Seagate Cheetah 4LP Installation Manual page 20

18
Table 2. DC power requirements (Amps)
Voltage regulation
Max. start current
3, 6, 9
Peak DC
Delayed motor start
1, 4
(max)
Peak operating current
Typical DC
Maximum DC
Maximum (peak) AC
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 10,000 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.
3
See the +12V current profile in the Cheetah 4LP Product Man-
ual (publication number 83329120).
4
This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
Cheetah 4LP Installation Guide, Rev. B
ST34501
N, W, WC models WD, DC models
+5V
5
± 5%
0.88
0.81
1
0.85
1
0.9
7
1.0
8, 10 8
+12V
2
± 5%
2.2
0.08
0.89
0.94
1.98
8
+5V +12V
± 5% ± 5%
0.89 2.2
0.72 0.08
1.05 0.89
1.09 0.94
— 1.98
8
2