
Vega-MV Router Multiviewer - User Manual
Issue 1 Revision 2
Page 25
© 2017 SAM
Thermal Protection, Thermal Shutdown
Product Introduction 3.8
3.8 Thermal Protection, Thermal Shutdown
The MV-NET card and the MV-1000PSU power supply module contain thermal shut down
logic and protection circuits to prevent overheating.
3.8.1 MV-NET Card Thermal Protection
The MV-NET card can react with a series of initiated responses intended to reduce the
temperature and then the power consumption of the rack considerably and so slow any
internal temperature rise due to abnormal cooling.
The initial response of the MV-NET card to an internal temperature rise above 35ºC is to
increase the fan speed in order to increase the airflow in the chassis and cool it down.
If the temperature detected in the immediate vicinity of the MV-NET card continues to rise, the
temperature-dependant thermal management actions in Table 4 are taken:
Fans:
If three or more fan failures are reported, then on-screen and browser warning messages will
appear indicating the failure and the thermal management actions will then be implemented
as necessary.
Threshold
Action
Internal
Temperature
35
o
C
When this threshold is exceeded:
The MV-NET card increases the fan speed in order to increase the airflow in
the chassis and cool it down.
Warning
threshold
60
o
C
When this threshold is reached:
An on-screen warning message appears indicating the temperature
and asking the user to check the ventilation of the rack is unobstructed.
High power
threshold
65
o
C
If the detected temperature exceeds this threshold for more than a minute:
The ‘high power consumption’ hardware in the video input chain are put into
reset mode. The on-screen message informs the user that this happened.
Low power
threshold
70
o
C
Above this threshold:
The video output cards are also held in reset. The on-screen multiviewer
display will disappear as the video output is disabled.
Note 1:
If the detected temperature drops below the Warning threshold,
all reset hardware is reactivated.
Table 4
Front Fan LED Status
Front Fan LED
Description
Off
All fans working correctly.
Flashing Red
One or more fan failures detected.
Solid Red
Critical Fan failure (more than two fans have failed)
or Over Temperature alarm: Frame is in its thermal management state.
Table 5
Front Fan LED Status