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6.2.1
Conducted noise immunity
Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 MHz.
Maximum allowed noise values given below are peak-to-peak measurements and apply at the drive connector.
+5V
0 to 100 kHz
150mV
100 kHz to 10 MHz
100mV
6.2.2
Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up
and down.
6.2.3
Current profiles
Figure 3 identifies the drive +12V current profile. The current during the various times is as shown:
4.0
3.5
3.0
2.5
2.0
+12V
1.5
Current
(amps)
1.0
0.5
0.0
Figure 3.
Typical Barracuda 18FC drive +12V current profile
T0
Power is applied to the drive.
T1
Controller self-tests are performed.
T2
Spindle begins to accelerate under current limiting after performing internal diagnostics.
T3
Spindle is up to speed and the head and arm restraint is unlocked.
Note: All times and currents are typical. See Table 1 for maximum current requirements.
6.3
Power dissipation
Typical seek power dissipation is 23.3 watts (79.4 BTUs per hour) of DC power average at nominal voltages.
Typical power dissipation under idle conditions is 17.1 watts (58.4 BTUs per hour).
+12V (with spindle motor not running)
150mV
100mV
AC
Component
Nominal (average) DC curve
T1
T2
T3
T
0.0
4
8
12
Barracuda 18FC Product Manual, Rev. B
T4
16
20
24
28
TIME (seconds)
T5
32
36
40
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