R2000GZ and R2000GL

Intel
®
Server System R2000GZ/GL Product Family TPS
subsystem to shutdown or become over loaded. The default state of the power subsystem is all power
supplies ON. There needs to be at least one power supply in Cold Redundant Active state or Standard
Redundant state to allow the Cold Standby state power supplies to go into Cold Standby state.
3.8.1 Powering on Cold Standby supplies to maintain best efficiency
Power supplies in Cold Standby state shall monitor the shared voltage level of the load share signal to sense
when it needs to power on. Depending upon which position (1, 2, or 3) the system defines that power supply
to be in the cold standby configuration; will slightly change the load share threshold that the power supply shall
power on at.
Table 23. Example Load Share Threshold for Activating Supplies
Enable Threshold for
V
CR_ON_EN
Disable Threshold for
V
CR_ON_DIS
CR_BUS De-asserted / Asserted
States
Standard
Redundancy
NA; Ignore dc/dc_ active# signal; power supply is always ON
OK = High
Fault = Low
Cold Redundant
Active
NA; Ignore dc/dc_ active# signal; power supply is always ON
OK = High
Fault = Low
Cold Standby 1 (02h)
3.2V (40% of max)
3.2V x 0.5 x 0.9 = 1.44V
OK = Open
Fault = Low
Cold Standby 2 (03h)
5.0V (62% of max)
5.0V x 0.67 x 0.9 = 3.01V
OK = Open
Fault = Low
Cold Standby 3 (04h)
6.7V (84% of max)
6.7V x 0.75 x 0.9 = 4.52V
OK = Open
Fault = Low
Notes:
Maximum load share voltage = 8.0V at 100% of rated output power
These are example load share bus thresholds; for a given power supply, these shall be customized to maintain
the best efficiency curve for that specific model.
3.8.2 Powering on Cold Standby supplies during a fault or over current condition
When an active power supply asserts its CR_BUS signal (pulling it low), all parallel power supplies in cold
standby mode shall power on within 100μsec
3.8.3 BMC Requirements
The BMC uses the Cold_Redundancy_Config command to define/configure the power supply’s roll in cold
redundancy and to turn on/off cold redundancy.
The BMC shall schedule a rolling change for which PSU is the Active, Cold Stby1, Cold Stby 2, and Cold Stby
3 power supply. This allows for equal loading across power supply over their life.
Events that trigger a re-configuration of the power supplies using the Cold_Redundancy_Config command.
o AC power ON
o PSON power ON
o Power Supply Failure
o Power supply inserted into system
3.8.4 Power Supply Turn On Function
Powering on and off of the cold standby power supplies is only controlled by each PSU sensing the Vshare bus.
Once a power supply turns on after crossing the enable threshold; it lowers its threshold to the disable
threshold. The system defines the ‘position’ of each power supply in the Cold Redundant operation. It will do
this each time the system is powered on, a power supply fails, or a power supply is added to the system.
The system is relied upon to tell each power supply where it resides in the Cold Redundancy scheme.
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