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M-SV-001-EN Rev.E
Compressor Components
3.6 DC Bus
3.6.1 Function
The DC bus includes the bus bars, DC capacitors,
snubber capacitors, and bleed resistors. See
Figure 38 (DC Bus Components Identification).
The SCRs output DC voltage to the bus bars.
DC capacitors serve as energy storage and
filter out the voltage ripple associated with the
operation of the rectifier circuit and any voltage
unbalance in the 3-phase supply.
Snubber capacitors reduce noise associated with
the Inverter switching frequency.
Bleed resistors are used to discharge the
capacitors after power is removed to allow the
compressor to be serviced safely.
See Figure 38 (DC Bus Components Identification)
for location of the DC bus components.
Figure 38 - DC Bus
Components Identification
• • • CAUTION • • •
The DC Bus Capacitor Assembly should not be disassembled. Bleed resistors, bus bars, and capacitors are factory assembled
and should only be removed and installed as a single component. Incorrect dissassembly/assembly will result in damage to the
compressor.
Snubber Capacitors
Bus Bars
Bleed Resistors
DC Capacitors
Snubber Capacitors
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