I have question for someone more familiar with AC Motors/VFDs than I. We are using a VFD to drive an AC motor for a Rotary UPS...I noticed if the drive loses the 0mA reference signal (0-20mA control loop) while the drive is running, it automatically "brakes" the motor...I am assuming this is a...
All,
Due to previous bearing incidents on some rotating machinery we have installed, our customer has requested we monitor harmonics on the LOAD side of the VFD that feeds our equipment (in addition to temperature and vibration analysis which we already do). They have been completely convinced...
Guys,
I have a question for anyone with UL expertise. I am modifying a IEC based switchboard design to pass UL891 here in the States. The IEC design allows multiple Mini-Circuit Breakers (UL 1077 "supplementary protective devices") to be tapped downstream of our incoming Utlity/Genset breakers...
