I want to perform a single phase test on a 500HP 480VAC 3550RPM twelve tap star/delta motor in order to check the condition of the squirrel cage rotor.
I have a 15KVA three phase delta/delta step down transformer for 480VAC to 240VAC. The delta secondary has a center tap (stinger leg). I...
We have some new equipment that is using 12VAC relays powered by 16.5VAC. This is over 30% designed coil voltage. The relays are all hot. The wiring matches the drawing. Is this in the range of voltage tolerance? I searched the internet but was unsuccessful to find the answer so here I am where...
Not too long ago we had a star-delta motor controller blow apart but did not hurt the motor, at least from megging and ohms measurements. I read this forum with enthusiasm and followed your collective advise and asked the boss to order a soft start. He ordered a soft start controller to handle...
I hope somebody may have ran into this problem in the past. The electrical side of the compressor is in good shape. The compressor motor experiences higher than normal inertial load during start. During run the motor is working 10% harder than it should. I suspect something with the slide valve...
I am wiring up a 500HP star/delta motor but the motor taps for 5 and 2 are missing. Question: Is there any danger to normally wire up the motor and use either tap 5 or 2 and start the "uncoupled" motor in star only and check for bad current unbalance? If there is a bad current unbalance, then...
