User's Manual

Product description
33
Current Management on the power supply (Lifextender)R
This is activated when the maximum current rated for continuous operation of the power
supply is exceeded. This value is lower than deliverable current limit and represents the
threshold which can be exceeded only for short periods (maximum 1 minute each time).
If this situation occurs, the “PSU current derating” function is activated (alarm “013” and,
if necessary, alarm “014”) and the ALC management algorithm, running in correct wor-
king mode, is replaced by another one in which the current delivered by the power supply
units has the highest priority in this case and the RF output power derated conseguently.
The current derating is deactivated when the power delivered rises to the value set by
the user and the maximum current provided by the power supply units is less than or
equal to the maximum value allowed for continuous operation.
Thermal Management on the power supply (Lifextender)
R
The power supply management algorithm that works to maintain the temperature of the
power supplies below a safe value is the same that operates in the RF section and is
logically connected in “OR” with that the derating (acting directly on the output power)
is activated when the power supply temperature exceeds 72°C (162° F).
Fault Management on the RF modules (Lifextender)
R
It allows to reduce the maximum RF output power according to the number of correctly
working RF amplifier modules, so that they don't could be stressed.
A special algorithm correlates the optimal RF output power with the number of these
modules.
To prevent any damage, the fans speed is increased to the maximum value.
Cooling Management on the RF modules (Lifextender)
R
In respect to the current cooling requirements, the fan speed rotation is automatically
adjusted from a minimum of 50% to a maximum of 120% approx. (these values may
change according to the models of used fan). The cooling demand evaluation is based
on accurate measurements of the temperature close to each MOSFET and to the power
supply units. The Cooling Management aims to:
1. extend the life of the fans;
2. minimize the quantity of dust which can be carried by the air flow;
3. allow the safe operation of the equipment also under extreme temperature condi
tions;
4. ensure that temperatures of mosfets and power supplies remain as stable as possi
ble to avoid thermal and mechanical stress;
5. reduce the energy consumption when a strong heat extraction is not needed.
Without Lifextender, the fans always operate at 100%.