![background image](http://html1.mh-extra.com/html/danfoss/turbocor-tt-series/turbocor-tt-series_service-manual_4104524144.webp)
9. Install the Terminal Block and AC Bus Bars. Refer to Section 4.11.2 3-Phase Main Voltage Input Terminal
Block Removal and Installation on page 102.
10. Connect the Soft Start AC wires to the AC Bus Bars.
11. Install the Soft Start. Refer to Section 4.14.3 Soft Start Removal and Installation on page 117.
12. Install the top covers. Refer to Section 4.1 Compressor Covers on page 52.
13. Return the compressor to normal operation.
Table 4-28 SCR Diode Values
Positive (+) Lead
Negative (-) Lead
Expected Result
1
2
Infinity or Open
1
3
Infinity or Open
2
1
Infinity or Open
3
1
0.3V and 0.45V
4.18.2.3 Gates Verification
1. Isolate the compressor power as described in Section 1.8 Electrical Isolation on page 22.
2. Using needle-nose pliers, carefully remove the SCR Gate Cable Harness from the SCRs. Refer to Figure
4-140 SCR Connections - TTS300/TGS230 and Figure 4-141 SCR Connections - TTS/TGS/TTH/TGH Rev. F
and Earlier (Except TTS300/TGS230).
3. Using a multimeter set for resistance measurements, place the leads on the two (2) gate terminals. The
value should be between 1 to 25Ω.
4. Reverse the leads. The measured value should be the same.
NOTE
These values can vary depending on the meter being used and the environmental conditions at the time. It is important that the values be
consistent between SCRs.
Table 4-29 SCR Gate Resistance Ranges
SCR Model
Range
All models
1 - 25Ω
4.18.2.4 SCR Temperature Sensor
This section applies to TTS/TGS Revision G and earlier compressors only. The TTS/TGS Revision H and TTH
compressors do not utilize an SCR Temperature Sensor.
Figure 4-145 SCR Temperature Sensor Assembly
4.18.2.5 SCR Temperature Sensor Verification
1. Isolate the compressor power as described Section 1.8 Electrical Isolation on page 22.
2. Remove the Service Side Cover. Refer to Section 4.1.3.1 Service Side Cover Removal and Installation on
Page 144 of 294 - M-SV-001-EN Rev. H 1/23/2023
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