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Barracuda 2LP Installation Guide, Rev. E
1
Measured with an average reading DC ammeter. Instanta-
neous +12V current peaks will exceed these values.
A −10% tolerance is permissible during initial start of the
2
spindle but must return to ±5% before reaching 7,200 RPM.
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.
See the +12V current profile in the Barracuda 2LP Product
3
Manual (publication number 83328930).
4
This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
5
See "Conducted noise immunity" in the Barracuda 2LP
Product Manual. The specified voltage tolerance is inclusive
of ripple, noise, and transient response.
At power-up, the motor current regulator limits the +12V
6
current to an average value of less than 1.4A, 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 4% of the maximum operating current shown.
Use separate ground returns for +5 and +12V supplies.
8
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. The command is issued every 0.075 seconds
(every 0.063 seconds on wide and SCA drives).
17
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