Thanks dpc. Will investigate the time delay angle. Currently, we are limiting operators to stopping the fan for two minutes, then restarting them in the other speed. Yet the fans, which are safety grade equipment, will auto-shift to slow on an accident signal, so they should be robust enough to...
Hi,
My facility has several two-speed squirrel cage induction motor fans that have occasionally tripped on thermal overload during shifts from fast speed to slow speed, and once from slow speed to fast speed.
I am trying to determine the starting/in-rush current during the three modes...
