The thermal environment of a control panel is an important factor in the application of industrial components and devices. High temperatures present safety concerns, influence performance, and affect the overall product reliability. High temperature accelerated life testing is frequently used by manufacturers to simulate product life aging. Using an Arrhenius type equation has lead […]
ABB has published a booklet to help users select the most appropriate ac variable speed drive for their application. Curiously called the ABB micro drives : Drive dimensioning guide, the twelve page guide explains the impact of varying application and environmental considerations that affect a drive’s performance. Selecting (dimensioning) the drive correctly […]
What are harmonics? Harmonic distortion is a form of electrical pollution that can cause problems if the sum of the harmonic currents increases above certain limits. A harmonic current is one with a frequency at a multiple of the fundamental frequency, for instance a 250 Hz current on a 50 Hz network is the […]
A load-sharing application is one where there are two or more motors mechanically connected to drive the same load. In this application a Mitsubishi FR-A700 sensorless vector drive is controlling a long conveyor belt. In theory, if there are multiple motors that are all supplied by the same frequency, they will all output the same […]
GAMBICA has published an updated version of their free guide to the requirements of BS EN 61439-1:2011 & BS EN 61439-2:2011. The guide has been compiled by members of the GAMBICA Controlgear Group Technical Committee. Power Switchgear and Controlgear Assemblies It is intended provide specifiers, designers and purchasers of Power Switchgear and Controlgear […]