Danfoss TTS300

4.24.2.3 Input Resistance Measurement
1. IsolatethecompressorpowerasdescribedinSection1.8ElectricalIsolationonpage22.
2. UnplugallconnectorstotheDC-DCConverter.
3. Usingamultimetersetforresistancemeasurements,placethemultimeterleadsintheJ1,HVDCinput
plugterminals.RefertoFigure4-229PottedDC-DConpage206andFigure4-230OpenFrameDC-DC
onpage206.Theresultshouldnotbe0.0Ω.Theresultcanbeopen(infinity)or>150kΩdependingon
thepolarityofthetestleads.
4. ReversethemultimeterleadsontheJ1plugterminals.Theresultshouldnotbe0.0Ω.Theresultcanbe
open(infinity)or>150kΩ.
5. InthePottedDC-DC,PlacethemultimeterleadsinJ4,15VACinputterminals.Theresultshouldbe
>1MΩ.
NOTE
l
J4(15VACinput)isonlyforthePottedDC-DCConverter
l
Ifresistanceislow,allowtimeforittorise
6. ReversethemultimeterleadsontheJ4terminals.Theresultshouldbe>1MΩ.
4.24.2.4 Output Resistance Measurement
1. IsolatethecompressorpowerasdescribedinSection1.8ElectricalIsolationonpage22.
2. UnplugallconnectorstotheDC-DCConverter.
3. Usingamultimetersetforresistancemeasurements,placethemultimeterleadsontheJ2,250VDC
outputterminals.RefertoFigure4-229PottedDC-DConpage206andFigure4-230OpenFrameDC-
DConpage206.Theresultshouldbearisingorfallingvalue,notstatic,zero,orinfinity.
4. ReversethemultimeterleadsontheJ2(250VDCoutput)terminals.Theresultshouldbearisingor
fallingvalue,notstatic,zero,orinfinity.
5. PlacethemultimeterleadsinthemiddlerowoftheJ3,24VDCoutputterminalsforthepottedDC-DC
ConverterorJ4fortheopenframeDC-DCConverter.RefertoFigure4-228J3/J4-24VDCOutput
Connector.Theresultshouldbearisingorfallingvalue,notstatic,zero,orinfinity.
Figure 4-228 J3/J4 - 24VDC Output Connector
6. Reversethemultimeterleadsonthe24VDCoutputterminalsandmeasuretheresistance.Theresult
shouldbearisingorfallingvalue,notstatic,zero,orinfinity.
NOTE
Shouldtheoutputresistancesshowunexpectedvalues,re-verifyeachoutputmorethanonce.Thebestverificationisidentifyingthe
correctOutputVoltagesarepresentwhenInputVoltageiscorrect.

M-SV-001-EN Rev. H-1/23/2023 Page 205 of 294