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Barracuda 18 Installation Guide, Rev. C
Table 2c.
DC power requirements (Amps), multimode
(SE/LVD)
Voltage
Regulation [5]
Max. operating current
DC [1]
Avg. idle current
DCX [1]
Max. starting current
(peak DC) [3]
(peak AC) [3]
Delayed motor
start (max) [1][4]
Peak operating current
Typical DCX [1] [6]
Maximum DC [1]
Maximum (peak)
[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 18 Product
Manual (publication number 77767512).
[4] This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
ST118273LW/LC
+5V
+12V
±5%
±5%[2]
1.4
1.35
0.75
0.8
1.2
2.8
—
4.2
0.65
0.06
1.2
1.3
1.4
1.35
1.7
3.15
19
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