was the vibration data taken with the motor connected to the compressor? if so, at what loading/RLA?
Originally Posted by Taicool
the best open rotor test using vibration equipment is by measuring the dB of the current...see attached.
the main peak in the middle is the line frequency (60 Hz) and the large peak to the left is the rotor turning speed (57.469 Hz). the difference is about 32 dB. anything less than 45 dB indicates the beginning of a problem...<30 dB means that the motor is going to try to walk out of the door!
How to make the perfect "Half-Hitch" knot or any other boyscout knot in 3 easy steps...
1. Remove your meter leads from the meter and very carefully return them to their storage case or bag.
2. Wait 2 seconds
3. Very carefully remove your meter leads from their storage place and enjoy your new knot!