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Hawk 2XL Product Manual, Rev. B
6.0
Physical/electrical specifications
6.1
AC power requirements
Not applicable to this drive.
6.2
DC power requirements
The voltage and current requirements for a single drive are shown in the following table. Values indicated apply
at the drive power connector. The single ended power requirements includes the internal disc drive SCSI I/O
termination.1
Table 2:
DC power requirements
Voltage
Regulation [4] [2]
Average Idle Current [1]
Maximum Starting Current (Peak)[2]
Delayed Motor Start (Max) [3]
Operating Current [5]
Typ. [1]
Max. [1]
Max. (Peak)
[1]
Measured with average reading DC ammeter. Instantaneous current peaks will exceed these values.
[2]
A droop of up to -10% is permissible during the T2 portion of +12 V power up (see Figure 3).
[3]
This condition occurs when the Motor Start Option is enabled and the drive has not yet received a Start
Motor command.
[4]
See Section 6.2.1 "Conducted Noise Immunity".
[5]
Instantaneous peaks less than 5 msec in duration are allowed.
General Notes from Table 2:
1. At power-up, the motor current regulator limits the 12 volt current to a peak value of less than 1.8 amperes,
although instantaneous peaks may occur as stated in [5] above.
2. Operating condition is defined as random seek read of 64 blocks.
3. Minimum operating current loading for each supply voltage is not less than 38% of the maximum operating
current shown.
4. The +5 and +12 volt supplies shall employ separate ground returns. Where power is provided to multiple
drives from a common supply, careful consideration for individual drive power requirements should be
noted. Where multiple units are powered on simultaneously, the peak starting current must be available to
each device.
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 power con-
nector.
+5 V =
150 mV pp from 0 to 50 kHz and 45 mA pp from 50 kHz to 10 MHz.
+12 V =
150 mV pp from 0 to 50 kHz and 60 mA pp from 50 kHz to 10 MHz.
ST32151/ST32155
+5 V
+12 V
±5%
±5%
0.32 A
0.34 A
0.57 A
1.8 A
0.52 A
0.22 A
0.65 A
0.40 A
0.69 A
0.42 A
1.0 A
1.8 A
ST31051/ST31055
+5 V
+12 V
±5%
±5%
0.32 A
0.34 A
0.57 A
1.8 A
0.52 A
0.22 A
0.65 A
0.40 A
0.69 A
0.42 A
1.0 A
1.8 A
19
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