Brookfield DV-III Rheometer - Manual (Page 62)

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APPENDIX I - Fault Diagnosis and Troubleshooting
A diagnostics option (Option 5) was supplied on DV-III Rheometers with firmware versions up to 2.0.
It checks all DV-III electronic components: circuit boards, serial interface, motor control, display and
keyboard. This option is used when a malfunction is suspected. Pressing the number 5 key from the
Options screen begins the test sequence with instructions provided on the screen.
On DV-III Rheometers with Version 3.0, the diagnostics routines may be executed by holding the
SELECT DISP key when the rheometer power switch is turned on.
The necessary instructions are given via “on screen” instructions with one exception. When the
Keyboard test is run, the operator must press every key on the control panel.
Note that the Transducer Alignment section of the program is used by authorized Brookfield service
technicians, and is not used in normal circumstances. The procedure for activating Diagnostics from the
main screen is:
1) Press the OPTION key.
2) Press the number 5 key.
3) Follow the instructions on the screen.
Listed are some of the more common problems that you may encounter while using your Rheometer.
Spindle Rotates Eccentrically
1. Spindle not screwed securely to coupling
• Tighten
2. Dirt in spindle or Rheometer coupling
• Clean
3. Bent spindle
• Check other spindles - replace any that are bent
• If all rotate eccentrically, contact Brookfield Engineering Laboratories, Inc. or your
Brookfield dealer for repair
Note: Maximum permissible runout is 1/16 inch (1.6 mm) at end of spindle.
4. Spindle coupling bent
• Contact Brookfield Engineering Laboratories, Inc. or your Brookfield dealer for repair
No Display Reading
1. Underrange “—” (in cP or SS) when % torque is below zero
• Change spindle and/or speed
• Perform an Auto Zero