Using variable speed drives (VSDs) to control pressure reduces the electrical energy requirements by reducing the amount of hydraulic energy actually produced. A basic pressure control pump station is equipped… Read more
Oct 03, 2015 | Edvard
Conveyor belts can have a lot of different looks and directions of use. It is a typical constant torque load with low to high braking torque depending on how heavy… Read more
Sep 07, 2015 | Edvard
To help estimate pumping energy costs: To compare different system and pumping equipment proposals and make an intelligent choice, three facts will need to be established: Will the process require varying… Read more
Aug 28, 2015 | Edvard
A soft starter is, as you would expect, a device which ensures a soft starting of a motor. A softstarter has different characteristics to the other starting methods. It has… Read more
Aug 12, 2015 | Edvard
The main purpose of commissioning VSDs is to ensure that: The AC converter and motor have been correctly installed and meet the wiring and safety standards such as IEC 60364… Read more
Apr 22, 2015 | Edvard
It is often desirable to control the motor speed, usually for reasons process control for such variables as flow or pressure. Such applications as fans and pumps often have varying… Read more
Mar 13, 2015 | Edvard
Medium voltage drives have been available for over 35 years, but have only recently achieved very high reliability and simplicity within the past few years. Below are 10 considerations on… Read more
Sep 17, 2014 | Craig Hartman
A rotodynamic pump is a dynamic device with the head generated by a rotating impeller. Thus, there is a relationship between impeller peripheral velocity and generated head. Peripheral velocity is… Read more
May 09, 2014 | Edvard
A steel mill with variable speed drives (VSDs) had problems of frequent tripping of the VSDs with the indication overvoltage in AC line. Each tripping caused severe production disruption and… Read more
Feb 12, 2014 | Edvard
When a motor is connected to a frequency converter it must be kept at the correct temperature, and this is subject to two types of influence: If the speed decreases,… Read more
Jul 05, 2013 | Edvard
