20 Hawk 2XL Product Manual, Rev. B
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:
Note. All times and currents are typical. See Table 2 for maximum current requirements.
Figure 3. Typical Hawk 2XL family drive +5 V and +12 V current profile
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.
0246810
Seconds
12 14 16 18
.2
0
.4
.6
1.4
1.6
12V
Current
(amps)
.8
1.0
1.2
T1
T
T2
T5 T6
20
T3
T4
.2
0
.4
.6
5V
Current
(amps)
T
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