Barracuda 18LP Installation Guide, Rev. B
17
Table 2.
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 18LP Product
Manual
(publication number 77767526).
[4] This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
ST39175LW/LC
ST318275LW/LC
Voltage
+5V
+12V
+5V
+12V
Regulation [5]
±5%
±5%[2]
±5%
±5%[2]
Avg. idle current
DCX [1]
0.75
0.35
0.75
0.5
Max. starting current
(peak DC) [3]
(peak AC) [3]
1.0
—
1.3
2.4
1.05
—
1.6
2.4
Delayed motor
start (max) [1][4]
0.65
0.05
0.65
0.05
Peak operating current
Typical DCX [1] [6]
Maximum DC
[1]
Maximum (peak)
1.0
1.3
1.7
0.7
1.4
2.1
1.05
1.4
1.7
0.8
1.5
2.4
