52 Product description
2.9 Protections
The equipment has an integrated protection system both for the hardware and the
software.
2.9.1 Software protections
2.9.1.1 IPF (Intelligent Proportional Foldback)
Mechanism which is activated on the control unit and works on each individual machi-
ne.
The IPF is an intelligent system which reduces the equipment’s output power in the
event of strong load mismatch, thus preventing the machine from turning off.
The activation of this feature is shown on the display as alarm “026” for modulators and
“030” for amplifiers.
2.9.1.2 IPC (Intelligent Power Control)
It is provided on the amplifiers in the system.
When the equipment is working properly, the IPC keeps the amplifier output power
constant
(and subsequently, the transmitter output power) within +/-1% of the target set, irre-
spective of mains voltage, temperature and load variations.
The IPC also allows the RF section efficiency to be optimized by making the MOSFETs
constantly work at maximum efficiency, thus minimizing overall electrical consumption.
2.9.1.3 Safety Management (“Lifextender” option) ®
The Safety Management consists of algorithms which perform a real-time analysis of
the transmitter’s operating status and operates in order to maintain the output power
set, according to the type and severity of any errors (internal or environmental) that
may occur.
The Safety Management can control an output power reduction proportional to the
severity of the error that arises.
The algorithms act at different levels and in various sections of the equipment: Thermal
Management on the RF unit, Thermal Management on Dummy Load, Current Manage-
ment on the power supply unit, Thermal Management on the power supply unit, Fault
management on the RF unit, Fault Management on the power supply unit, Cooling
Management on the fan unit.
Thermal Management on the RF unit (Lifextender) ®
It is provided on amplifiers and exciters.
If the temperature measured in the vicinity of the MOSFETs exceeds 72 °C, a first level
of derating intervenes slightly in order to reduce the temperature through an output
power reduction.
The power reduction is the lowest possible that allows a thermal balance to be reached
at a temperature of less than 72 °C.
The output power reduction never exceeds 40% with this first derating. In other words,
the output power is always 60% higher than that set by the user, and the “- 3 dB” war-
ning with corresponding alarm does not intervene. This first derating level is effective in
virtually all cases.
The activation of this feature is shown on the display as alarm “010”.
Should the first level derating be insufficient (extremely rare), a second level inter-
venes, further reducing the power, thus obtaining a thermal balance status which is
compatible with the safe operation of the equipment even if it is below – 3 dB (with
subsequent “005” alarm).
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