Drucker Diagnostics Model 755 Centrifuge - Manual (Page 17)

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Safety:
Horizon Lid Safety Switch: The Horizon lid is secured to the top of the
cabinet by a latching knob and pawl system. When the knob is rotated
clockwise, the pawl grips the underside of the cabinet opening and prevents
the lid from opening. A mechanical stop positions the pawl and prevents it
from rotating completely. When rotated to the stop position, the pawl makes
contact with a micro-switch mounted underneath the cabinet top. The lid
safety switch prevents the centrifuge from operating while the lid is open.
An indicator light on the front of the machine will light up when the lid has
been latched properly.
Horizon Lid Safety Interlock System: In addition to the Lid Safety Switch,
the Horizon has a true “0 RPM” lid locking system. The lid safety interlock
system keeps the lid locked at all times (even during power failure) and
requires that the rotor be at rest in order to unlock the lid. The centrifuge will
not allow entry into the rotor chamber unless the centrifuge has power and the
rotor is stopped. To open the lid, make sure that the centrifuge is plugged in
and, with the rotor stopped, press the ‘OPEN / EMERGENCY STOP’ button.
Note: After the centrifuge has started spinning, it may be possible to rotate
the lid knob enough to cause the pawl to lose contact with the lid safety
switch. If this happens, the centrifuge motor may lose power, but the lid
will still remain locked. If the knob is accidentally moved and this situation
should occur, rotate the knob fully clockwise to its stop position and the
centrifuge will resume operation after a few seconds.
Circuit Breaker: The Horizon is protected with a 4 Amp circuit breaker
located at the rear of the machine mounted to the base. Any electrical short
circuit will cause the breaker to cut power to the machine.
Imbalance Detection System: In the event that an imbalanced load is spun
in this centrifuge, the run will be aborted. A continuous, two-count flash of the
run and latch indicator lights signals that an imbalance was detected. Once the
centrifuge has safely come to a complete stop and unlocked, press the OPEN
button or open the lid to reset fault. Correct the imbalance before proceeding.
Emergency Rotor Chamber Entry:
In the event of power failure, it may be impossible
to unlock the lid by conventional means. In this
case, entry into the rotor chamber may be made
by removing the latch label and using a pen to
manually disengage the locking mechanism (see
photo). Pull the mechanism towards the control
panel and then unlatch and open the lid. If the
unit is damaged, contact your authorized dealer
or The Drucker Company.
The Horizon model 755 complies with all requirements of UL standard
61010A-1, 61010A-2-20; Can/CSA C22.2 No’s 1010.1; 1010.2.20.