Dell EMC PowerEdge R240 - Power, thermal, and acoustics; Power supply units; Thermal

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Power, thermal, and acoustics
Power supply units
The power supply subsystem is formed with a AC-DC cable power supply. The power supply provides +12V and +12Vaux for non-
redundant design. There are several voltage regulators in the system to supply dierent voltage levels needed by dierent logic
devices.
The Dell EMC PowerEdge R240 supports a 250W cabled AC power supply unit (PSU).
The following table shows the technical specications of the power supply:
Table 6. Dell EMC PowerEdge R240 PSU specications
PSU Class
Heat
dissipation
(maximum) Frequency Voltage
AC
Current
High line
100–240 V
Low line 100–
120 V
250 W AC Bronze 1039 BTU/hr
50/60 Hz
100-240 V
AC,autorangin
g
250 W N/A 4.0A-2.0 A
NOTE: This system is designed to connect to the IT power systems with a phase-to-phase voltage not exceeding 230 V
Thermal
The thermal design of the PowerEdge R240 reects the following:
• Optimized thermal design
– The system layout is architected for an optimum thermal design i.e. system component placement and layout are designed to
provide maximum airow coverage to critical components with minimum expense of fan power.
– Custom heat sink designs for CPU, chipset for optimum component cooling
• Comprehensive thermal design
– The power required to cool a server can contribute a signicant amount to the overall system power. Thermal control is the
active management of system cooling through fan speed and system power management to make sure that the system is
reliable while minimizing system fan power consumption, airow, and system acoustic output.
– The PowerEdge R240 thermal control system regulates the fan speed based on several dierent responses from critical
components’ temperature sensors as well as inventory for system congurations:
◦ Open and closed loop fan speed control. Open loop control uses system conguration information to determine fan speed
based on system inlet temperature. Closed loop control method uses component temperature feedback from various sub-
systems to dynamically determine optimum fan speeds.
◦ Increase airow through a fan oset if required.
◦ Increase airow through increasing minimum fan speed.
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