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 are (2) supplies are set at 31.0 Vdc nominally. All fans run off this same supply, though
they pass through a series dropping resistor to lower the supply voltage, as the fans are 24Vdc.
A 24Vdc nominal power supply is located in the combiner enclosure. It simply supplies power to the
control PCB and the cooling fan.
The power supplies in the power supply enclosure are Absopulse HBC3600-P5677, adjusted to 31.0V
with no load. The power supply found in the combiner/filter enclosure is a Mean Well S-60-24. 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 4-position circular connector and then
through a resettable circuit breaker. The AC for the combiner/filter enclosure (220Vac or 110Vac) is
fed through a filtered EMI AC entry.