Setting Up The Bently Equipment
NOTE: For more information look in the top left-hand drawer to find manuals
for the Bently equipment, the Oscilloscope Interface, and the oscilloscopes.
|The rotation direction, X axis, and Y axis are defined as viewed by the driver (motor) to the driven (shaft). The rotation direction can be confirmed by checking the CW/CCW switch on the back of the Speed Control. The system should be set up to rotate in the CCW direction.|
|The X and Y axis are defined as follows...|
|NOTE: The scopes will slowly wander so be sure to recenter occasionally|
|Aligning the Mass|
|IMPORTANT:Before the Rotor Kit can be run through resonance the shaft must be straightened. This can be done by running the Rotor Kit at slow roll and using the ADRE software to determine the deflection, and then physically bending the shaft straight. The slow roll shaft deflection must be in the range of 0.5 to 0.7 mils peak-to-peak (mils pp) BEFORE running through resonance to assure that the shaft bow will not contact the probes.|
|NOTE: 1 mils = 1 thousandths of an inch|
|Slow Roll Balancing Technique:|
|1.||Power up the computer and Bently equipment|
|2.||Click on "ADRE for Windows" icon|
|3.||File -> Open -> Adrewin\database\single -> Ok|
|4.||Run the Rotor Kit at Slow Roll|
|5.||Click on Store Enable|
|6.||Read values for 1X: Amplitude = ...... Phase Angle = ......|
|7.||Stop Rotor Kit|
When the Rotor Kit is stopped the ADRE software will give a "Keyphasor Error"
When you start the Rotor Kit again, click on the "Clear Error" button.
|8.||Rotate mass until the phase angle from step #6 lines up with the Keyphasor probe|
|9.||Push down vertically to straighten the shaft. This will require some practice. If not enough force is applied the shaft will not be fully straightened. If too much force is applied then the shaft will be bent in the opposite direction.|
|10.||Run the Rotor Kit at
Slow Roll and read the new values for 1X: |
Amplitude = ...... Phase Angle = ......
|11.||If the amplitude increases after bending at approximately the same phase angle, then stop the Rotor Kit and rotate the mass until the phase angle is 180 degrees away from the keyphasor probe and apply force.|
|12.||Repeat steps 7-11 until the shaft bow is 0.5 -> 0.7 mill pp|
|Now the system (without any balancing weights) should be capable of running through resonance without contacting the probes.|