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 are (2) power supplies paralleled in the power supply enclosure to generate the
necessary current for the amplifier pallets. These (2) supplies are paralleled 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 IIG 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 supplies in the power supply enclosure are (2) Mean Well PSP-1000. The switching power
supplies are 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 (220Vac) is fed into the power supply enclosure via a filtered AC entry and then through a
resettable circuit breaker. It is then current limited with a resettable circuit breaker before passing
through a rocker switch. This switch turns the AC on and off to the switching power supply.