Using an Uninterruptible Power Supply to Feed a Variable-Speed Drive

Le résumé fourni par la source

This chapter presents a variable-frequency drive connected to a motor driving a fan. The fan is ventilating a building with air flow that is essential to a process within the building. With loss of normal building power, the process is interrupted, but air flow must be maintained for 20 min longer during the power outage. This flow purges the process of gases that could otherwise accumulate and become explosive. Only 40% flow, reduced from full normal, is required. Because there is no backup generator, the variable-frequency drive is switched to an uninterruptable power supply having a 20-min battery. It may be uncommon to find an uninterruptable power supply feeding a drive that supplies a fan. However, this application is necessary where power interruption cannot be tolerated, or where a backup generator isn’t available, or where power quality is poor. This discussion focuses on sizing an uninterruptible power supply (UPS) to power a variable-frequency drive (VFD), which drives a motor and its fan load.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.