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1.7.1.1 Typical current profile
Figure 1 shows a projected drive startup and operation current profile for
the Marathon 2250 and the Marathon 1680.
Note.
The peaks in Figure 1 are the result of inductive kickback from
the commutation of the spindle motor and, therefore, do not draw
power from the battery.
1.7.2 Power recovery
Except during execution of a write command or writing cached data, the
drive’s power can be interrupted without adversely affecting the drive or
previously written data. If power is removed while the drive is performing a
write operation, the integrity of the data being written cannot be guaranteed.
Note.
Do not remove power from the drive while the interface signals are ac-
tive (at low impedance) because power may enter the input buffers.
1.7.3 Conducted noise
The drive is expected to operate with a maximum of:
• 150 mV peak-to-peak triangular-wave injected noise at the power
connector. The frequency is 10 Hz to 100 KHz with equivalent resistive
loads.
0
200
400
600
800
1,000
1,200
1,400
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Spinup
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Drive ready
Idle
Standby
mode
mode
Sleep
mode
Active
mode
Current (mA)
Time
(
seconds
)
Figure 1. Typical startup and operation current profile
Marathon 2250 and Marathon 1680 Product Manual 9