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6.2.2
Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up
and down. Daisy-chain operation requires that power be maintained on the terminated drive to ensure proper
termination of the peripheral I/O cables. For the benefit of the system power supply, the drive power-up can be
delayed using the motor start delay option.
6.2.3
Current profile
Figure 3 identifies the drive +5 V and +12 V current profile. The current during the various times is as shown:
T -
Power is applied to the drive.
T1 -
Controller self tests are performed.
T2 -
Spindle begins to accelerate under current limiting after performing drive internal
diagnostics. See Note 1 of Table 2.
T3 -
The heads move from the landing zone to the data area.
T4 -
The adaptive servo calibration sequence is performed.
T5 -
Calibration is complete and the drive is ready for reading and writing.
Note.
All times and currents are typical. See Table 2 for maximum current requirements.
.6
.4
5V
Current
(amps)
.2
T
0
1.6
1.4
1.2
1.0
12V
Current
(amps)
.8
.6
.4
.2
T
0
0
Figure 3.
Typical Hawk 2XL family drive +5 V and +12 V current profile
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T1
T2
2
4
6
8
Hawk 2XL Product Manual, Rev. B
T3
T4
T5
10
12
14
16
Seconds
T6
18
20
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