Power Wiring Configurations For the M5000 Server

C H A P T E R 7

This chapter describes your server’s input power sources.

The following topics are in this chapter:

In a Sun Rack 1000/900

In a Sun Rack II

Circuit Breaker Capacity and Characteristics

Grounding

To prevent catastrophic failures, the design of your input power sources must ensure that adequate power is provided to your midrange servers. Use dedicated AC breaker panels for all power circuits that supply power to your server. Electrical work and installations must comply with applicable local, state, or national electrical codes.

7.1 In a Sun Rack 1000/900

To ensure redundant power sourcing, use the recommended wiring configurations for the M5000 server in a Sun Rack 1000/900 38/42.

The Sun Rack 1000/900 can fit up to two modular power supplies (MPS). Each MPS is two rack units (U) tall. The MPS must be installed in the bottom of the cabinet.

Note - Before using the cords that come with your Sun Rack 900/1000 with MPS units, disconnect the power strips from the MPS and connect the systems directly into the MPS using the cords. The power strips cannot be used to power any additional devices in the cabinet.

Note - The numbering in a Sun rack reads from bottom to top and right to left.

TABLE 7-1 Recommended Wiring Configurations for Three M5000 Servers With One 60A 3-phase MPS
Server	M5000 PSU_3	M5000 PSU_2	M5000 PSU_1	M5000 PSU_0
M5000_2	MPS_0-B5	MPS_0-A5	MPS_0-B4	MPS_0-A4
M5000_1	MPS_0-B3	MPS_0-A3	MPS_0-B2	MPS_0-A2
M5000_0	MPS_0-B1	MPS_0-A1	MPS_0-B0	MPS_0-A0

TABLE 7-2 Recommended Wiring Configurations for Three M5000 Servers With Two 30A 3-Phase MPS
Server	M5000 PSU_3	M5000 PSU_2	M5000 PSU_1	M5000 PSU_0
M5000_2	MPS_1-B2	MPS_1-A2	MPS_0-B2	MPS_0-A2
M5000_1	MPS_1-B1	MPS_1-A1	MPS_0-B1	MPS_0-A1
M5000_0	MPS_1-B0	MPS_1-A0	MPS_0-B0	MPS_0-A0

FIGURE 7-1 Sun Rack 1000 With Three M5000 Servers and Two MPS

Figure showing Sun Rack 1000 with three M5000 servers and two MPS.

Figure Legend
1	Server 2	10	MPS_0-B
2	Server 1	11	MPS_0-A
3	Server0	12	A2
4	MPS_1	13	A1
5	MPS_0	14	A0
6	PSU_3	15	A
7	PSU_2	16	A4
8	PSU_1	17	A3
9	SU_0	18

7.2 In a Sun Rack II

To ensure redundant power sourcing, use the recommended power wiring configurations for the M5000 server in a Sun Rack II.

Sun supports up to two PDUs in a Sun Rack II cabinet, one on either side. Sun SPARC Enterprise M5000 servers can use PDU types 15k, 25k, or 35k.

For more information on PDUs in a Run Rack II, refer to the Sun Rack II User’s Guide.

Note - The PDU numbering in the Sun Rack II reads from the left side, bottom to top and the right side, top to bottom. The M5000 server power supplies are numbered from right to left.

TABLE 7-3 Recommended Wiring Configurations for Three M5000 Servers With Two PDUs
Server	PSU_3	PSU_2	PSU_1	PSU_0
M5000_2	PDU A, Group 5	PDU B, Group 0	PDU A, Group 4	PDU B, Group 1
M5000_1	PDU A, Group 3	PDU B, Group 2	PDU A, Group 2	PDU B, Group 3
M5000_0	PDU A, Group 1	PDU B, Group 4	PDU A, Group 0	PDU B, Group 5

FIGURE 7-2 Sun Rack II With Three M5000 Servers and Two PDUs

Figure showing Sun Rack II with three M5000 servers and two PDUs.

Figure Legend
1	PDU A	5	Group_2
2	PDU B	6	Group_3
3	Group_0	7	Group_4
4	Group_1	8	Group_5

7.3 Circuit Breaker Capacity and Characteristics

Qualified racks housing these midrange servers require their own customer-supplied circuit breaker and AC receptacle for each power cord. Provide a stable power source, such as an uninterruptible power system (UPS), to reduce the possibility of component failures. 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.

Note - If the appropriate electrical receptacle is not available in your country, the connector may be removed from the cord. The cord can then be permanently connected to a dedicated branch circuit by a qualified electrician. Check local electrical codes for proper installation requirements.

7.4 Grounding

Both midrange servers are shipped with grounding-type (three-wire) power cords. Always connect the cords into grounded power outlets. Each power cord will also supply your server with proper earth ground. Sun has tested the racks for radiated and conducted emissions and have determined there is no difference in emissions with or without a ground strap grounding the racks. No additional earth grounding is necessary but it may be added if desired.

Contact your facilities manager or a qualified electrician to determine what type of power is supplied to your building.