4535 611 98931 iE33 Service Manual Page 78
CSIP Level 1 Theory of Operation: Physical Structure
Platform Power Distribution Board
• Mounts to the back wall of the Platform Card Cage and receives voltages from the Platform
Power Supply via bus bars and distributes to connectors
• Provides a low impedance connection for the Platform Power Supply outputs
• Contains voltage sense resistors from the Platform Power Supply for +3.3 Vdc and +5 Vdc
• Provides test points and LEDs to indicate that the Platform Supply is functioning correctly
Acquisition Power Supply Module
• Provides +3.5 Vdc, ±5.3 Vdc, ±15 Vdc, and +48 Vdc.
• Detects AC input voltages (100 to 120 Vac or 220 to 240 Vac).
• Operates between 85 Vac and 264 Vac at 47 to 63 Hz.
• Thermal, over-voltage, and over-current protected: If temperature, voltage, or current
exceeds the normal range (Tabl e 9-4 ), all voltages or currents shut down. Cycle AC power
to reset.
• Remote sense for +3.5 Vdc, ±5.3 Vdc, and ground.
• Fused primary voltages: Fuses are under the power supply cover.
• If something occurs to take the Acquisition Power Supply down, the Platform Power Supply
also suspends operation. This may happen if the Acquisition Power Supply is working fine and
a voltage goes out on a system PCB.
• Supplies +48 Vdc to the HV Switcher to operate the system front end.
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