Seagate Elite 47 Installation Manual page 18

16
Table 2: DC power requirements
Voltage regulation
Maximum starting current
3, 6, 9
Peak DC
Delayed motor start (max)
Peak operating current
Typical DC
Maximum (peak)
1
Measured with an average reading DC ammeter. Instanta-
neous +12V current peaks will exceed these values.
2
A –10% tolerance is permissible during initial start of the spin-
dle but must return to ±5% before reaching 5,357 r/min. 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.
3
See the +12V current profile in the Elite 47 Product Manual
(publication number 83329280).
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 Elite 47 Product Man-
ual. The specified voltage tolerance is inclusive of ripple,
noise, and transient response.
6
At power-up, the motor current regulator limits the +12V cur-
rent to an average value of less than 4.8A, although instanta-
5
1, 4
1
7
Elite 47 Installation Guide, Rev. B
Single-ended
,
8 10
+5V +12V
± 5% ± 5%
Amps
1.0 4.8
.85 .1
.98 1.6
1.1 2.8
8
2