Rockwell Automation SA3100 AC Power Modules - Manual (Page 15)

Power Module Description 2-1
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Power Module Description
This chapter provides information on the Power Module’s mechanical and electrical
characteristics. The individual components of the Power Module differ according to
the type of input power (AC or DC) and the Power Module’s horsepower rating and
frame size. Appendix B provides a schematic diagram of each design. The following
sections provide a general description of the Power Module’s main components and
their functions.
2.1 Mechanical Description
AC input Power Modules have the following main components:
Three-phase AC input
• Three-phase incoming AC power terminals (R-L1, S-L2, T-L3) are provided on
terminal board TB1 for connection to the 230, 460, or 575 VAC line. Two current
transformers sense AC line current and provide feedback to the PMI Regulator.
MOV Surge Protector
• SA3100 Power Modules are equipped with MOVs (Metal Oxide Varistors) that
provide voltage surge protection, phase-to-phase and phase-to-ground protection
in conformance with IEEE 587.
Three-phase Rectifier
• The function of the rectifier is to convert the three-phase AC line voltage into an
unregulated DC voltage for use by the inverter section. Depending upon the power
rating, a six-pulse diode rectifier or a six-pulse SCR rectifier may be used.
All SA3100 Power Modules have the following main components:
Ground Fault Detection Circuit
• Hardware is provided to detect excessive ground current and generate a fault. For
models A001/Q001 and A003/Q003 the hardware trip point is 20A @ 10V. For all
other models it is 100A @ 10V.
Capacitor Bank Assembly
• The capacitor bank’s electrolytic capacitors store power for the IGBTs (insulated
gate bipolar transistors) in the power bridge to use to drive the motor.