Seagate Elite 9 Installation Manual page 19

Elite 9 Installation Guide, Rev. B
1
Measured with an average reading DC ammeter. Instan-
taneous +12V current peaks will exceed these values.
2
A 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.
3
See the 12V current profile in the Elite 9 Product Manual .
4
This condition occurs when the Motor Start option is en-
abled and the drive has not yet received a start motor
command.
5
See "Conducted noise immunity" in the Elite 9 Product
Manual. The specified voltage tolerance includes ripple,
noise, and transient response.
6
At 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.
7
Minimum current loading for each supply voltage is not less
than 7% of the maximum operating current shown.
8
Use separate ground returns for +5V and +12V supplies.
9
Where 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.
10
Operating condition is a third stroke seek at OD and read
one track. A command is issued every 100 msec.
11
No terminator power. See Section 11.7.3.4 in the Elite 9
Product Manual.
continued
17