Seagate BARRACUDA 4 FAMILY ST15150W/WD/WC - Handbuch (Seite 19)

Barracuda 4 Installation Guide, Rev. E 17
1 1 Measured with average reading DC ammeter. Instanta-
neous +12V current peaks will exceed these values.
1 2 A –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.
1 3 See the +12V current profile in the Barracuda 4 Product
Manual (publication number 83328880).
1 4 This condition occurs when the Motor Start Option is
enabled and the drive has not yet received a Start Motor
command.
1 5 See “Conducted noise immunity” in the Barracuda 4
Product Manual. Specified voltage tolerance is inclusive
of ripple, noise, and transient response.
1 6 At 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.
1 7 Minimum current loading for each supply voltage is not
less than 3% of the maximum operating current shown.
1 8 The +5V and +12V supplies employ separate ground
returns.
No terminator power. See Section 11.7.3.4 in the Barra-
cuda 4 Product Manual.
continued