A bearing calibration is not required to have been performed in order to validate (levitate) the shaft. Using the
validation process in this manner will allow the technician to know if the shaft can levitate freely using the stored
calibration data.
5.3.3.2 Save to EEPROM
When saving to the EEPROM, the “latest” calibration values overwrite “stored” values.
There is no requirement to save calibrations to EEPROM after performing a bearing calibration. Comparing original
factory calibration values stored in EEPROM to the latest calibration allows determination of long-term changes.
Saving to EEPROM permanently overwrites existing stored calibration values. “Stored” values are used for startup
check at the next power cycle. The previous values cannot be recovered once the new values are saved to EEPROM.
Original calibration values should only be overwritten when replacing a BMCC in the field, or when required for
troubleshooting a bearing issue with a compressor.
NOTE
If the latest calibration values differ from the stored values outside of the tolerances set in the SMT, a warning message will appear when
saving to the EEPROM.
This compares changes from the stored calibration to the latest and may be an indicator of shaft/bearing alignment changes.
5.3.4 Create a Calibration Report
The calibration report compares current bearing calibration values to stored values. There is no requirement to
perform a bearing calibration before creating a calibration report. There is also no requirement for saving a bearing
calibration (if performed) to EEPROM before creating a calibration report.
Perform the following steps to create a report:
1. Click the Calibration Report button.
2. Select a location to save the report. The report will be generated as a Portable Document Format (PDF)
document.
5.3.5 Calibration Report Analysis
1. Data in Report: The difference between the “Latest Calibration” and “Stored Calibration” is less than 30
percent.
l
Interpretation: Successful calibration
2. Data in Report: Only one of the gain values equals zero.
l
Interpretation: Bearing or bearing sensor electrical fault, or one channel of the PWM Amplifier is
faulty
l
Action: Verify the PWM
l
Action: Verify the bearings
l
Action: Verify the bearing sensors
3. Data in Report: More than one of the gain values is zero.
l
Interpretation: Incorrect calibration procedure performed, bearing or bearing sensor electrical fault,
or more than one channel of the PWM Amplifier is faulty
l
Action: Before beginning the calibration, verify the Interlock is open and all external
communication is disconnected
l
Action: Verify the PWM
l
Action: Verify the bearings
l
Action: Verify the bearing sensors
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Summary of Contents for Turbocor TT Series
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