Table 7-7 Cooling Budget - Emerson AXP1620 Installation And Use Manual

Shelf Management Alarm Module
126
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The FTMs have 110 fan speed settings. The SAM uses a proprietary cooling algorithm to
automatically adjust the fan speed to cool the chassis based on sensor data from the blades as
well as inlet and outlet sensors on the FTMs. The minimum fan speed is 1.
In normal operating conditions, the cooling algorithm adjusts the fan speed based on the
ambient air temperature as measured at the inlet fans to maintain a deltaT value (calculated to
be the rise in air temperature measured at the inlet and outlet fan sensors) based on the inlet
air temperature value. The lower the ambient temperature, the higher the rise in temperature
allowed.
The deltaT set point is calculated as follows:
Set Point
S1
S2
For ambient air temperatures at or below 25°C (default T1), the deltaT set point is set to 20°C
(default S1). For ambient air temperatures at or above 55°C (default T2), the deltaT set point is
set to 10°C (default S2). For ambient air temperatures between T1 and T2, the deltaT set point
is calculated using the following algorithm:
Using the above algorithm, at 40°C ambient, the cooling algorithm adjusts the fan speeds to
maintain a deltaT rise in temperature at 15°C.

Table 7-7 Cooling Budget

Ambient Temperature
25°C
T1
S2 - S1
(T
S1 +
inlet
T2 - T1
Temperature Rise
Delta T = 20° C
AXP1620 Installation and Use (6806800E23E)
Hardware Monitoring and Control
T2 Inlet Air Temperature
- T1)