User's Manual

V-1
Section V – Power Supply
Switching AC-DC power supplies are used to power the amplifier pallets, the control circuits, and all of
the fans. There is one power supply in the power supply enclosure to generate the necessary current
for the amplifier pallets. This supply is set at 31.0 Vdc nominally and fed to the power amplifier
enclosure via 4-AWG multi-stranded conductors and high current connectors. There are no power
supplies internal to the power amplifier enclosure, with the exception of those found on the Series II-I
control PCB. All fans run off of this same supply, though they pass through a series dropping resistor
to lower the supply voltage down, as the fans are 24Vdc.
The power supply in the power supply enclosure is a Mean Well PSP-1500 and is fully protected
against short circuit and output overload. Short circuit protection is a cycling type power limit. The
internal AC fuse is designed to blow only on a catastrophic failure in the unit – the fuse does not blow
on overload or short circuit. The thermal shutdown automatically recovers when the power supply
chassis cools down.
AC is fed into the power supply enclosure via a filtered AC entry and then through a resettable circuit
breaker before passing through a rocker switch. This switch turns the AC on and off to the switching
power supply.