Danfoss Turbocor TT Series

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

4.14.2 Soft Start Verification

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


M-SV-001-EN Rev. H-1/23/2023 Page 115 of 294