Datasheet

Intel® Server Board S2600CW Family TPS Intel® Server Board S2600CW Platform Management
Revision1.11
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5.3.14.7 Power Supply Fan Speed Control
This section describes the system level control of the fans internal to the power supply over
the PMBus*. Some, but not all Intel® Server Systems supporting the Intel® Xeon® processor E5-
2600 v3 product family will require that the power supplies be included in the system level
fan speed control. For any system that requires either of these capabilities, the power supply
must be PMBus*-compliant.
5.3.14.7.1 System Control of Power Supply Fans
Some products require that the BMC control the speed of the power supply fans, as is done
with normal system (chassis) fans, except that the BMC cannot reduce the power supply fan
any lower than the internal power supply control is driving it. For these products the BMC FW
must have the ability to control and monitor the power supply fans through PMBus*
commands. The power supply fans are treated as a system fan domain for which fan control
policies are mapped, just as for chassis system fans, with system thermal sensors (rather than
internal power supply thermal sensors) used as the input to a clamp algorithm for the power
supply fan control. This domain has both piecewise clipping curves and clamped sensors
mapped into the power supply fan domain. All the power supplies can be defined as a single
fan domain.
5.3.14.7.2 Use of Power Supply Thermal Sensors as Input to System (Chassis) Fan
Control
Some products require that the power supply internal thermal sensors be used as control
inputs to the system (chassis) fans, in the same manner as other system thermal sensors are
used for this purpose. The power supply thermal sensors are included as clamped sensors
into one or more system fan domains, which may include the power supply fan domain.
5.3.14.8 Fan Boosting due to Fan Failures
Intel® Server Systems supporting the Intel® Xeon® processor E5-2600 v3 product family
introduce additional capabilities for handling fan failure or removal as described in this
section.
Each fan failure shall be able to define a unique response from all other fan domains. An OEM
SDR table defines the response of each fan domain based on a failure of any fan, including
both system and power supply fans (for PMBus*-compliant power supplies only). This means
that if a system has six fans, there will be six different fan fail reactions.
5.3.14.9 Programmable Fan PWM Offset
The system provides a BIOS Setup option to boost the system fan speed by a programmable
positive offset or a “Max” setting. Setting the programmable offset causes the BMC to add the
offset to the fan speeds that it would otherwise be driving the fans to. The Max setting causes
the BMC to replace the domain minimum speed with alternate domain minimums that also are
programmable through SDRs.