https://www.hartmann-electronic.com/
9
Rev. 1.3
3.3.2
Temperature sensors and fan control
For 2U and 4U systems is a temperature-dependent fan control integrated.
The fan speed will be controlled by external temperature sensors (NTC). Three or six
temperature sensors are located on the left-hand side on the backplane.
NTC fan 1 - Slot 1, NTC fan 2 - Slot 2, NTC fan 3 - Slot 3, etc. (see figure below).
Fan 1
+12V
GND
Control
GND
NTC 1, Slot 1
Fan 2
+12V
GND
Control
GND
NTC 2, Slot 2
Fan 3
+12V
GND
Control
GND
NTC 3, Slot 3
Fan 4
+12V
GND
Control
GND
NTC 4, Slot 4
Fan 5
+12V
GND
Control
GND
NTC 5, Slot 5
Fan 6
+12V
GND
Control
GND
NTC 6, Slot 6
Figure 3-7 Pin assignment fan signal connector
3.3.3
Temperatur range
With the three-
pole “Dip
-
Switch” on the rear side of the backplane, behind the power supply
connectors, is it possible to choose between two temperature ranges (see figure 3-8).
•
Dip-switch ON = 22°C to 37°C
•
Dip-switch OFF = 34°C to 44°C
Figure 3-8 Dip-Switch
Dip-Switch
ON = fan characteristic 22
– 37°C
OFF = fan characteristic 34
– 44°C
