Danfoss Turbocor TT Series, Service Manual, Page: 167 / 294

Figure 4-178 Soft Start Cable Harness to DC Bus
4.21.2 DC Bus Voltage Verification
Use the DC Bus Test Harness to determine if DC bus voltage is within the correct range for the application. Refer to
Section 1.10 DC Bus Test Harness Installation and Removal on page 25.
4.21.2.1 Bleed Resistor Verification
NOTE
This verification step does not apply if the DC Capacitor Bus Bar Assembly contains the Balance Board.
1. Isolate the compressor power as described in Section1.8 Electrical Isolation on page 22 of this manual.
2. Disconnect the bleed resistor from one side of the capacitor.
3. Bend the bleed resistor back slightly until it no longer contacts the DC bus.
• • • CAUTION • • •
A faulty bleed resistor can be the result of a faulty DC capacitor.
4. Using a multimeter set for resistance measurement, place the leads on each of the bleed resistor
terminals. The measured value should be between 24.3kΩ and 29.7kΩ for TTS300/TGS230 compressors
or between 16.2kΩ and 19.8kΩ for TTS350, TTS400, TTS450, TTS500, TTS700, TGS310, TGS380, TGS390,
TGS520, TTH375, and TGH375 compressors.
4.21.2.2 Snubber Capacitor Verification
1. Isolate the compressor power as described in Section1.8 Electrical Isolation on page 22.
2. Remove the Soft Start. Refer to Section 4.14 Soft Start on page 113.
M-SV-001-EN Rev. H-1/23/2023 Page 167 of 294