![background image](http://html1.mh-extra.com/html/danfoss/turbocor-tt-series/turbocor-tt-series_service-manual_4104524226.webp)
Figure 4-252 Bearing Control Signal Flow
4.28.2 PWM Connections
J1 on the Backplane is the PWM connection port. The PWM heat sink is secured with fasteners to the compressor
housing below the Backplane.
The 6-pin/wire connects to the rear (left) bearing power feedthrough. The 4-pin/wire connects to the front (right)
bearing power feedthrough. Refer to Figure 4-251 PWM on page 225 for an illustration of a Major Revision "F" and
later compressor.
4.28.3 PWM Verification
NOTE
l
A faulty PWM Amplifier may be the result of a bearing failure and may cause a failure of the Potted DC-DC resulting in a
blown F1 fuse on the Closed-Top Soft Start
l
If a PWM Amplifier is found to be faulty, the bearing actuator coils, DC-DC, and F1 Fuse must also be verified
Several verification methods are available for the PWM:
l
Verify if the PWM is draining energy
l
Verify functionality of the five (5) output channels
l
Verify functionality of the five (5) diode sets
Page 226 of 294 - M-SV-001-EN Rev. H 1/23/2023
Содержание Turbocor TT Series
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