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Barracuda 9LP Installation Guide, Rev. E 19
Table 2c. DC power requirements (Amps), multimode
(SE/LVD)
[1] Measured with an average reading DC ammeter. Instanta-
neous +12V current peaks will exceed these values.
[2] A –10% droop is permissible during initial start of the spindle
but must return to ±5% before reaching 7,200 RPM. The
±5% must be maintained after the drive signifies that its
power-up sequence has been completed and that the drive is
able to accept selection by the host initiator.
[3] See the +12V current profile in the
Barracuda 9LP Product
Manual
(publication number 77767517).
[4] This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
ST39173LW/LC ST34573LW/LC
Voltage +5V +12V +5V +12V
Regulation [5] ±5% ±5%[2] ±5% ±5%[2]
Max. operating current
DC [1] 1.4 0.95 1.4 0.95
Avg. idle current
DCX
[1] 0.75 0.5 0.75 0.5
Max. starting current
(peak DC) [3]
(peak AC) [3]
1.2
—
1.7
2.9
1.2
—
1.7
2.9
Delayed motor
start (max) [1][4] 0.65 0.06 0.65 0.06
Peak operating current
Typical DCX
[1][6]
Maximum DC [1]
Maximum (peak)
1.2
1.4
1.7
0.9
0.95
2.4
1.2
1.4
1.7
0.9
0.95
2.4