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3.7 Vibration detection switch
The high speed rotating assembly of the 414 Centrifuge requires near perfect balance
for minimum vibration. Should an imbalance cause excessive vibration, the main
drive motor and fee pump will be shut off by a vibration detection switch, See (Item
223, Diagram 1). Excessive vibration is usually caused by a solids buildup within the
bowl or uneven bowl and /or conveyor wear. The vibration detection switch is
mounted on the centrifuge frame. Refer to Appendix for manufacturers information
on the vibration switch.
3.8 Fluid Coupling
Bring the large rotating assembly to operating speed would normally take the main
drive motor approximately 100 seconds. This would cause the motor to draw
excessive current, overheat conductors, trip thermal protectors or overload the power
plant. These problems are eliminated by a fluid coupling installed on the main drive
motor shaft. The fluid coupling allows the motor to attain speed almost immediately
while the bowl assembly is still accelerating. If excessive drag on the bowl causes
greater than normal slip, the heat generated will cause a fusible plug in the coupling
to melt. This will dump the hydraulic fluid in the coupling and unload the motor
before any damage can be done. See Appendix for manufacturers information on the
fluid coupling.
3.9 Electrical System
3.9.1 The electrical system on the 414 Centrifuge conforms to the National Electric
Code requirements for Class 1, Division 2, Group D.
3.9.2 The electrical system is shown in Diagram 11, Component Placement and
wiring Diagram 12 and Schematic in Diagram 14, Cabling is shown in
Diagram 13. These diagrams may be used to trace down individual
components or wiring circuits. The use of these diagrams will greatly
simplify trouble shooting electrical problems.
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