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M-SV-001-EN Rev.E
Compressor Components
3.16.4 Removal and
Installation
3.16.4.1 PWM Amplifier
Removal
1. Isolate compressor power and wait for the LEDs
on the Backplane to turn off.
2. Remove the Serial Driver.
3. Remove the BMCC.
4. Loosen the fasteners that hold the retaining
clips over the connectors of the front and rear
radial bearing feed throughs.
• If this is a “new” style PWM with Molex
connectors (refer to Figure 76 - Bearing PWM
Amplifier for identification), you will only need to
disconnect the Molex connector for the PWM and
bearing feed through.
5. Remove the PWM connectors from the bearing
power feed throughs on the front and rear radial
bearings.
• Note the orientation of both connectors and
ensure this is retained when reinstalling.
6. Remove the fasteners below the PWM that
secure the heat sink to the main compressor
housing. See Figure 79 (Removing the PWM
Amplifier).
7. Pull the bearing PWM amplifier from J1 of the
Backplane.
Figure 79 - Removing the
PWM Amplifier
3.16.4.2 PWM Amplifier
Installation
1. Check that the ground screw at the lower right
of the Backplane is tight before replacing the
PWM.
2. Align the heat sink of the PWM with the two
guide pins in the main compressor housing.
3. Insert the PWM into the J1 connector of the
Backplane.
4. Secure the heat sink of the PWM to the main
compressor housing with three fasteners.
5. Ensure the heat sink of the PWM is firmly
seated against the main compressor housing.
6. Place the two connectors on the front and
rear radial bearing feed throughs and secure the
retaining clips over them.
• If this is a Major Revision “F” or later PWM with
Molex connectors (refer to Figure 76 - Bearing
PWM Amplifier for identification), you will only
need to connect the Molex connector for the
PWM and bearing feed through.
7. Re-install the BMCC.
8. Re-install the Serial Driver.
9. Re-install Service Side Cover.
NOTE
Prior to replacing a PWM, verify the bearing coils.
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