
Introduction and General Information
ADDvantage-32 PLUS ● AC to DC Power Converter
1-12
1.2.6 DRIVE BASE ASSEMBLY (POWER CONVERTERS ONLY, 10 THROUGH 510 and
550 ADC)
The DRIVE BASE ASSEMBLY (Figure 1-8) on power converters rated 10 through 510
and 550 ADC contains all of the high voltage components. Heat generated by the SCR's
is dissipated by the heat sinks included in the base assembly. The drive base assembly
for 510 ADC and below is shown in Figure 1-8, and for 550 ADC in Figure 1-9. The
base assemblies include the following:
Power Thyristor Bridge
The POWER THYRISTOR BRIDGE is a 6-pulse bridge which rectifies the incoming
3-phase voltage to DC. It permits the DC output voltage to be controlled, thereby
controlling the speed of the connected DC motor. In the 4-quadrant, regenerative drive,
two 6-pulse bridges are arranged in a back-to-back (non-circulating current)
configuration which controls voltage and current for motoring and regenerating in both
forward and reverse directions.
Shunt Field Supply
The SHUNT FIELD SUPPLY is a single phase thyristor/diode bridge which controls the
excitation current to the motor's shunt wound field.
The AC supply comes from the 3-phase main supply. AC line fuses protect the converter
against overcurrents caused by shorts.
Control Power Transformer
The control power transformer provides 115 VAC power for operation of the control
circuitry and cooling fans. The only jumper on the drive is the control transformer
configuration. Correctly jumper the transformer for 230 or 460 VAC incoming line-
voltage.
The 550 amp drive base assembly includes optional configurations for 230, 460, or
575 VAC input. Refer to paragraph 6.6.4.
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