mech or elec vibration?
mech or elec vibration?
(OP)
Hello,
Hope you can help! our contractor has recently installed 110 off new motors on our water treatment plant aeration lanes, they are 15kw on outside lanes and 11kw further along, they are drving a spash paddle through a gearbox, i think they are weg motors, flender box's, our vibration worker was checking them today and was having kittens over what he was finding, He said they are all over the place and not consistent, The motors (switchable on/off) and driven through a single vsd for two motors, pfc is installed but i have not seen a harmonic filter. we have disconnected the drive and found that there is still some resonannce in the motor but not as severe as when coupled, could it be harmonics? i have inspected the electricals on the mcc and found consistantly in one area off the mcc a wire that seems to be hotter the the others across the phases, it's around 72 degrees others are 30degrees. some are causing real ground shudder around the motor, They will break up before long!!! good job we have not signed the off yet..any help please..
joe
Hope you can help! our contractor has recently installed 110 off new motors on our water treatment plant aeration lanes, they are 15kw on outside lanes and 11kw further along, they are drving a spash paddle through a gearbox, i think they are weg motors, flender box's, our vibration worker was checking them today and was having kittens over what he was finding, He said they are all over the place and not consistent, The motors (switchable on/off) and driven through a single vsd for two motors, pfc is installed but i have not seen a harmonic filter. we have disconnected the drive and found that there is still some resonannce in the motor but not as severe as when coupled, could it be harmonics? i have inspected the electricals on the mcc and found consistantly in one area off the mcc a wire that seems to be hotter the the others across the phases, it's around 72 degrees others are 30degrees. some are causing real ground shudder around the motor, They will break up before long!!! good job we have not signed the off yet..any help please..
joe





RE: mech or elec vibration?
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Eng-tips forums: The best place on the web for engineering discussions.
RE: mech or elec vibration?
=====================================
Eng-tips forums: The best place on the web for engineering discussions.
RE: mech or elec vibration?
Do you think a hot spot is causing motor vibrations? I guess it could cause unbalanced voltage and 2*LF, but wouldn't think the magnitude would be very high.
Regardless of the relationship to vibration, 72C rise on one phase with 30C rise on the others deserves to be investigated/corrected on its own regardless of relationship to vibration.
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Eng-tips forums: The best place on the web for engineering discussions.
RE: mech or elec vibration?
Very vague post. I suggest you delete it (you can Red Flag your own post and ask the mods to delete it) and then repost it with the vibration data along with other observations. "They were all over the place" doesn't cut it.
Muthu
www.edison.co.in
RE: mech or elec vibration?
Thanks for your help.
RE: mech or elec vibration?