Danfoss Turbocor TTS Series, Service Manual

Page: 253 / 282

253 of 282
M-SV-001-EN Rev. G
5.3.5 Calibration Report Analysis
1. Data in Report: The difference between the “Latest Calibration” and “Stored Calibration” is less
than 30 percent.
• Interpretation:
Successful calibration.
2. Data in Report: Only one of the gain values equals zero.
• Interpretation:
Bearing or bearing sensor electrical fault, or one channel of the PWM
Amplifier is faulty.
• Action: Verify the PWM.
• Action:
Verify the bearings.
• Action: Verify the bearing sensors.
3. Data in Report:
More than one of the gain values is zero.
• Interpretation: Incorrect calibration procedure performed, bearing or bearing sensor
electrical fault, or more than one channel of the PWM Amplifier is faulty.
• Action:
Before beginning the calibration, verify the Interlock is open and all external
communication is disconnected.
• Action: Verify the PWM.
• Action:
Verify the bearings.
• Action: Verify the bearing sensors.
4. Data in Report:
One or more of the gain values exceeds 3.0.
• Interpretation: Bearing electrical fault or shaft is obstructed.
• Action:
Verify the bearings.
• Action: Verify the bearing sensors.
Refer to "Figure 5-3 Bearing Calibration Flow" on page 254.
5. Data in Report:
One or more of the bearing Force Current values exceeds 1.5A in Validation
Results.
• Interpretation: Bearing electrical fault or shaft is obstructed.
• Action:
Verify the bearings.
• Action: Verify the bearing sensors.
Refer to "Figure 5-3 Bearing Calibration Flow" on page 254.
6. Data in Report:
The difference between the “Latest Calibration” and “Stored Calibration” is
greater than 30 percent.
• Interpretation: Bearing/Shaft position has changed from stored to latest.
• Action:
Save to EEPROM and cycle power; test run compressor with new values.
• Action: Verify the bearings.
• Action:
Verify the bearing sensors.
Refer to "Figure 5-3 Bearing Calibration Flow" on page 254.