What are some of the mistakes end users make with variable-speed drives that lead to lower productivity? Tom/Automation Direct: Many end users fail to post a schematic in the panel or near the drive.

This short video from [ProShorts 101] shows us how to build a variable speed disc sander from not much more than an old hard drive. We feel that as far as hacks go this one ticks all the boxes.

Switches V1 to V6 in the inverter are very fast semiconductors, usually insulated gate bipolar transistors (IGBTs) in modern drives. Fig. 4. Schematic of a variable speed AC drive. The output may have ...