Specifications

Document No. DER05105 TROUBLESHOOTING
Page 2 of 16 Effective Date 15 Jul 08
TROUBLESHOOTING DE-7200 CENTRIFUGE
Possible Cause Isolation Procedure & Corrective Action
Failure Mode 1: Acceptable liquid, Cake Too Thin
Increase feed rate.
Increase weir opening (refer to DER04098).
Insufficient solids in feed
Reduce differential speed.
Increase feed rate.
Check feed pump; if required, check wear and replace worn
parts.
Check pump shaft seal, and correct any defects.
Drop in feed pump rate
Select RESET on Fault Reset screen to reset flow rate.
Failure Mode 2: Poor Liquid Quality, Acceptable Cake
Increase bowl speed. Bowl speed too low
Reduce feed rate.
Excessive amount of solids in
feed
Reduce quantity of solids in feed or add dilution stream if
possible.
Change in feed characteristics Reduce quantity of solids in feed or generally optimize
machines settings, i.e. adjust bowl speed, differential speed,
and weir opening.
Re-optimize machine settings.
Reduce feed rate.
Increase weir opening (refer to DER04098).
Increase in solids wetness
Reduce differential speed.
Conveyor flights worn
excessively. Inspect flights
through the solids discharge
outlets
Remove and disassemble bowl, and inspect conveyor flights
(refer to DER05026)
. Repair or replace conveyor, if required.
Failure Mode 3: Excessive Vibration
Bowl assembly unbalanced
due to uneven mechanical
wear, worn parts, or deformed
conveyor flights
Remove and disassemble bowl, and inspect conveyor flights
(refer to DER05026)
. Repair or replace conveyor, if required.