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2.2
Amplifier Motherboard
The Amplifier Motherboard houses the power supply circuit, interfaces the audio to the amplifier modules,
and monitors the integrity of the loudspeaker lines, using AC line surveillance with the AEL01/AEL02 Active
End of Line Device or DC line surveillance using ASL EOL10K End of Line Resistors.
With loudspeaker line surveillance enabled the presence of open or short circuit or earth fault is indicated
for each amplifier by an LED indicator on the iPAM400 front panel. These faults are also reported to a
connected control system over the IP network.
The Amplifier Motherboard also provides the interface for the controls and indicators located on the
iPAM400 front panel.
2.2.1
Mains and Battery Power Supply
The iPAM400 is designed to operate with either or both of two power supplies:
•
230 V AC mains supply (European standard): 230 V, 50 Hz, +/–10%
•
24 V DC battery supply: 21 to 27.6 V (from a nominal 24 V lead acid battery pack)
Each of the two power supplies has its own power ON/OFF switch. These switches are protected from
inadvertent operation by the mainframe front panel when this is fitted.
Mains/battery changeover is achieved by simple diode changeover to give uninterrupted changeover in the
event of mains failure.
In order to prevent battery discharge the power supply circuit is designed to ensure that the DC supply
voltage does not fall below the battery voltage under the worst-case combination of low mains and full
amplifier load.
The power supply electronics is split into two halves. One half feeds amplifier slots 1 & 2, the other slots
3 & 4. This allows amplifiers in the separate halves of the same frame to be used for multiple circuits
without a common point of failure in the power supply circuits affecting all amplifiers.
2.2.2
Auxiliary Power Supply Output
The iPAM400 provides an auxiliary supply output (21 V to 38 V) which can be used to supply other pieces of
equipment up to a limit of 1 A. This supply output is derived from the mains and battery supplies. The
auxiliary power supply output and the integrity of the auxiliary supply fuse are monitored and indicated via
a front panel LED.
iPAM400 – Product Manual
U-0629-0171.doc – Issue: 04 complete, approved
Page 16 of 138
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