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Oracle® SL8500 StorageTek Modular Library System Systems Assurance Guide E24254-08 |
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# 4 Power

The SL8500 library has specific power specifications and requirements.

## Power Calculator

The intent of the power calculator is to provide guidance for estimating the electrical and heat loads for typical operating conditions and selected configurations.

- The power calculator can be found at: `http://www.oracle.com/us/products/servers-storage/storage/tape-storage/sl8500-modular-library-system/overview/index.html`.

  Click on the link for the Power Calculator.

- Customers may also go to: `http://www.oracle.com/us/products/servers-storage/sun-power-calculators/index.html`

  Search for the StorageTek SL8500 Modular Library System under the tape libraries section.

## Power Usage

The table below lists the power specifications for the SL8500 library and tape drives.

Table 4-1 SL8500 Power Specifications

Component | Quantity | Idle Watts | Maximum Continuous Watts
--- | --- | --- | ---
Base Library | 1 | 212 | 320
Dual Robotics (8 Handbots) | 1 | 112 | 220
Redundant Electronics | 1 | 100 | 100
Pass-thru Ports | Each | 20 | 22
Rack Space | Each | -- | 720
T9x40 Tape Drive | Each | 93 | 140
T10000 Tape Drive | Each | 53 | 98
LTO Tape Drive | Each | 28 | 43
SDLT Tape Drive | Each | 44 | 67

## Internal Power Configurations

The SL8500 library has two internal power configurations: N+1 or 2N (optional).

### N+1 Power Configuration

The N+1 power configuration provides DC power redundancy by adding an additional power supply to each DC power grid. The N+1 configuration contains two power distribution units (PDUs): one "system" PDU and one N+1 PDU.

The system PDU distributes AC power from the customer's branch circuit to the three DC power grids, the electronics control module, and the N+1 PDU.

The N+1 PDU provides AC power to an extra 48 VDC load sharing power supply on each of the three DC power grids, plus an extra AC-to-DC converter for the Electronics Control Module. If a single power supply fails, there is still enough DC power available on the failed power supply's corresponding power grid to keep the entire system operational until the power supply can be replaced.

Note: The N+1 power configuration provides only DC power redundancy.

Figure 4-1 N+1 Power Configuration

### 2N Power Configuration

The 2N power configuration is an optional feature that provides both DC and AC redundancy. The configuration requires a second "system" power distribution unit (PDU) attached to a separate branch circuit. Each system PDU delivers AC power to its own group of load sharing power supplies.

If something within an AC power source fails, the second AC power source supplies power to the entire system except the operator panel if AC1 fails. If a DC power supply fails, there is still enough power available to keep the entire system operational until the power supply can be replaced.

This configuration provides power to the same components as N+1, plus:

- Power for the additional 2N load sharing power supplies (required)

- Power for 2 additional 19-inch racks (1 & 3) each with six outlets

- Power for the redundant AC-to-DC converters for the ECM

Figure 4-2 2N Power Configuration (Optional Feature)

## AC Power Options

The SL8500 library has three external AC power options:

- Delta: One 3-phase input for each system PDU

  - 200–240 VAC, line-to-line, three phase, 40 Amps, 50–60 Hz (mostly used in the United States)

- Wye: One 3-phase input for each system PDU

  - 200–240VAC, line-to-neutral, three phase, 24 Amps, 50–60 Hz, (mostly used in Europe)

- Three single-phase: inputs are required for each system PDU

  - 200–240 VAC, single phase, 24 Amps, 50–60 Hz

It is highly recommended to:

- Connect to three-phase power whenever possible.

- Let a licensed electrician connect the external power cables.

### Three-Phase Power - Delta or Wye

Connecting to three-phase power is highly recommended. The single-phase power option requires three circuits for the N+1 configuration and uses six circuits for a 2N power configuration and redundancy. The single-phase power option is provided for customers that do not have access to three-phase power.

There are two 3-phase power options to choose from: Delta or Wye:

Delta:

- Used when the voltage measured from phase-to-phase is 200-240 VAC

- Requires four wires (3-phases plus ground), do not use neutral (a fifth wire)

Wye:

- Used when the voltage measured from phase-to-phase is 380–415 VAC

- Requires five wires (3-phases, ground, and neutral), neutral (N) is required

### AC Power Connections

The figure below shows the AC power connections for the SL8500 library.

WARNING: Having a licensed electrician connect the external power cables is highly recommended.

AC wiring from the power source branch circuit must be installed in conduit (flexible or rigid) with a 90-degree elbow-down fitting. There are six holes provided for the conduit elbows that measure 2.875 cm (1.125 in.) in diameter. The electrician should choose appropriate conduit and fittings for their application that will fit this. The terminal block hole is 6.35 mm (0.250 in.) in diameter, tin plating over brass, and can accommodate up to #6 wire. Wire Range is 6 mm (14 AWG).

In the figure below, AC 1 on the left corresponds to N+1 PDU(standard) and AC2 on the right corresponds to 2N PDU (optional).

Figure 4-3 Delta or Wye

Note: AC input (cable and wiring) to the 2N PDU is not required if using an N+1 configuration.

#### Connectors

If plugs and connectors are required instead of using conduit, the table below lists the Hubbell part numbers (or equivalent) that can be used.

Table 4-2 Hubbell Connectors and Plugs (IEC 309)

Part Number | Description
--- | ---
HBL330P6W | Single Phase US plug 30 amp
HBL330C6W | Single Phase US connector 30 amp
HBL332P6W | Single Phase Europe plug 32 amp
HBL332C6W | Single Phase Europe connector 32 amp
HBL532P6W | Wye plug 32 amp
HBL532C6W | Wye connector 32 amp
HBL460P9W | Delta plug 60 amp
HBL460C9W | Delta connector 60 amp
L15-50 R | NEMA Delta receptacle (250 V, 50 Amp)
L15-50 P | NEMA Delta plug (250 V, 50 Amp)

### Circuit Breaker Ratings

The minimum circuit breaker ratings required for the service panel are listed in the tables below.

Table 4-3 Conduit Circuit Breaker Ratings

Option | Panel Breaker | Service Rating | Connector | PDU Breaker
--- | --- | --- | --- | ---
Single Ph. | 30 Amps | 30 Amps | — | 30 Amps
Delta | 50 Amps | 50 Amps | — | 40 Amps
Wye | 30 Amps | 30 Amps | — | 30 Amps

Table 4-4 Connector (US) Circuit Breaker Ratings

Option | Panel Breaker | Service Rating | Connector | PDU Breaker
--- | --- | --- | --- | ---
Single Ph. | 30 Amps | 30 Amps | 30 Amps | 30 Amps
Delta | 50 Amps | 50 Amps | 50 A - NEMA 60 A - IEC 309 | 40 Amps
Wye | 30 Amps | 30 Amps | 30 Amps | 30 Amps

Table 4-5 Connector (Europe) Conduit Circuit Breaker Ratings

Option | Panel Breaker | Service Rating | Connector | PDU Breaker
--- | --- | --- | --- | ---
Single Ph. | 30 Amps | 30 Amps | 32 Amps | 30 Amps
Delta | 50 Amps | 50 Amps | 63 Amps | 40 Amps
Wye | 30 Amps | 30 Amps | 32 Amps | 30 Amps

Note: Wire size should be determined by the electrician.

## DC Power

The SL8500 has three DC power grids that supplies 48 VDC to components throughout the library:

- The tape drive power grid supports up to 64 tape drives.

- The robot power grid powers the HandBots and the pass-thru ports.

- The front frame power grid supplies 48 VDC power to the cartridge access ports, elevators, and the service safety door.

### Load Sharing Power Supplies

The DC power grids use load sharing power supplies. Load sharing allows the output voltage of one supply to be monitored and adjusted by other supplies on the bus. In effect, each independent output voltage is adjusted so that all of the independent output voltages are the same to evenly distribute the load. If one output fails or is shorted, it will not bring down the bus.

The two power configurations provide a different number of power supplies for the tape drives and HandBots:

- N+1 allows one power supply for every eight tape drives and one supply for every two HandBots.

- 2N allows one power supply for every four tape drives and one supply for every HandBot.

To order power supplies, see "Power Configurations".

#### Tape Drive Power Supplies

The tables below explain the quantity of load sharing power supplies required for the two power configurations. The total number of power supplies required is determined by the number of tape drives that will be supported in the library.

Table 4-6 Tape Drive Load Sharing Power Supplies

Quantity of Drives to Power | Power Supplies Required for N+1 | Power Supplies Required for 2N
--- | --- | ---
0 - 16 | 3 | 4
17 - 24 | 4 | 6
25 - 32 | 5 | 8
33 - 40 | 6 | 10
41 - 48 | 7 | 12
49 - 56 | 8 | 14
56 - 64 | 9 | 16

#### Robotics Power Supplies

The robotics units in the SL8500 library use the same 1200W DC power supply as the tape drives. The number of DC power supplies required to support the robotics depends on the power configuration selected and whether redundant robotics has be selected.

The N+1 configuration:

- Requires three power supplies for standard robotics

- Requires five power supplies for redundant robotics

The 2N configuration:

- Requires four power supplies for standard robotics

- Requires eight power supplies for redundant robotics

#### Electronics Control Module Power Supplies

The electronic control module (ECM) power supplies are AC to DC converters and different from the load sharing power supplies used by the HandBots and tape drives.

- The N+1 configuration requires two electronic control module (ECM) power supplies.

- The 2N configuration requires four electronic control module (ECM) power supplies.