Danfoss Turbocor TT Series, Service Manual, Page: 265 / 294

Figure 5-2 Bearing Calibration Tool
If the message “Calibration Failed” or “Levitation Failed” appears when attempting to calibrate, it indicates the steps
expected by the SMT have not been completed. To determine the cause of failure, verify the following:
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Ensure there are no faults present; the shaft will not levitate for validation if a fault is present
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Ensure the RS485 at J1 on the I/O board is disconnected from external communication; if the chiller
controller automatically sets the control mode, it will stop the calibration process prematurely
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Ensure Interlock is open
5.3.3 After Calibration is Complete
The message “Calibration Complete” appears when all SMT calibration steps are complete, regardless of the results.
There will be three options available after the calibration has completed.
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Validate
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Save to EEPROM (If the Save to RAM & EEPROM radio button is selected on the Connection Manager
Window)
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Create Report
Each of these are described in separate sections below.
5.3.3.1 Validate
By validating the calibration, you are levitating the shaft using the stored calibration data. If you validate before
Saving to EEPROM, the latest calibration data has no impact on the shaft position.
M-SV-001-EN Rev. H-1/23/2023 Page 265 of 294