Specifications

TROUBLESHOOTING Document No. DER05105
Effective Date 15 Jul 08 Page 7 of 16
Alarm and Fault Messages
Cause Corrective Action
Communication Failure with Solid End Bearing Temp Sensor (Cont’d)
Poor connection at liquid end
transmitter/intrinsic barrier or defective
transmitter
If reading is constantly 392°F (200°C), check and
correct connection; replace transmitter, if defective.
Defective bowl VFD Check and replace VFD, if defective.
Control Program Downloaded from Memory Card to Controller
Re-loading of PLC program from
memory card completed
Start centrifuge, and resume operation.
Controller Internal Battery Low, Replace
PLC battery connections not secure Check connections, and correct, if necessary.
PLC battery low Replace battery.
Conveyor High Torque Alarm, Reduce Feed Rate
Conveyor torque exceeds pre-set limit Reduce feed rate.
Conveyor High Torque Fault and Shutdown, Perform Cleanout and Reduce Feed Rate
Conveyor torque exceeds pre-set limit Following automatic shutdown, perform cleanout
procedure to remove solids buildup, and re-start
centrifuge at reduced feed rate.
Conveyor VFD Alarm, Ref Troubleshooting Section of User Manual
Temperature sensor signal cable
disconnected
Check and correct connection (refer to DER03022
and electrical schematic diagram in Section 11).
VFD temperature too high Check Conveyor VFD status screen for temperature
and alarm; shut down, lock out, and tag out
centrifuge to determine and correct cause of
overheating.
VFD load too high Reduce pump feed rate.
Conveyor VFD Communications Error
Confirm that green LED next to Ethernet cable is
lighted, indicating that hub is functional.
Check connections between conveyor VFD and
PLC, and correct any defects.
Conveyor VFD not communicating with
PLC
Replace conveyor VFD, if no other defect is found.
Conveyor VFD Fault and Shutdown, Ref Troubleshooting Section of User Manual
VFD fault detected, causing shutdown Check and replace conveyor VFD.