Danfoss TTS350 - Soft Start Verification; Verifying Soft Start Voltages

Figure 4-96 Open-Top Soft Start Connections
Table 4-23 Open-Top Soft Start Connection Identification
No. Component
1 J7:SoftStartTemperatureSensorconnector
2 J3:ThermostaticFanControlconnector
3 J1:ACInputs
4 J8:DCLink
5 Ground
6 J2:SCRGateSignalconnector
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4.14.2 Soft Start Verification
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4.14.2.1 Verifying Soft Start Voltages
1. BeforeverifyingSoftStartvoltages,ensurethatthecorrect3-phasemainACvoltageispresentatthe
MainsInputterminals.
2. UsingtheDCbustestharness(refertoSection1.10DCBusTestHarnessInstallationandRemovalon
page25.)withpowerappliedtothecompressor,verifythattheexpectedDCbusvoltageispresentfor
theapplication.RefertoTable1-2ExpectedDCBusVoltageonpage29.
l
NoDCvoltagemayindicatethattheSoftStartisnotcontrollingtheSCRs,oranopenfuseon
Closed-TopSoftStarts
3. UsingtheDCbustestharnesswithpowerappliedtothecompressor,verifythatthe15VACtotheDC-
DCconverterispresent.Outputcanrangefrom12–25VAC,dependingonprimaryinputvoltage.
(Closed-TopSoftStartsonly)
l
No15VACmayindicateanopenfuseonClosed-TopSoftStarts
l
Ifthe15VACsupplyisnotpresentatstart-up,thePottedDC-DCconverterwillnotfunction
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M-SV-001-EN Rev. H-1/23/2023 Page 115 of 294