Seagate ST12450W, Руководство по эксплуатации продукта

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ST12450W/WD Product Manual, Rev. A 27
7.0 Physical/electrical specifications
This section provides information relating to the physical and electrical
characteristics of Barracuda 2, 2HP drives.
7.1 AC power requirements
None.
7.2 DC power requirements
The voltage and current requirements for a single drive are shown below.
Values indicated apply at the drive’s power connector.
Table 1. DC power requirements
ST12450W ST12450WD
Voltage 5V
[8]
12V 5V
[8]
12V
regulation
[5]
Notes
±±±±±
5%
±±±±±
5%
[2]
±±±±±
5%
±±±±±
5%
[2]
Max operating current [1] tbd tbd 1.65A 0.89A
Avg idle current [1] [9] tbd tbd 1.2A 0.72A
Max start current
(peak) DC [3] [6] tbd tbd 1.43A 2.18A
(peak) AC [3] tbd tbd — 3.1A
Delay motor start (max) [1] [4] tbd tbd 1.31A 0.13A
Peak operating current
Typical [1] [7] tbd tbd 1.6A 0.83A
Maximum [1] tbd tbd 1.65A 0.89A
Maximum (peak) AC tbd tbd 2.5A 1.83A
Track following at
OD DC [1] tbd tbd 1.4A 0.74A
ID DC [1] tbd tbd 1.4A 0.8A
Read track
OD DC [1] [14] tbd tbd 1.9A 0.76A
AC tbd tbd 2.5A 1.1A
Seeking
Typical [1] [13] tbd tbd 1.4A 1.04A
Maximum [1] tbd tbd 1.44A 1.1A
Maximum (peak) AC tbd tbd 2.3A 1.83A
Notes:
[1] Measured with average rea ding DC ammeter. Instantaneous
+
12V cur-
rent peaks will exceed these values.
[2] A –10% tolerance is permissible during initial start of the spindle and must
return to
±
5% before 7,200 RPM is reached. The
±
5% must be maintained
after the drive signals that its power-up sequence has been completed
and that it can accept selection by the host initiator.
[3] See Figure 10.
[4] This condition occurs when the M otor Start Option i s enabled and th e
drive has not yet received a Start Motor command.
[5] See Section 7.2.1 “Conducted noise immunity.” Specified voltage toler-
ance includes ripple, noise, and transient response.
continued