Table 13, Power requirements — scsi interface – Quantum Audio Tape Drives A-Series User Manual
Page 56
Functional Specifications
Quantum A-Series Tape Drives User’s Guide
40
Table 13 Power Requirements
— SCSI Interface
Mode
DC Power
MaxPk
1
Typ
2
AC Power (W)
Max
3
Typ
4
Standby/Idle
21
21
51
46
Media Loading/Unloading
43
37
83
73
600A Write – Motor Start
5
32
29
78
71
600A Write – Streaming
32
31
73
64
Max for SDLT 600A tape drive Modes
6
43
N/A
83
N/A
1.
The Max-Peak value represents short current spikes drawn for durations of < 50ms. On the 12V supply, the
peaks correspond to the pulse-width-modulated switching of the motors. These values are calculated from the
average of Peak-ripple-current + 2 sigma, measured at nominal DC voltage.
2.
The typical current is calculated from the average of all RMS current drawn during this operating mode,
measured at nominal DC voltage.
3.
The Max AC power is calculated from the typical AC power in tabletop tape drives + 3 sigma.
4.
The Typical AC power is calculated from the average of AC power drawn in tabletop tape drives.
5.
These events last < 1 second and occur at a duty cycle of less than 25%.
6.
The Max values for each mode are based on the Max-Mean values, since the peak values are of very short
duration.
(Common Notes)
(1) Voltage tolerance: 5V ±5%, 12V ±5%; Room temperature 24 °C. AC power measured at 117 V, 60 Hz.
(2) DC Current, MaxMean, and DC/AC Power Max refer to the statistically calculated maximum average
requirement based on a sample population of tape drives. These values do not reflect the peak current or power
requirement; this amount is given by the DC MaxPk current.
(3) These results were from the DVT data taken by Percept Technology. Reference the “Power Consumption &
Characterization Test Report” dated 11/28/2005.
(4) Test data set included 12 measurements: 3 measurements of 4 drives.
(5) The 5V “MaxPK” calculated to less than MaxRMS, which does not at first glance make sense. (MaxPK is
calculated at 5.25V, and the switching power supplies need less input current to the same input current.)
Instead, the MaxRMS value was substituted.