Specifications

Document No. DER05105
Effective Date 15 Jul 08
Supersedes 25 Feb 08
Page No. 1 of 16
TROUBLESHOOTING
DE-7200 CENTRIFUGE
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
Operating characteristics are continually monitored during centrifuge operation. Sensors are
installed in key areas of the centrifuge to detect performance and provide inputs to the PLC, which
responds by displaying real-time information on the operator’s screen. If warranted, the PLC alters
the feed rate or completely shuts down the equipment if pre-set limits on temperature, vibration,
conveyor torque, or bowl speed are exceeded.
Charts and illustrations are included in this section to aid in troubleshooting. The troubleshooting
chart describes mechanical failure modes, possible cause(s), and recommended course(s) of
action. Following this chart is a table containing definitions, causes, and corrective actions for alarm
and fault messages shown on the operator’s screen. Some of the fault isolation procedures require
electrical continuity testing, which should be performed only by trained, qualified personnel. Always
shut down, lock out, and tag out electric power to 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.
Further assistance for troubleshooting is provided by several illustrations that show and describe the
functions of status indicators on the variable frequency drives and other components inside the
control cabinet.
Schematic diagrams of ac-dc power distribution, analog sensor connections, and Ethernet
connections are included at the rear of this section for additional troubleshooting assistance. The
engineering schematic in Section 11 - Reference Drawings, supplier literature in Section 12 and
description and theory of operation in Section 1 provide further assistance in troubleshooting.