Retrofits of older motors, change from fix speed to variable speed, replacement of old VFD while keeping original motor – all that and more in this series.
What is the right strategy to retrofit fix-speed motor into VFD operation? As addressed in our previous post, a retrofit of a direct on-line (DOL) machine into VFD duty may be a very attractive choice [1]. This post focuses a bit on the practical aspects. What do I need to Read more…
Retrofits of DOL motors: Low-hanging fruit? Despite clear benefits of VFDs in motor drives, most industrial motors are still of fix-speed type. This is true for newly manufactured motors and even more for the installed base. Hence there is a huge potential for retrofits of fix-speed direct on-line (DOL) motors. Read more…