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M-SV-001-EN Rev.E
Troubleshooting
4.3 Bearing Calibration
4.3.1 When to Calibrate
the Bearings
4.3.1.1 Calibration When
Commissioning
4.3.1.2 Regular
Maintenance Calibration
4.3.1.3 Calibration when
Troubleshooting
4.3.2.1 Before Performing
a Calibration
4.3.2.2 Calibration
4.3.2 Performing a
Calibration
4.3.1.4 BMCC Change
A bearing calibration can be performed at
commissioning for the purpose of comparing
current calibration values to factory saved
calibration values. After the calibration has been
performed, a calibration report should be created
and saved for future comparison. There is no
requirement to save the calibration to EEPROM
when commissioning the compressor.
Calibration can be performed during regular
maintenance visits for the purpose of comparing
the values stored in EEPROM to the latest current
calibration values to determine changes over
time. There is no benefit to save the calibration
to EEPROM if the compressor has been operating
normally.
A calibration report should always be created for
future comparison.
Troubleshooting procedures that require a
bearing calibration to be performed will need
to be saved to EEPROM. Click on the “Save to
EEPROM” button even if a message indicating
values are out of range is displayed. Ensure that
“Stored” values are updated to be identical to
“Latest” values. Cycle power to the compressor
ensuring the green LED on the I/O board turns
off. This may need to be repeated multiple times.
Create a calibration report before any change
is made and after each calibration. Ensure the
shaft levitates correctly by clicking “Validate” after
calibration values have been saved to EEPROM.
• Interlock must be open
• RS485 or other external compressor
communication connection must be
disconnected.
1. Open the SMT and connect to the compressor.
2. Open the Bearing Calibration tool. The Bearing
Calibration tool displays. See Figure 97 (Bearing
Calibration Tool).
3. Click on the Start Calibration button.
• See the current Service Monitoring Tools User
Manual for further instructions on performing a
calibration and validation.
Once opened, the Calibration Tool will
automatically change the Compressor Control
Mode to Calibration Mode and send a delevitate
shaft signal to the bearing control. It is necessary
to verify the control mode of the compressor
after completing the calibration process.
A manual validation can be performed by clicking
the
Validate
button. Validation uses the stored
calibration values to momentarily levitate the
shaft and compares the values to tolerance limits.
If a replacement BMCC is installed in a
compressor, a calibration must to be performed
and saved to EEPROM, and repeated to match the
BMCC to the specific compressor.
NOTE
The compressor performs an automatic startup check bearing calibration after a power cycle.
Содержание Turbocor TT-300
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