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Temperature / System monitoring
Temperature and system monitoring aim to reliably protect the computer hardware against damage
caused by overheating. However, unnecessary noise is prevented with a fan speed adapted to the
temperature conditions. In addition, important information on the operating state of the device
(temperature, operating voltate, fan speeds, error states) is provided. The cover monitoring system
indicates an unauthorized opening of the device.
These functions are controlled by the Baseboard management controller.
The following functions are supported:
Temperature monitoring:
Measurement of the processor temperature, measurement of the air temperature upon entry with a
temperature sensor.
Temperature control:
The fan speed of the system fan is controlled depending on the air temperature upon entry. When a
specified temperature limit is exceeded, the processor clock frequency is also reduced (throttling
mode) to prevent further warming of and damage to the processor.
Fan monitoring:
Blocked fans or a reduced fan speed due to ageing can be detected with the fan monitoring
function. Blocked fans are operated with 12 V pulse voltage. An attempt is made to restart a blocked
system fan with a cyclical voltage pulse. If the system fan is removed with the device switched off,
this results in an error message when the device is switched on again. This is indicated optically by
the flashing of the system error LED on the control panel. In addition, an entry is generated in the
BIOS Error Log.
Fan control:
The system fan and power supply fan are controlled in dependence on the temperature.
When exceeding predefined temperature threshold the fanmotors in the power supply modules are
accelerated to maximale rotational speed.
Sensor monitoring:
The installed sensors are also monitored. If a sensor outputs an impermissible value, this results in
an increase in the fan speed to the maximum value in order to ensure the maximum possible
protection of the hardware.
A failed sensor results in an error message. This is indicated optically by the flashing of the Health
LED on the control panel. In addition, an entry is generated in the BIOS Error Log.
Cover monitoring:
Unauthorised opening of the cover is detected, even when the system is switched off. However, this
will only be indicated when the system is switched on again.
This procedure generates an entry in the BIOS Error Log.
English - 7
A26361-D1501-Z120-2-7419
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