Cannon Instrument CT-2000 (Contant Temperature Bath) - Manual (Page 33)

CANNON ® CT-2000 Constant Temperature Bath
Revision 1.0g—February, 2012; CANNON ® Instrument Company
2139 High Tech Road • State College, PA 16803 • USA
31
CHAPTER
B
APPENDIX B
—
CORRECTING
SHAFT & IMPELLER
MISALIGNMENT
Motor-stirrer units supplied by CANNON ® Instrument Company are
checked after assembly to ensure minimum run-out (deviation from
concentric rotation) at the impeller end of the shaft. The following
instructions are intended to assist those who may be experiencing exces-
sive vibration in the motor-stirrer because of shaft run-out or misalign-
ment of the impeller blades.
Set Screw Alignment The motor shaft contains a flat area. The coupling should be oriented in such
a way that the set screw is aligned with the flat. The stirrer shaft and motor
shaft should be inserted to approximately the same length in the coupling.
You can test for shaft run-out and impeller blade alignment by placing
the motor on a soft surface with impeller facing up.
Connect the motor to the appropriate AC power source and observe the
impeller and shaft. If run-out is severe, the motor will vibrate and the
shaft will flutter noticeably. The impeller will appear blurred if the
impeller blades are not in the same plane.
If necessary, adjust the impeller blades by bending the large horizontal
sections of each of the four segments so that they lie in the same plane.
Since these segments are easily bent, check alignment whenever the
impeller is bumped, or if there is any suspicion that the blade segments
may have become misaligned.
Shaft run-out correction
The following procedure is suggested to correct shaft run-out:
1. Remove the motor-stirrer from the CT-2000 bath.
2. Grasp the motor firmly with the left hand.