Owner manual

Brookfield Engineering Laboratories, Inc. Page 77 Manual No. M/98-211-A0701
APPENDIX H - Fault Diagnosis and Troubleshooting
Listed are some of the more common problems that you may encounter while using your rheometer.
❏ Spindle Does Not Rotate
✓ Make sure the rheometer is plugged in.
✓ Check the voltage rating on your rheometer (115V or 220V); it must match the wall voltage.
✓ Make sure the motor is ON and the desired rpm is selected.
❏ Spindle Wobbles When Rotating or Looks Bent
✓ Make sure the spindle is tightened securely to the rheometer coupling.
✓ Check the straightness of all other spindles; replace if bent.
✓ Inspect rheometer coupling and spindle coupling mating areas and threads for dirt; clean
threads on spindle coupling with a 3/56 left-hand tap.
✓ Inspect rheometer coupling threads for wear; if the threads are worn, the unit needs service
(see Appendix I). Check to see if spindles rotate eccentrically or wobble. There is an allow-
able runout of 1/32-inch in each direction (1/16-inch total) when measured from the bottom of
the spindle rotating in air.
✓ Check to see if the rheometer coupling appears bent; if so, the unit is in need of service (see
Appendix I, “How to Return Your Rheometer”).
If you continue to experience problems with your rheometer, follow this troubleshooting section to
help isolate potential problems.
❏ Perform an Oscillation Check
This check verifies the mechanical condition of the shaft and bearing assembly in the rheom-
eter. Auto zero the instrument according to directions in the manual. With the spindle re-
moved, motor off and the display showing % torque perform the oscillation check as follows:
1) Manually lift the spindle nut and rotate counter clockwise until the display shows 20%-
30% deflection.
2) Release the spindle nut.
3) The % display should return to 0.0% ±0.1%.