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Barracuda 4LP Installation Guide, Rev. B
Table 2b. DC power requirements (Amps)
Voltage
Regulation [5]
Max. operating current
DC3 [1]
Avg. idle current DCX [1]
Max. starting current
(peak DC) DC3 [3]
(peak AC) AC3 [3]
Delayed motor start (max)
DC3 [1][4]
Peak operating current
Typical DCX [1] [6]
Maximum DC3 [1]
Maximum (peak) 3
[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 4LP Product
Manual (publication number 77767491).
[4] This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
ST32171/ST32271
N/W/WC
Single-ended
+5V
+12V
±5%
±5% [2]
0.81
0.85
0.46
0.52
0.78
2.00
3.1
0.50
0.20
0.72
0.73
0.81
0.85
1.5
2.3
15
WD/DC
Differential
+5V
+12V
±5%
±5%[2]
1.21
0.85
0.70
0.52
1.1
2.00
3.1
0.90
0.20
0.91
0.73
1.21
0.85
2.0
2.3
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