Physical/Electrical Specifications; Ac Power Requirements; Dc Power Requirements - Seagate Savvio ST973401LC Product Manual

6.0

Physical/electrical specifications

This section provides information relating to the physical and electrical characteristics of the Savvio SCSI
drive.
6.1

AC power requirements

None.
6.2

DC power requirements

The voltage and current requirements for a single drive are shown in the following table. Values indicated apply
at the drive power connector. The table shows current values in Amperes.
Table 2: DC power requirements
Voltage
Regulation
Average idle current DC
Maximum starting current
(peak DC) DC
(peak AC) AC
Delayed motor start (max) DC
Peak operating current
DC
Maximum DC
Maximum (peak) DC
[1] Measured with average reading DC ammeter or equivalent sampling scope. Instantaneous current peaks
will exceed these values. Power supply at nominal voltage. Number of drives tested = 6, 35 Degrees C
ambient.
[2] For +12 V, a –10% tolerance is permissible during initial start of spindle, and must return to ±5% before
10,000 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.
[3] See +12 V current profile in Figure 2.
[4] This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start
Motor command.
[5] See Section 6.2.1 "Conducted Noise Immunity." Specified voltage tolerance is inclusive of ripple, noise,
and transient response.
Savvio SCSI Product Manual, Rev. C
ST973401
Notes
SE mode
+5 V +12 V
[5] +10%/ +10%/
-7.5% -7.5%[2]
X [1][7] 0.51 0.21
[3]
3 [3] 0.68 1.68
3 1.01 2.70
3 [1][4] 0.49 0.05
[1][6]
X [1] 0.73 0.40
3 0.75 0.46
3 1.12 1.50
LVD mode SE mode
+5 V +12 V +5 V
+10%/ +10%/ +10%/
-7.5% -7.5%[2] -7.5%
0.50 0.21 0.51
0.72 1.68 0.70
1.14 2.65 1.00
0.48 0.05 0.49
0.74 0.43 0.74
0.75 0.49 0.76
1.32 1.54 1.14
ST936701
LVD mode
+12 V +5 V +12 V
+10%/ +10%/ +10%/
-7.5%[2] -7.5% -7.5%[2]
0.19 0.50 0.19
1.58 0.65 1.58
2.68 1.03 2.66
0.05 0.49 0.05
0.46 0.69 0.47
0.49 0.74 0.49
1.48 1.30 1.48
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