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M-SV-001-EN Rev. G
Figure 4-141 AC Input and Spade Connector Installation - TTS/TGS/TTH/TGH Rev. H (Except TTS300/TGS230)
6. Install the top covers. Refer to "4.2 Compressor Covers" on page 56.
7. Return the compressor to normal operation.
4.18.2.5 Soft Start AC/DC Harness Torque Specifications
Table 4-28 Soft Start AC/DC Harness Torque Specifications
4.19 Silicone-Controlled Rectifier
The AC input voltage is connected to the SCRs by the Mains Input bus bars. The SCRs are used to
convert the AC voltage into DC voltage. SCRs maintain the high voltage DC bus necessary to provide
power to the Inverter to run the compressor motor.
Using both the AC input voltage and the DC voltage output from the SCRs, the Soft Start Board
generates the gate signal and outputs pulses of 0-12VDC to the SCRs to control the in-rush current
when power is initially applied to the compressor. This is used at compressor start-up while the DC
capacitors are charging up.
The DC bus voltage output from the SCRs is approximately 1.35 times that of the AC input voltage
(460-900VDC).
There are two (2) different styles used for the compressors. Refer to "Figure 4-142 SCR Styles" on page
134 for the visual differences.
AC Bus Bar to SCR fastener,
M5x16 - 5 Nm
(44 in.lb.)
(3 places)
AC/DC Bus Bar (L1, L2, & L3)
Terminals
(3 places)
-DC Spade Connector
+DC Spade Connector
Description
Nm
Ft.Lb.
In.Lb.
AC Bus Bar to SCR fastener, M5x16
5
-
44
Soft Start DC+ & DC- to DC Bus Bolt/nut (TTS300/TGS230 only)
10
7
89
Cover fastener, M5x15
1.5
-
13
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