Seagate ST336807FC manual Physical/electrical specifications, AC power requirements

6.0Physical/electrical specifications

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

6.1AC power requirements

None.

6.2DC power requirements

The voltage and current requirements for a single drive are shown below. Values indicated apply at the drive connector.

Table 11: ST336807FC DC power requirements

					ST336807FC
					1 Gbit		2 Gbit
				Notes	(Amps)	(Amps)	(Amps)	(Amps)
Voltage					+5V	+12V [2]	+5V	+12V [2]
Regulation				[5]	±5%	±5% [2]	±5%	±5% [2]
Avg idle current DC				[1] [7]	0.86	0.34	0.92	0.34
		X
Maximum starting current
(peak DC) DC	3σ			[3]	1.02	1.58	1.08	1.57
(peak AC) AC	3σ			[3]	1.18	3.48	1.50	3.57
Delayed motor start (max) DC	3σ			[1] [4]	0.60	0.09	0.62	0.09
Peak operating current:
Typical DC				[1] [6]	0.93	0.77	0.99	0.80
			X
Maximum DC	3σ			[1]	0.94	0.78	1.00	0.81
Maximum (peak) DC	3σ				1.78	2.44	1.86	2.50

[1]Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these val- ues. Power supply at nominal voltage. Number of drives tested = 6, 35 Degrees C ambient.

[2]For +12 V, a –10% tolerance is allowed during initial spindle start 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 +12V 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.

Cheetah 10K.7 36GB FC Product Manual, Rev. A 25