OPERATION
21
5. OPERATION
5.1 Run Procedure
Ensure that the Rotor is correctly loaded and secured and the Timer set at Off.
Close the lid and press down firmly. Press the Power switch on. The Power On
and the Lid Unlocked indicators will come on.
Select Timer to Hold, for continuous running, or to the time required. The lid will
now be locked - Lid Unlocked indicator off.
Select required speed (between 300 rev/min and the maximum speed of the rotor
in use, see section 4.5) by adjusting the Speed control until the required speed is
indicated on the Rev/min digital display. For repeat runs the Speed control need
not be moved from the position originally selected.
5.2 Stop Procedure
To terminate a run in the Hold mode, set the Timer switch to off and the rotor will
run down smoothly to a stop. In the Time mode the centrifuge will run down
automatically when the selected time has run out. In both modes automatic
braking is applied, and when the rotor has stopped, the Lid unlocked indicator will
come on. Open the lid; the Lid unlocked indicator will go off.
5.3 Imbalance
Should the imbalance indicator lamp come on, the centrifuge will run down. When
the digital panel meter indicates four zero’s, turn the Power switch and Timer to off
and wait thirty seconds, then turn the Power switch on. The lid unlocked indicator
will come on; open the lid; check the balance of the rotor; close the lid and restart
the run.
5.4 Motor Thermal Cut-out
The motor is fitted with a ‘self re-setting’ thermal cut-out to protect the motor from
over-heating. If the thermal cut-out has operated during a run the rotor will stop
and ‘0000’ will be displayed. The centrifuge will return to normal operation once
the motor has cooled.
IMPORTANT: ENSURE THAT THE VENTILATION SLOTS AT THE BACK ARE
NOT OBSTRUCTED IN ANY WAY.
5.5 Power Failure
If the mains power to the centrifuge is interrupted during a run, the rotor will coast
down to a stop and the lid will remain locked. Turn the Timer control to off.
When the power is restored, re-start the run as normal. If it is required to gain
access to the rotor during the power failure, use the Lid Lock Release Key (see
section 2.3).
If power failure occurs and the centrifuge is left unattended, subsequent
restoration of power will cause the centrifuge, if in the Hold mode, to run up to the
originally selected speed. If in the Time mode, the centrifuge will run up to speed
and continue for the time left on the Timer. If the selected time runs out during the
power failure, the lid will remain locked for an inherent delay period of
approximately 3½ minutes from the time of power failure, even if the power is
restored within this period.
