Seagate ST15150N/ND/DC, ST15150W/WD/WC manual Barracuda 4 Installation Guide, Rev. E

Barracuda 4 Installation Guide, Rev. E 17

1Measured with average reading DC ammeter. Instanta- neous +12V current peaks will exceed these values.

2A –10% tolerance is permissible during initial start of spindle and must return to ±5% before 7,200 RPM is reached. The ±5% must be maintained after the drive signifies that its power-up sequence has been completed and that the drive is able to accept selection by the host initiator.

3See the +12V current profile in the Barracuda 4 Product Manual (publication number 83328880).

4This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start Motor command.

5See “Conducted noise immunity” in the Barracuda 4 Product Manual. Specified voltage tolerance is inclusive of ripple, noise, and transient response.

6At power-up, the motor current regulator limits the 12V current to an average value of less than 2.18A, although instantaneous peaks may exceed this value. These peaks should measure 5 msec duration or less.

7Minimum current loading for each supply voltage is not less than 3% of the maximum operating current shown.

8The +5V and +12V supplies employ separate ground returns.

No terminator power. See Section 11.7.3.4 in the Barra- cuda 4 Product Manual.

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