Beckman Coulter Allegra 6 Series, Instruction Manual

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4-2
Troubleshooting
OTHER POSSIBLE PROBLEMS
Possible malfunctions not indicated by diagnostic messages are
described in Table 4-2, along with probable causes and corrective
actions required. Possible causes for each problem are listed in the
probable order of occurrence. If you are unable to correct the
problem, call Beckman Coulter Field Service.
Table 4-1. Shutdown/No-Start Diagnostics
Probable Cause Recommended Action
Imbalance detector
tripped 1. Turn the TIME knob to OFF and press the POWER switch to OFF (O).
2. Check to be sure the rotor is in good condition and is loaded symmetrically
around the center of rotation, with containers of equal weight and density
opposite each other.
NOTE
If you are using a swinging bucket rotor, fill all yoke positions with buckets and/
or carriers. Always run the rotor with a balanced load (refer to the applicable
rotor manual for complete loading information).
3. Be sure the rubber boot is undamaged and is seated correctly over the dust cover.
4. After a 30-second delay, press the POWER switch to ON (I) to reset the imbalance
detector circuit. You should be able to restart the run normally.
NOTE
It is possible to trip the imbalance detector switch during rotor installation or
loading. Performing these actions with the power off will avoid the problem. If
the imbalance switch is tripped, however, turn power to the centrifuge off, then
back on to reset the circuit.
Thermal cutoff switch
activated 1. Turn the TIME knob to OFF and press the POWER switch to OFF (O).
2. Check that ambient temperature is within the limits shown under
SPECIFICATIONS
in Section 1.
3. Check for air inlet obstruction and dirty air-inlet filters. Clean as required (see
Section 5, Care and Maintenance).
4. After the motor has cooled (approximately 15 minutes with the door open), press the
POWER switch to ON (I) to reset the thermal protector circuit. If the problem per-
sists, call Beckman Coulter Field Service.
Chamber over-
temperature
(refrigerated models
only) 1. Turn the TIME knob to OFF and press the POWER switch to OFF (O).
2. Check that ambient temperature is within the limits shown under
SPECIFICATIONS
in Section 1.
3. Check for air inlet obstruction and dirty air-inlet filter. Clean as required (see
Section 5, Care and Maintenance).
4. Check chamber temperature; if it is overtemperature , call Beckman Coulter Field
Service.
Tachometer signal loss Call Beckman Coulter Field Service.
Probable Cause