After a 4 hr. run test of an uncoupled motor that is rated 600 HP, 480 VAC, 60 hz. what should the amp. reading not be more than?
What should it be after 6 hr. run test?
And after 8 hr?
system start-up
Sep 25, 2004
4 Replies
something under FLC I would guess.
I would guess the readings would be about the same for all three cases.
about same for all times. However, you have omitted the kind of motor and its class so any value for no -load current is a guess. If it is an induction motor- no load current will be in the neighborhood of half the rated current. If you are getting something near full load current -run- don't walk- to get the nearest technician.
You've omitted some info, but 'uncoupled' means completely unloaded. This is not a valid 'run test' for any motor. You might as well just shut it down after 20 minutes. It isn't going to be up to rated temperatures. Current will be the 'unloaded' value (
im an electrician and these were questions (this and the hypot question) on an ISO certification test. i didnt design the test im just seeing what this group thought. i agree that running a motor test for so long serves no purpose.
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required