Drucker Diagnostics QBC Horizon 755VES Centrifuge (120V, 60Hz) - Manual (Page 16)

4.3 TUBE LOADING AND BALANCING (continued)
Before closing the lid, INSTALL THE ROTOR
COVER. To secure the cover, turn the cover
knob
clockwise onto the motor shaft
(Figure 4-4). Continue turning the knob until
the cover is snug. DO NOT OVERTIGHTEN.
4.4 EMERGENCY UNLATCHING OF LID
An electric interlock prevents the operator from manually opening the centrifuge lid once it is closed and latched.
In case the latched lid must be opened, and the cover was installed over the rotor, press the ON/OFF button
twice to start and stop the Centrifuge. The lid will then open.
In case the latched lid must be opened, but the rotor cover was inadvertently left off, DO NOT attempt to start
and stop the centrifuge with the ON/OFF button; instead, unplug the Power Pack and wait for the yellow LED to
turn off. Plug the Power Pack back in. This will disengage the electric latch interlock and cause the lid to open.
Note: For procedures on opening the lid in the event that main power to the centrifuge is lost through a fuse or
main electrical failure, see Section 9.3.
4.5 SPEED/POWER LED MONITORS
The yellow ‘POWER’ and green ‘SPEED’ LED lights are used for monitoring the status of the centrifuge. When
both lights are on steadily, the centrifuge is at design speed (12,000 ± 80 rpm). When the yellow light is on steadily
but the green light is flashing, the centrifuge is below (but accelerating to) design speed; and when both lights are
flashing the unit is above design speed. If speed exceeds 14,800 rpm, the centrifuge will automatically shut down.
A detailed table of LED Status Indicators is presented in Section 9.5, TROUBLESHOOTING.
CAUTION
NEVER ATTEMPT TO CENTRIFUGE
QBC TUBES UNLESS THE COVER
IS INSTALLED OVER THE ROTOR,
SINCE TUBE BREAKAGE AND LOSS
OF SAMPLE WILL OCCUR.
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Figure 4-4. Tightening Knob of Rotor Cover.