Seagate ST410800W/WD - Manual (Page 19)

Elite 9 Installation Guide, Rev. B 17
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