Specifications

5/2/2013 888-2500-001 4-9
WARNING: Disconnect primary power prior to servicing.
Section 4 Theory of Operation
DAX-1/DAX-3
• Provides over-current protection for the low voltage power supplies (+/-12Vdc,
5Vdc, & +48Vdc)
• Provides power for the cooling fans
• Provides DC bus output voltage regulation
• Provides the DC bus discharge function
Figure 4-5 Single Phase Power Supply Controller Block Diagram
4.4.2.1 Main Controller Interface
The Power Supply Controller board serves as the control interface between the
transmitters Main Controller and the DC power supply. The circuitry on the Power
Supply Controller Board allows the Main Controller to adjust the DC bus voltage and
provides the Main Controller with power supply fault and over-temperature status
information, a transformer secondary AC voltage sample, and a DC bus current sample.
The power supply is enabled and disabled via commands from the Main Controller.