218 of 282 M-SV-001-EN Rev. G
1. Align the two lower insertion guides of the BMCC so that they are on the inside of the two
upper insertion guides on the Bearing PWM Amplifier. Refer to "Figure 4-277 BMCC Insertion
Guides".
Figure 4-277 BMCC Insertion Guides
2. Slide the BMCC straight into the connector until firmly seated in the Backplane connector.
3. Install the Serial Driver. Refer to "4.27.4 Serial Driver Removal and Installation" on page 213.
4. Install Service Side Cover. Refer to "4.2.3 Service Side Cover" on page 58.
5. Return the compressor to normal operation.
6. If a BMCC that is not original to the compressor is installed, a calibration must be completed
and saved to the EEPROM to match the BMCC to the compressor. Refer to "5.3 Bearing
Calibration" on page 250.
4.29 Bearing Pulse Width Modulator Amplifier
Figure 4-278 PWM
4.29.1 PWM Function
The PWM Amplifier supplies current to the radial and axial magnetic bearing coils as commanded by
the BMCC. In return, the PWM passes feedback from the current sensor for the bearing coils to the
BMCC. Refer to "Figure 4-279 Bearing Control Signal Flow" on page 219.
SERIAL DRIVER
BEARING MOTOR COMPRESSOR CONTROLLER (BMCC)
BEARING PWM
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