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M-SV-001-EN Rev.E
3. Install the three bus bars to the terminal block
and secure them. See Figure 29 (Terminal Block
Bus Bars).
4. Install the screws that secure the three terminal
block bus bars to the SCR Diodes. See Figure 28
(Terminal Block Bus Bars).
5. Connect the three connectors of the Soft Start
Cable Harness to the bus bars. See Figure 28
(Terminal Block Bus Bars).
6. Replace the mains and the top covers.
Compressor Components
Figure 32 - Screws Securing
Terminal Block to Casting
3.3.4.4 Terminal
Block Installation
TT300/TG230
3.4.1 Function
1. Place the terminal block on the casting and
secure it with the screws.
2. Place the Mylar in the middle of the terminal
block before installing the fuse assembly. See
Figure 30 (AC Input to SCRs).
3. Install the fuse assemblies and secure the
terminal block adaptors to the terminal block.
See Figure 30 (AC Input to SCRs).
4. Install the screws that secure the fuse assembly
to the SCR at the AC input. Make note of the Soft
Start Cable Harness locations. See Figure 25 (Main
AC Input Terminal).
The Soft Start Board limits in-rush current
when power is applied to the compressor by
progressively increasing the conduction angle
of the voltage through the SCRs to charge the
DC capacitors. It uses a 3-phase voltage input at
50/60Hz, between 380-575VAC, and a DC voltage
signal from the SCR output to generate output
pulses of 0-12VDC to the SCR gates for the in-rush
current control signal.
In addition to monitoring the HV DC bus, the Soft
Start carries the fuse that both protects the high
power side electronics from the service side and
passes HV DC to the DC/DC Converter.
Main AC voltage is passed through a fast-acting
fuse to two onboard transformers that reduce
the primary voltage to a secondary 15VAC. One
transformer powers the Soft Start itself. The
second powers the HV DC/DC converter after DC
bus voltage levels reach the minimum level. Both
transformers pass the secondary voltage through
separate Nano fuses.
All DC voltages from the Soft Start Board are
with respect to the positive DC bus, not the
compressor ground.
3.4 Soft Start Board
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