Danfoss TTS400

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4.28.4PWMRemovalandInstallationonpage228
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4.27BMCConpage220
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4.26.4SerialDriverRemovalandInstallationonpage218
32. Applythecompressorpower.
33. Verifythe+17V,+15,+5and-15VDCtestpointsontheBackplane.
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Ifallvoltagesarewithin+/-10%,allsupplyvoltagesaregood
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Ifanyofthesevoltagesarenotwithin+/-10%,refertoSection5.5.2DeterminingtheCauseofan
EnergyDrain.
5.5.2 Determining the Cause of an Energy Drain
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5.5.2.1 Determining if Serial Driver is Draining Energy
1. RemovetheServiceSideCover.RefertoSection4.1.3.1ServiceSideCoverRemovalandInstallationon
page54.
2. TesttheBackplanevoltagesatthe+24V,+15,+5,and-15VDCtestpoints.
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Ifallvoltagesarewithin+/-10%,theSerialDriverisnotdrainingenergy
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Ifanyofthesevoltagesarenotwithin+/-10%),proceedtoStep3
3. IsolatethecompressorpowerasdescribedintheSection1.8ElectricalIsolationonpage22.
4. WaitfortheLEDsontheBackplanetoturnoff.
5. RemovetheSerialDriver.
6. Re-applythecompressorpower.
7. TesttheBackplanevoltagesatthe+24V,+15,+5,and-15VDCtestpoints.
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Ifallvoltagesarewithin+/-10%,theSerialDriverisdrainingenergy
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Ifanyofthesevoltagesarenotwithin+/-10%,anothercomponentisdrainingenergy
5.5.2.2 Determining if BMCC is Draining Energy
1. RemovetheServiceSideCover.RefertoSection4.1.3.1ServiceSideCoverRemovalandInstallationon
page54.
2. First,followtheprocedureinSection5.5.2.1DeterminingifSerialDriverisDrainingEnergy.
3. IsolatethecompressorpowerasdescribedintheSection1.8ElectricalIsolationonpage22.
4. WaitfortheLEDsontheBackplanetoturnoff.
5. RemovetheSerialDriver.RefertoSection4.26.4SerialDriverRemovalandInstallationonpage218.
6. Re-applythecompressorpowerandtesttheBackplanevoltagesatthe+24V,+15,+5,and-15VDCtest
points.
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Ifallvoltagesarewithin(+/-10%)theBMCCisnotdrainingenergy
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Ifanyofthesevoltagesarenotwithin(+/-10%)proceedtoStep5
7. IsolatethecompressorpowerasdescribedintheSection1.8ElectricalIsolationonpage22.
8. WaitfortheLEDsontheBackplanetoturnoff.
9. RemovetheBMCC(refertoSection4.27BMCConpage220).
10. Re-applythecompressorpower.
11. TesttheBackplanevoltagesatthe+24V,+15,+5,andthe-15VDCtestpoints.
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Ifallvoltagesarewithin(+/-10%)theBMCCisdrainingenergy
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Ifanyofthesevoltagesarenotwithin(+/-10%)anothercomponentisdrainingenergy
M-SV-001-EN Rev. H-1/23/2023 Page 271 of 294