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Hello Professional,

i have only high 1 X on a  603 HP / 1000 rpm Motor of a refiner

collecting data with 2 channel analyzer and measuring the relative phase:

-Drive side: Horizontal  0.43 in/s , Vertical  0.15 in/s, phase H to V 173 Deg

-NDS: Horizontal 0.55 in/s , Vertical 0.23 in/s , Phase H to V 176 Deg

-Phase across coupling after adding 180 is 40 Deg. ( in phase)

-Axial vibration  motor and refiner 0.043

-1X at Refiner is less than at the motor by around 0.07 in/sec  in H and V and Axial.


1-does the nearly 180 deg. phase shift between H & V mean Resonance ?

2-i do not know the source of the high 1x motor or refiner ?

3- i am confused: 180 phase shift could be the same effect as 0 shift ? (  for example in charlotte wall chart "eccentric rotor" comparative H an V phase differ either by 0 or 180 !!! ( 0 for me is in phase / 180 is out of phase drive moving up, driven moving down) , how in phase and out of phase confirm an Eccentric Rotor ?

4-why we do not make correction by adding +/-90 Deg when we measure phase between H & V ?? , sorry confused.


thank you in advance for your help.








Original Post

Thank you for reply

@John, phase shift is 40 deg.  (radial direction) on opposite sides of a coupling, that is why alignment for me is excluded.

-why in this case ??  a transducer will typically show 0Β° or 180 degrees phase shift, horizontal to vertical, at the same bearing.  and indicate what?

Resonance, i tried to bump the machine but it is very reaction




they checked the Alignment, it is within tolerance.

could be thermal unbalance ? or resonance ?.

still do not know why do i have 180 Deg H to V on the same bearing DE and NDE.

the whole machine sit on a massive Concrete base.

fburgos, it is a good idea, do u have an example for such checkerboard grid.

how can i simulate it (manually visualization) , i do not have ME' scope to do the. job. 

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