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Barracuda ES.2 FC Product Manual, Rev. B

23

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

None.

The voltage and current requirements for a single drive are shown below. Values indicated apply at the drive 
connector. Notes are shown following table 2.     

[1]

Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these val-
ues. Power supply at nominal voltage. N (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 profiles in Figure 1.

[4]

This condition occurs when the Motor Start option is enabled and the drive has not yet received a Start 
Motor command. 

[5]

See paragraph 6.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and 
transient response.

[6]

During idle, the drive heads are relocated every 60 seconds to a random location within the band from 

Voltage

+5V

+12V [2]

Regulation

[5]

±5%

±5% [2]

Avg idle current DCX

[1] [6]

0.75

0.50

Maximum starting current

(peak DC) DC

3

σ

[3]

1.00

2.00

(peak AC) AC

3

σ

[3]

1.15

3.23

Delayed motor start (max) DC

3

σ

[1] [4]

0.65

0.04

Peak operating current:

     Typical DCX

[1]

0.69

0.77

     Maximum DC

3

σ

[1]

0.71

0.82

     Maximum (peak) DC

3

σ

1.13

1.67