Specifications

Document No. DER05103
Effective Date 25 May 07
Page No. 1 of 5
TROUBLESHOOTING
DE-1000 CENTRIFUGE - GEARBOX DRIVE
GENERAL
Although equipment failure is unlikely, malfunctions due to operating error or other problem can
result in unnecessary machine down-time and should be corrected as soon as possible. The
troubleshooting procedures presented in this section will assist technicians in isolating and
correcting malfunctions.
TROUBLESHOOTING PROCEDURE
Fault analysis should proceed logically from the simplest cause to the more complex. The most
difficult problem is an unexpected shutdown or inability to start. Always eliminate obvious causes of
malfunction before proceeding to more complex possibilities.
Since more than one cause may be responsible for a malfunction, the technician must proceed
methodically to eliminate all possible causes and take all corrective actions at each step of the
troubleshooting process. Where changes to operating procedures are the best course of action,
appropriate recommendations are included.
In general, an unexpected centrifuge shutdown is due to an interruption of electric power that has
turned off the 50 HP drive motor. Safety components are installed in key areas of the centrifuge
electrical control system to shut down the electric motor if safety parameters such as motor
temperature, vibration, or conveyor torque are exceeded. The power interruption may be due to one
or more factors, including a local power failure.
The troubleshooting chart consists of failure modes, possible cause(s), and recommended
course(s) of action. All electrical continuity checks in this procedure are performed without electric
power supplied to the centrifuge. Lock out and tag out equipment before attempting to perform any
continuity check.
WARNING! CONTINUITY CHECKS MUST BE PERFORMED WITHOUT
ELECTRIC POWER APPLIED TO CENTRIFUGE. LOCK OUT AND TAG OUT
ELECTRIC POWER BEFORE ATTEMPTING CONTINUITY CHECKS.
In addition to the troubleshooting chart, the technician should refer to the appropriate schematic and
wiring diagrams in Section 11 - Reference Drawings, and description and theory of operation in
Section 1 for additional assistance in troubleshooting.