Keymile SUPM1 - Thermal Management; Figure 17: Thermal Management Thresholds

User Manual
SUPM1
page 58 of 94© KEYMILE December 2015 EN/LZTBU 372 129/1 RC
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Functional Description
5.12 Thermal Management
The thermal management system on the SUPM1 prevents any damage of
the unit caused by overheating. It is achieved with a temperature sensor.
The board controller reads the sensor every second and determines the
required action.
There are three thermal states on SUPM1:
•In the normal state the unit works according to the specifications.
• If the unit temperature rises above 70 °C the overheat state 1 is
reached. In this state any new calls of normal priority subscribers in the
V5CAS or MCAS direct line operation mode are suppressed. New calls of
high priority subscribers in the V5CAS or MCAS direct line operation
mode are still possible. Ongoing calls are not affected.
In the other operation modes new calls are possible without restriction.
• If the unit temperature rises above 85 °C the overheat state 2 is
reached. All ongoing calls are immediately stopped.
A hysteresis of 2 °C for the temperature thresholds prevents from uncon-
trolled oscillations between the thermal states.
Figure 17: Thermal management thresholds
The subscriber priority is configured in the port configuration.
Please note:
In the V5CAS and MCAS direct line operation modes up to three high priority
ports can be configured per SUPM1 unit.
In the other operation modes all ports are handled as high priority ports.
Temperature
[°C]
Time
85
normal
state
83
70
68
over heat
state 1
over heat
state 1
over heat
state 2
normal
state
Threshold 2
Threshold 1