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4.22.2 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 "1.10 DC Bus Test Harness Installation and Removal" on page 22.
4.22.2.1 Bleed Resistor Verification
NOTE
This verification step does not apply if the DC Capacitor Bus Bar Assembly contains the Balance Board.
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 Section "1.8 Electrical Isolation" on page 19 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 TT300/TG230
compressors or between 16.2kΩ and 19.8kΩ for TT350, TT400, TT500, TT700, TG310, TG390,
TG520, TTH375, and TGH375 compressors.
4.22.2.2 Snubber Capacitor Verification
1. Isolate the compressor power as described in Section "1.8 Electrical Isolation" on page 19 of
this manual.
2. Remove the Soft Start. Refer to "4.15 Soft Start" on page 107.
3. Remove the Snubber Capacitors. Refer to "Figure 4-183 Snubber Capacitor Removal - TTS300/
4. Using a multimeter set for capacitance measurement, place the leads on the capacitor
terminals. The measured value should be 0.42μF to 0.52μF.
4.22.3 DC Capacitor Bus Bar Assembly Removal and Installation
• • • CAUTION • • •
The DC Bus Capacitor Assembly should not be disassembled. Bleed resistors, bus bars, and capacitors are factory assembled and should
only be removed and installed as a single component. Incorrect disassembly/assembly will result in damage to the compressor.
4.22.4 DC Capacitor Bus Bar Assembly General Removal
1. Isolate the compressor power as described in Section "1.8 Electrical Isolation" on page 19 of
this manual.
2. Remove the Soft Start. Refer to "4.15.3 Soft Start Removal and Installation" on page 112.
3. Continue to "4.22.4.1 DC Capacitor Bus Bar Assembly Removal - TTS300/TGS230" for TT300/
TG230 compressors and for all other TT/TG compressors, continue to "4.22.4.2 DC Capacitor
Bus Bar Assembly Removal - TTS/TGS/TTH/TGH (Except TTS300/TGS230)" on page 160.
4.22.4.1 DC Capacitor Bus Bar Assembly Removal - TTS300/TGS230
1. Remove the DC Bus Bars from the SCRs. Refer to "Figure 4-182 DC Bus Bar and Soft Start
Harness Removal - TTS300/TGS230" on page 159 for this and the following step.
2. Disconnect the DC+ and DC- of the Soft Start harness from the DC bus assembly noting the
orientation.
Summary of Contents for Turbocor TTS Series
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