User's Manual Part 3

Front-End Power Supply Module - 117 -
®
Affinity LBD-200C-N1 Transmitter
Product Manual
15 Front-End Power Supply Description
The Front-End Power Supply Module provides the 48VDC level required to power the Driver
and PA Modules of the Affinity LBD-200C-N1 transmitter .The Front-End Power Supply Module
outputs the 48V
DC to the connector boards located within the Sub-Chassis Assembly. The
Driver and Amplifiers derive the power from these connector board assemblies.
The Front-End Power Supply Module is a 4000-Watt device containing current limiting, thermal
shut down, and fuse protection circuitry. The required input voltage is 208V
AC 3-phase @
50Hz.-60Hz. The nominal output voltage is +48V
DC. A potentiometer on the Front-End Power
Supply Module is used to adjust the output supply level (factory adjust).
LED indicators located on the supply front panel assembly provide visual feedback of Front-End
Power Supply operation.
Two internal 600 CFM forced air fans provide convection cooling for the Front-End Power
Supply Module.
The Front-End Power Supply is plugged into the Power Supply Adapter located in the Chassis
assembly.
The 5.25” high, Front-End Power Supply Chassis can contain up to three 48V
DC power
supplies. The rack is designed to allow the power supply modules to operate in a current
sharing mode when more than one module is installed (N+1 applications). The Power Supply
Chassis operates off the mains AC power and is fuse protected on TB1.
A circuit breaker assembly is attached to the rear of the chassis to provide DC over-current
protection for the PA Modules.
The Front-End Power Supply Modules are “Hot Swap” compatible. When operated in N+1
configurations, defective supplies may be removed and replaced without shutting the entire
transmitter system down.