Danfoss Turbocor TT Series, Service Manual

Page: 143 / 294

6. Install the DC Bus Bars to the SCRs. Refer to Section 4.21.3 DC Capacitor Bus Bar Assembly Removal and
Installation on page 168.
7. Install the top covers. Refer to Section 4.1 Compressor Covers on page 52.
8. Return the compressor to normal operation.
Figure 4-143 SCR Terminals - Two-Hole Mount
Figure 4-144 SCR Terminals - Four-Hole Mount
4.18.2.2 Diodes Verification - Four-Hole Mount
1. Isolate compressor power as described in Section1.8 Electrical Isolation on page 22.
2. Remove the Soft Start. Refer to Section 4.14.3 Soft Start Removal and Installation on page 117.
3. Remove the AC mains input terminals and bus bars. Refer to Section 4.11.2 3-Phase Main Voltage Input
Terminal Block Removal and Installation on page 102.
4. Remove the Capacitor Assembly. Refer to Section 4.21.3 DC Capacitor Bus Bar Assembly Removal and
Installation on page 168.
5. Using a multimeter set for diode measurements, place the black (-) lead on terminal 1 of the SCR and
place the red (+) lead on terminal 3. The measured value should be between 0.3V and 0.45V. Refer to
Figure 4-143 SCR Terminals - Two-Hole Mount and Figure 4-144 SCR Terminals - Four-Hole Mount.
6. All other terminals should read infinity or open in both directions (polarity). Refer to Table 4-28 SCR
Diode Values on page 144.
7. Perform this test for each SCR.
8. Install the Capacitor and DC Bus Assembly and verify the SCR Temperature Sensor Cable is not pinched.
Refer to Section 4.21.4.4 DC Capacitor Bus Bar Assembly Installation - TTS/TGS/TTH/TGH (Except
TTS300/TGS230) on page 174.
M-SV-001-EN Rev. H-1/23/2023 Page 143 of 294