Specifications

Document No. DER05105 TROUBLESHOOTING
Page 6 of 16 Effective Date 15 Jul 08
Alarm and Fault Messages
Cause Corrective Action
Bowl VFD Undervoltage Alarm, Ref Troubleshooting Section of User Manual
Incoming power loss or low voltage
supply
Monitor and correct incoming power defect(s).
Communication Failure with Bowl Speed Sensor
Incorrect or loose connection at speed
sensor, sensor out of adjustment, or
defective sensor
If reading on Bowl VFD status screen is about 4000
RPM, check connection (refer to DER03022
); if
connection is secure, adjust sensor (see Speed
Sensor Adjustment). Replace sensor if adjustment
does not correct problem.
Incorrect connection at PLC Check that all connectors are securely seated, as
described in this section.
Defective transmitter/intrinsic barrier for
speed sensor
Check and replace transmitter/intrinsic barrier, if
defective.
Defective pump VFD Check and replace VFD, if defective.
Communication Failure with Liquid End Bearing Temp Sensor
Incorrect or loose connection at
temperature sensor
If reading is constantly about 392°F (200°C), check
and correct connection (refer to DER03022
and
electrical schematic diagram in Section 11).
Incorrect connection at PLC Check that all PLC connectors are securely seated,
as described in DER04098
.
Defective temperature sensor If reading is constantly about 392°F (200°C), sensor
is defective; replace sensor.
Defective liquid end transmitter/intrinsic
barrier or poor connection
Check connection and/or replace transmitter, if
defective.
Defective bowl VFD Check and replace VFD, if defective.
Communication Failure with Solid End Bearing Temp Sensor
Temperature sensor connection
insecure or disconnected
If reading is constantly about 392°F (200°C), check
and correct connection (refer to DER03022
and
electrical schematic diagram in Section 11).
Incorrect connection at PLC Check that all PLC connectors are secure, as
described in this section.
Defective temperature sensor If reading is constantly 392°F (200°C), sensor is
defective; replace sensor.