Seagate ST410800W/WD, ST410800N/ND manual Elite 9 Installation Guide, Rev. B

Elite 9 Installation Guide, Rev. B 17

1Measured with an average reading DC ammeter. Instan- taneous +12V current peaks will exceed these values.

2A −10% tolerance is permissible during initial start of the spindle but must return to ±5% before reaching 5,400 RPM. The ±5% must be maintained after the drive signifies that its power-up sequence has been completed and that it can accept selection by the host initiator.

3See the +12V current profile in the Elite 9 Product Manual.

4This condition occurs when the Motor Start option is en- abled and the drive has not yet received a start motor command.

5See “Conducted noise immunity” in the Elite 9 Product Manual. The specified voltage tolerance includes ripple, noise, and transient response.

6At power-up, the motor current regulator limits the +12V current to an average value of less than 4.8A, 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 7% of the maximum operating current shown.

8Use separate ground returns for +5V and +12V supplies.

9Where power is provided to multiple drives from a common supply, carefully consider individual drive power require- ments. Where multiple units are powered on simultaneously, be sure the peak starting current is available to each device.

10Operating condition is a third stroke seek at OD and read one track. A command is issued every 100 msec.

11No terminator power. See Section 11.7.3.4 in the Elite 9 Product Manual.

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