Danfoss Turbocor TTS Series - Page 275

275 of 282
M-SV-001-EN Rev. G
Figure B-24 Compressor Voltage Troubleshooting Flowchart (Sheet 3)
Electricallyisolate
compressor–Refer
toElectricalIsolation
1.7
RemoveTopCover
RemoveDCBusTest
Harnessandre‐
installtheJ2andJ3
outputstoDC‐DC
Re‐installTopCover
andremoveService
SideCover
Re‐applymains
power
VerifytheHV+and
24VDCtestpoints
onBackplane
Bothvoltag es
within+/‐10%?
Yes
No
Electricallyisolate
compressor
Removeall
connectorsfrom
Backplane,leaving
onlytheJ6(IGBT
cable),J4(250VDC),
andJ24(VDC)inputs
connected
RemoveSerial
Driver,BMCC,and
PWM
Re‐applymains
power
VerifytheHV+and
24Vtestpointson
Backplane
Arevoltages
within+/‐10%?
No
ReplaceDC‐DC
Yes
Verifythe+17V+5
andthe‐15and+15
voltageand
resistancevalues
Areallvoltages
within+/‐10%?
No
ReplaceBackplane
Yes
Electricallyisolate
compressor
Re‐installall
connectorsandthe
PWM,BMCCand
SerialDriverto
Backplane
Re‐apply
compressorpower
Verifythe+17V,
+15V,+5and‐15
voltages
Areallvoltage s
within+/_10%?
Yes
Ifanyofthevoltages
arenotwithin+/‐
10%refertoSection
5.5.2“Determine
theCauseofan
EnergyDrain.”
No
End
B