Overview Of OCP Open Rack Standard V3 Power System
OCP Engineering WorkshopRack and PowerOverview of OCP Open RackStandard V3 – Power SystemHamid KeyhaniFacebookShaun HarrisJuly 10th, 2019Microsoft
Key ORv3 Power Features One power zone with 48V output voltage. Flexible and modular power system can add more power and/or backup as needed. can be placed anywhere in the rack. Independent Power & Battery systems – Higher reliability. Peak power shaving - with regulated battery backup approach. Universal AC power Whip – whip part of data center.
Main V3 New Power Components1.2.3.4.5.6.7.Power shelf – 3 options.48V rectifier module – 3kW.Shelf Management Controller (SMC) for Power & Battery shelves.Power/Battery shelf output connector.Universal 7-pin Input Connector for the Power Shelf.Independent Battery Shelf.Regulated Battery backup module.
Power Shelf – Option 1 1U shelf with two AC power input. 6x 3kW rectifier slots. Output power: 15kW with N 1 and dual cords. 3-phase 480/277 Vac input rated. Direct connect to tap-boxes/facility – nointermediate PDU.
RegionalConnectorPower Shelf – Option 1Universal 7 PinConnector48V BusbarRear View
Power Shelf – Option 2 1U shelf with one AC power input. 6x 3kW rectifier slots. Output power: 15kW with N 1 and single cord. 3-phase 480/277 Vac input rated. Direct connect to tap-box/facility – nointermediate PDU.
Power Shelf – Option 3 2U shelf with two AC power input. 12x 3kW rectifier slots. Output power: 18kW with N N. 36kW with 2 units (4U) N N. Can be considered 33kW with N 1. 3-phase 480/277 Vac input rated. Direct connect to tap-boxes/facility – nointermediate PDU.
3kW 48V Rectifier Input: Single-phase, 200-277V, 50/60Hz. Single Output: 42-58V (adjustable), 54.5V nominal. Efficiency (incl. fan): Peak: 97.5% Full-load : 97% Communication: single CAN bus (with other rectifiers and SMC) Active current sharing (through CAN bus.) EMI: EN55022 Class A. THD: 5% for AC input current.
Shelf Management Controller(SMC) Universal shelf monitoring and control moduleRMM RMM24x RJ45sRJ45PSU1PSU2PSU3PSU4PSU5PSU6 Used for both battery and power shelves.SMC Communication upstream through: Modbus (RS485) Ethernet internalbuses Server, storage, etcRJ45 Single CAN bus for communication with downstreamcomponents (rectifiers or battery packs) Monitors and collect each component parameters (voltage,current, SOH, faults, etc) Remote Firmware Update Send command to each/all components (change voltage setpoint, battery test, etc) Components use same CAN bus for inter-communication foractive current sharing.RJ45 BBU1 BBU2 BBU3 BBU4 BBU5 BBU6SMC
Universal Power Shelf Input Connector 7 pin connector to be configurable as: Star connection Delta Connection Single phase Includes branching on the connector plug,e.g. 5 wire cable to 7 pin. 50A/480V rated. Pluggable solution - whip part of datacenter.Example:5 wireExample:5 wirecablecable toto7 7pinpinconnectorbranchingconnectorbranching
Power and Battery Shelf OutputConnector Floating connector blindmates to busbar. Assembled on the rear side of the power and batteryshelves. 12/48V, 500A rated. Floating connector blindmates to busbar, so gives theflexibility of: Place power and battery shelves any desirable location onthe rack. Can add more power and/or battery shelves as needed.
Battery Backup Module and Shelf Independent Battery system – Higher reliability. Doesn’t rely on the power shelf for the power transfer. Peak power shaving - with regulated battery backup approach. Matches the power of the power shelf: 15kW w/ N 1. Current design target: 10 minutes backup time in 4U at end of life.
Some rack power config examples15kW @ N 1w/o battery backup15kW @ N 1w/ battery backup15kW @ N 1w/ battery backup18kW @ N 1w/o battery backup(power cord entry fromtop and/or bottom)(power cord entry fromtop and/or bottom)
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1. Power shelf –3 options. 2. 48V rectifier module –3kW. 3. Shelf Management Controller (SMC) for Power & Battery shelves. 4. Power/Battery shelf output connector. 5. Universal 7-pin Input Connector for the Power Shelf. 6. Indep
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