136 of 282 M-SV-001-EN Rev. G
Figure 4-146 SCR Terminals - Two Hole Mount
Figure 4-147 SCR Terminals - Four Hole Mount
8. All other terminals should read infinity or open in both directions (polarity). Refer to "Table
4-29 SCR Diode Values" on page 137.
4.19.2.2 Diodes Verification - Four Hole Mount
1. Isolate compressor power as described in Section "1.8 Electrical Isolation" on page 19.
2. Remove the Soft Start. Refer to "4.15.3 Soft Start Removal and Installation" on page 112.
3. Remove the AC mains input terminals and bus bars. Refer to "4.12.2 3-Phase Main Voltage
Input Terminal Block Removal and Installation" on page 98.
4. Remove the Capacitor Assembly. Refer to "4.22.3 DC Capacitor Bus Bar Assembly Removal and
Installation" on page 158.
5. Perform this test for each SCR.
6. 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 4-146 SCR Terminals - Two Hole Mount" and "Figure 4-147 SCR Terminals
- Four Hole Mount" for terminal locations.
7. Install the Capacitor and DC Bus Assembly and verify the SCR Temperature Sensor Cable is
not pinched. Refer to "4.22.4.4 DC Capacitor Bus Bar Assembly Installation - TTS/TGS/TTH/TGH
(Except TTS300/TGS230)" on page 163.
8. Install the Terminal Block and AC Bus Bars. Refer to "4.12 3-Phase Main Voltage Input Terminal
Block" on page 95.
9. Connect the Soft Start AC wires to the AC Bus Bars.
10. Install the Soft Start. Refer to "4.15 Soft Start" on page 107.
11. Install the top covers. Refer to "4.2 Compressor Covers" on page 56.
12. Return the compressor to normal operation.
Gate
3
1 (-)
2 (+)
1
3
2
Gate (Pins 4 and 5)
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