4 - C H A P T E R -

C H A P T E R 4

Facility Power and Grounding Requirements

This chapter contains the requirements for the facility power and the grounding requirements for the Cluster Platform 15K/9960 system.

Facility Power Requirements

To prevent catastrophic failures, the design of your power system must ensure that adequate power is provided to your Cluster Platform 15K/9960 system. Sun suggests that all power circuits supplying power to the Cluster Platform 15K/9960 system be derived from dedicated electrical distribution panels. Electrical work and installations must comply with applicable local, state, or national electrical codes.

Caution - System earth fault protection relies on the building circuit.

Sun makes every effort to minimize the effects of power failures and interruptions to the hardware. The Cluster Platform 15K/9960 system has dual, redundant, current-sharing power supply inputs and is designed to make use of two independent power sources. However, if the computer equipment is subjected to repeated power interruptions and fluctuations, it is susceptible to a higher component failure rate than it would be with a stable power source. You must provide a stable power source, such as an uninterruptible power system (UPS), to reduce the possibility of component failures.

TABLE 4-1 lists the electrical specifications for the Cluster Platform 15K/9960 system. For the power connections for the expansion cabinet, refer to the Sun StorEdge Expansion Cabinet Installation and Service Manual. For the power connections for the Sun Fire 15K servers, refer to the Sun Fire 15K Site Planning Guide. For the power connections for the Sun StorEdge 9960 storage system, refer to the Hitachi Freedom Storage Lighting 9900 User and Reference Guide.


Electrical Service	Specification
Voltage	200-240 VAC, single phase
Frequency	47-63 Hz
Circuit breaker : North America and Japan Circuit breaker: International	30 circuits at 30A 30 circuits at 32A
Current drawn	23760 VA (max load)
Power cords (15 ft. maximum)	30
Receptacle: North America and Japan Receptacle: International P/N 180-1944-01	NEMA L6-30R or equivalent IEC 309, single phase, 32A

Note - The system is acceptable for use on TN [neutral connected to earth (terra), protective conductor connected to neutral]; and IT [neutral connected to earth (impedance), protective conductor connected to earth (terra)] power systems.


Electrical Service	Specification
Voltage at 60 Hz	200, 208, 230 VAC, three phase
Voltage at 50 Hz	200, 220, 230, 240 VAC, three phase
Voltage at 50 Hz	380, 400, 415 VAC, three phase
Frequency	47-63 Hz
Circuit breaker : North America and Japan Circuit breaker: International	2 circuits at 30A 2 circuits at 32A
Current drawn (controller)	2410 VA (max load)
Current drawn (disk array)	3720 VA (max load)
Power cords (15 ft. maximum)	2
Receptacle: North America and Japan	R&S 3754

Cabinet Grounding Requirements

The Cluster Platform 15K/9960 achieves earth ground through the power cords. For this reason, a grounding cable is not provided with the system. The power cords have three prongs: two for current and one for ground. At the AC input module, the ground prong, and system chassis are connected. Final chassis ground is achieved when the power cord is connected to a receptacle, where the ground prong contacts the power receptacle. For successful grounding, you must provide properly grounded power receptacles so that the power distribution unit (PDU) ground is earth ground.

A ground cable can be affixed to the system. While not required, the additional ground point allows leakage current to dissipate more efficiently. It is important to note that power cords are grounded through the receptacle and the ground cable must reference a common earth ground. Otherwise, a difference in ground potential can be introduced.

Caution - If you are unsure of the facility PDU receptacle grounding, do not install a ground cable until a proper PDU receptacle grounding has been confirmed. If a difference in ground potential is apparent, corrective action must be taken.

To Properly Ground the Cluster Platform 15K/9960 System

1. Ensure that you have properly grounded PDUs in the data center.

The PDU must be earth ground.

2. Ensure that all grounding points (raised floors and power receptacles) reference PDU ground.

Note - You must procure the grounding cable. A grounding cable is not shipped with the system.

3. Attach the ground cable to the system.

For the grounding locations for the expansion cabinet, refer to the Sun StorEdge Expansion Cabinet Installation and Service Manual. For the grounding location for the Sun Fire 15K server, refer to the Sun Fire 15K Site Planning Guide. For the grounding location for the Sun StorEdge 9960 storage system, refer to the Hitachi Freedom Storage Lighting 9900 User and Reference Guide.

The ground cable attaching area may be a painted surface. Ensure metal-to-metal solid contact is made for this installation.