Service Monitor User Manual
Danfoss Turbocor Compressors Inc. 33
ECD-00007M Rev. 1
6.5.2 Bearing Faults
This section describes the possible faults displayed in the
“Magnetic Bearing Monitoring” window. Table 11 provides
a description of the possible cause of the fault. If a fault
occurs, refer to the Troubleshooting Manual for the
appropriate procedure(s) to follow.
6.6 Electronic Valve Data / Tuning
The “Electronic Valve Data / Tuning” window allows the
user to:
• Control the electronic expansion valve stepper
motors
• Control the analog output
To view the “Electronic Valve Data / Tuning” window,
select “Window”→ “Expansion Valves” from the menu bar,
or click on the “Expansion Valves” icon located below the
menu bar.
To access the stepper motor control settings, select the
“Stepper Motor” tab. The “EXV#1 Control Settings”
controls the stepper motor connected to “EXV1” on the
Alarm Code Hexadecimal bearing alarm code from the bearing motor control.
Fault Text Box Displays the most recent active bearing fault.
Refer to 6.5.2 "Bearing Faults" for fault details.
Graph Graphical representation of the front radial orbit of the shaft.
Percentile shown at the bottom right-hand corner indicates the average
front orbit displacement.
Note: The domain of the graph shows half of the allowable area of
shaft displacement. However, if the shaft orbit is shown to exceed 500
units in any direction, then there is excessive shaft vibration, possibly
caused by a surge of gas flow.
Table 10 Bearing Monitoring Parameters (Continued)
Parameter Description
Table 11 Bearing Faults
Fault Possible Cause
Calibration Failed Manual calibration performed on compressor failed.
Startup Check Failed Automatic calibration during compressor startup failed.
Axial Displacement Fault Current force exerted on the axial bearing exceeds 60% of the
calibration value.
Front Radial Displacement Fault Current force exerted on the front radial bearing exceeds 60% of
the calibration value.
Rear Radial Displacement Fault Current force exerted on the rear radial bearing exceeds 60% of the
calibration value.
Axial Static Load Current force exerted on the axial bearing exceeds 2.5 amps.
Front Radial Static Load Current force exerted on the front radial bearing exceeds 2.5 amps.
Back Radial Static Load Current force exerted on the back radial bearing exceeds 2.5 amps.
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