Danfoss Turbocor TT Series

Table 4-42 Backplane Test Point Values
Test Point Test Point Reference DC Voltage Range Minimum Resistance
HV+ HV- 220to280 250Ω
+17HV HV- 16.5to17.85 28Ω
+24V 0V 22to26 9Ω
+15V 0V 14.75to15.25 20Ω
-15V 0V -14.75to-15.25 150Ω
+5V 0V 4.75to5.25 8Ω

9. Installanycomponentsthatmayhavebeenremovedwhiletesting.
10. InstalltheServiceSideCover.RefertoSection4.1.3.1ServiceSideCoverRemovalandInstallationon
page54.
11. Returnthecompressortonormaloperation.
4.25.3 Backplane Removal and Installation

4.25.3.1 Backplane Removal
1. Isolatecompressorpower.
2. WaitfortheBackplaneLEDstoturnoff.
3. RemovetheSerialDriver.RefertoSection4.26.4SerialDriverRemovalandInstallationonpage218.
4. RemovetheBMCC.RefertoSection4.27BMCConpage220.
5. RemovethePWM.RefertoSection4.28.4PWMRemovalandInstallationonpage228.
6. DisconnectandremoveallremainingconnectorsfromtheBackplane.RefertoFigure4-238Backplane
Connectionsonpage212.
7. RemovetheInverterGroundfastenerfromthetoprightoftheBackplanetoreleasetheInvertercable
groundring.
8. ReplacetheInvertergroundfastener.
9. Removethethree(3)fastenersthatsecuretheBackplaneFrametothehousing.Donotremovethe
fasteneratthetopleftorbottomcenteroftheBackplanesothecircuitboardremainsintheframe.
RefertoFigure4-242RemovingtheBackplaneonpage216.

M-SV-001-EN Rev. H-1/23/2023 Page 215 of 294