at its natural frequency.
It is impossible to balance line-to-line voltages perfectly in a three-phase circuit.